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  • Electronic Resource  (3,161)
  • 1965-1969  (3,161)
  • Organic Chemistry  (3,129)
  • Engineering General
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  • Electronic Resource  (3,161)
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  • 1
    Electronic Resource
    Electronic Resource
    Masthead (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969) 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010101
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  • 2
    Electronic Resource
    Electronic Resource
    Basis of finite element methods for solid continua (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 3-28 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Finite element methods can be formulated from the variational principles in solid mechanics by relaxing the continuity requirements along the interelement boundaries. The combination of different variational principles and different boundary continuity conditions yields numerous types of approximate methods. This paper reviews and reinterprets the existing finite element methods and indicates other alternative schemes. Plate bending problems are used to compare the relative merits of the various methods.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010103
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  • 3
    Electronic Resource
    Electronic Resource
    Editorial (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 1-2 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010102
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  • 4
    Electronic Resource
    Electronic Resource
    Transmission of vibration in beam systems (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 47-66 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Three methods for finding natural frequencies and modes of complex structures composed of beam elements are described and compared. The analysis is extended to include hysteretic damping for the determination of response and transmissibility without a modal analysis. Experimental comparison is given for the response of a simple engineering structure.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010105
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  • 5
    Electronic Resource
    Electronic Resource
    A refined triangular plate bending finite element (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 101-122 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The derivation of the stiffness matrix for a refined, fully compatible triangular plate bending finite element is presented. The Kirchhoff plate bending theory is assumed. Six parameters or degrees of freedom are introduced at each of the three corner nodes resulting in an 18 degree of freedom element. This refined element is found to give better results for displacements and particularly for internal moments than any plate bending element, regardless of shape, previously reported in the literature.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010108
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical treatment of mixed boundary value problems in two-dimensional elastostatics (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 67-73 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Finite difference treatment of two-dimensional problems in elastostatics is usually based on the differential equations for the displacement vector or the Airy stress function, depending on whether boundary conditions are on displacement or stress. In either case, determination of stresses requires numerical differentiation and therefore use of a rather fine grid. Moreover, neither method is suited to the treatment of mixed boundary conditions. The alternative method developed in this paper uses the first derivatives of the displacement components at the grid points as basic variables and hence does not require numerical differentiation in the evaluation of stresses. Appropriate finite difference equations are established, and their use is discussed in connection with a specific example with known explicit solution.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010106
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  • 7
    Electronic Resource
    Electronic Resource
    A conforming quartic triangular element for plate bending (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 29-45 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The theory, function generator routine and testing procedures are given for a six-node 18 degree of freedom triangular element. At corner nodes the variables are the displacement and the two slopes. At midside nodes the variables are the displacement, the slope normal to the side, and the rate of change of this along the side - i.e., the rate of torsion. Of two options, one divides the triangle into three and takes different quartic displacements in the three regions, and the other uses displacement functions with singularities at the vertices. According to a test which compares the energies of the two formulations by eigenvalues, the second is the better if the integration is accurate. The same test, together with others based on finite differences and on nodal values, etc. checks the correctness of the routine decisively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010104
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of large deflection of plates by the finite element method (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 123-133 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The large deflection problem of a rectangular plate is analysed by using the finite element method and employing the iteration technique. In the present study, the stiffness matrix of a rectangular plate element for bending proposed by Greene is employed, and results of numerical examples duly justifies applicability of the present method.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010109
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  • 9
    Electronic Resource
    Electronic Resource
    Elasto-plastic solutions of engineering problems ‘initial stress’, finite element approach (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 75-100 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The paper presents first a general formulation of the elasto-plastic matrix for evaluating stress increments from those of stresses for any yield surface with an associated flow rule. A new ‘initial stress’ computational process is proposed which is shown (1) to yield more rapid convergence than alternative approaches (2) to permit large load increments without violating the yield criteria and thus simply to establish lower bound solutions. Several solutions showing stress distribution, strain development and growth of plastic enclaves are given both for the von Mises and for Coulomb (Drucker) type yield surfaces. Load reversal and thermoplastic behaviour are dealt with.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010107
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  • 10
    Electronic Resource
    Electronic Resource
    Masthead (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969) 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010201
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  • 11
    Electronic Resource
    Electronic Resource
    The damped transient behaviour of finite beams and plates (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 151-162 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The direct Finite Element Analysis which was successfully employed in the solution of dynamic flexural traveling wave problems is extended herein to provide the transient behaviour of finite beams and plates in which shear deformation and rotatory inertia are considered. The particle and angular velocities are exponentially damped so that the static solutions for these problems are obtained with the same analysis which provided the dynamic and transient cases. Three special cases are chosen as examples. In the first, a sinusoidally varying shear force is applied at the tip of a cantilever beam. The resonant characteristics of this beam for both the undamped and damped cases are studied. In the second, a step shear loading is applied to a cantilever beam and its damped dynamic history is studied. Finally, a circular plate whose outer edge is simply supported is impacted at its inner edge by a step moment and its damped transient behaviour is determined. The idea of the methods is potentially applicable to dynamic problems in general.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010203
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  • 12
    Electronic Resource
    Electronic Resource
    A polygonal finite element for plate bending problems using the assumed stress approach (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 135-149 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The assumed stress distribution approach is used to derive the stiffness matrix of a plate-bending element of general polygonal shape having any number of nodes. The effect of assuming various numbers of unknown coefficients in the stress distributions is examined and the convergence properties of the resulting elements compared with others derived form assumed displacements.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010202
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  • 13
    Electronic Resource
    Electronic Resource
    Numerical solution and utilization of Green's functions (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 169-175 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A numerical method for obtaining the Green's functions for Laplace's, Poisson's, and the transient heat diffusion equations is presented. The Green's functions thus obtained are then employed to rapidly obtain numerical solutions of the above equations by matrix multiplication, with subsequent considerable savings in machine time.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010205
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  • 14
    Electronic Resource
    Electronic Resource
    A method of solution for non-linear simultaneous algebraic equations (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 177-180 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The solution of the large numbers of non-linear algebraic equations occurring in analyses of non-linear structural systems using finite differences or finite elements is time consuming even for the fastest computers. This paper presents a method of solution based on a Taylor's expansion technique which is an aid in the solution of such systems of equations.Examples presented show that in the finite element analysis of moderately non-linear structural systems the technique provides sufficiently accurate solutions. For more non-linear systems the technique provides excellent starting values for the Newton-Raphson method.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010206
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  • 15
    Electronic Resource
    Electronic Resource
    Improved deformation functions for the finite element anlysis of beam systems (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 163-167 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Deformation functions which, in addition to satisfying the continuity conditions at nodes. Also satisfy. Approximately, the governing differential equation within the element allow system eigenvalues to be found more accurately, with a given number of elements, than is possible with previously published deformation functions. This is illustrated for the case of beams.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010204
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  • 16
    Electronic Resource
    Electronic Resource
    Economical computer techniques for numerically integrated finite elements (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 201-203 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010208
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  • 17
    Electronic Resource
    Electronic Resource
    A general theory of finite elements. I. Topological considerations (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 205-221 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents a general theory of finite elements. The concept of finite elements is cast in a general topological framework valid for spaces of finite dimension. It is shown that the idea of finite element models can be developed in higher-dimensional spaces, independent of specific co-ordinate systems, for any type of continuous abstract function defined on the space. Generalizations of the familiar Lagrange and Hermite interpolation functions are presented as well as a general statement of the notion of generalized variables and conjugate fields. It is also shown that admissible finite elements can be developed for non-Euclidean spaces of finite dimension. Topological properties of finite element models are examined in Part I of the paper. Part II is devoted to certain applications.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010209
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  • 18
    Electronic Resource
    Electronic Resource
    Announcement (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 224-224 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010302
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  • 19
    Electronic Resource
    Electronic Resource
    Masthead (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969) 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010301
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  • 20
    Electronic Resource
    Electronic Resource
    A matrix for the solution of mixed rotating and non-rotating vibration systems (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 225-245 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A method is presented based on matrix algebra for the dynamic analysis of a mixed rotating and non-rotating vibration system. Such systems occur in practice when turbo-alternator sets are mounted on flexible steel foundations.The mathematical model considered consists of a rotating non-uniform, bi-symmetric shaft connected via three or more flexible-film bearings to a flexible structure throughout which mass is distributed. The shaft, which is assumed to rotate at constant speed, is heavy, flexible and carries several rigid axi-symmetric discs. Viscous damping is assumed to act in all parts of the system and gravitational effects are ignored.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010303
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  • 21
    Electronic Resource
    Electronic Resource
    End displacements of semi-infinite cylinders due to annular loadings (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 181-200 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Surface displacements at the end of a semi-infinite, circular cylinder due to an axisymmetric ring of forces on the end are examined. The solution which has been found may then be used to find surface displacements for general axisymmetric loadings by convolution. The solution, in tabular form, is given as corrections to the counter-part half-space solution.The method of solution involves a three step superposition process. First, the displacement due to a ring of forces on a half-space is found by using the Boussinesq solution. Then, the excess tractions on the half-space, over that of the cylinder, are removed. This is done in two parts. The problem of an infinite cylinder with linearly varying pressure and shear over a short length of the lateral surface is solved by using Fourier integrals. This is used for the removal of the pressure and shear on the lateral surface of the cylinder by convolution. Next, the stresses at the mid-section of the infinite cylinder are removed. This is done by finding a set of boundary conditions for the end which yields zero tractions on the lateral surface. Then a series of these boundary conditions is used to approximate the tractions which must be removed.With the solution thus obtained, two sample problems are shown: 1. an elastic cylinder in contact with a half-space; 2. a rigid punch in contact with an elastic cylinder.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010207
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  • 22
    Electronic Resource
    Electronic Resource
    A general theory of finite elements. II. Applications (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 247-259 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In Part I of the this paper, topological properties of finite element models of functions defined on spaces of finite dimension were examined. In this part, a number of applications of the general theory are presented. These include the generation of finite element models in the time domain and certain problems in wave propagation, kinetic theory of gases, non-linear partial differential equations, non-linear continuum mechanics, and fluid dynamics.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010304
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  • 23
    Electronic Resource
    Electronic Resource
    A version of the Aitken accelerator for computer iteration (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 275-277 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010306
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  • 24
    Electronic Resource
    Electronic Resource
    A rectangular plate bending element the use of which is equivalent to the use of the finite difference method (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 261-274 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A presentation is made of a rectangular plate bending element, the use of which corresponds to the finite difference method. The element stiffness matrix is arrived at by approximation of the strain energy of the element by suitably selected finite difference expressions which contain not only values in respect of the deflection, but also values of its first derivatives. On the basis of the connection found between the two methods, some changes are suggested in the finite difference method, which involve a more realistic way of considering the detailed distribution of the loading. The effect of these modifications is illustrated in two applications.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010305
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  • 25
    Electronic Resource
    Electronic Resource
    A theory of the solution of steady state network problems with special reference to mine ventilation networks (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 279-299 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: When calculating complex interconnected systems (electrical, power, water supply, gas systems, etc.) by digital computer, a number of common problems arise, connected both with the mathematically correct formulation of the problem under investigation, and with the algorithms of the solution, the programming of which makes it possible to reduce the computing time, the store capacity and the volume of input data required. The present article is devoted to the solution of these problems. The procedure is illustrated by formulating and manipulating the equations relating to complex interconnected mine ventilation networks.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010307
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  • 26
    Electronic Resource
    Electronic Resource
    Masthead (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969) 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010401
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  • 27
    Electronic Resource
    Electronic Resource
    Derivation of stiffness matrices for problems in plane elasticity by Galerkin's method (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 301-310 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Solution of plane elastic problems by piecewise linear approximation is outlined. This method is based upon Galerkin error distribution technique, which leads to simultaneous algebraic equations identical to those associated with the Finite Element Method. In addition, this method permits definition of the discretization error, which can be computed once the displacement components are known. Properties of the interpolation functions are discussed, and a sequence of internally compatible plane elastic elements is defined.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010308
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  • 28
    Electronic Resource
    Electronic Resource
    Minimum weight design of structures with application to elastic grillages (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 311-331 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A review is given of some mathematical programming methods suitable for optimization of structures needing matrix methods for analysis. An application is presented for elastic flat grillages made of straight orthogonal beams normally loaded. Empirical relationships are used to relate beam section properties so that each beam element has only one design variable. Optimization results are obtained by methods of stress-ratio, linear programming-cutting plane and usable-feasible gradient directions. A comparison of the efficiency of these methods is given for the grillage designs which are shown to have non-convex stress constraints and numerous relative optima. Instances are given of non-fully stressed global optima and fully stressed designs which are not local optima for cases with only stress constraints. Discussions include locating the global optima for grillage designs and extensions of the methods presented to other structural design problems.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010402
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  • 29
    Electronic Resource
    Electronic Resource
    Mass condensation : A semi-automatic method for reducing the size of vibration problems (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 333-349 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The paper presents a method for reducing the size of a vibration analysis by generating an inertia matrix referred to a limited set of ‘master’ vibrational freedoms. In designing a computer program to perform this mass condensation process, the emphasis has been on providing a two way interface between structural analysis and vibration analysis programs. The transformation from the full set of degrees of freedom to the master set makes extensive vibration calculations economically feasible giving solutions in terms of the amplitudes of the master freedoms. However, by reversing the transformation after completion of a vibration analysis, it is possible to restore the full set of freedoms, allowing automatic plotting of mode shapes in full detail, and re-entry to the structural analysis program for the purpose of computing dynamic stresses.A worked example is given. This is a realistic machine tool structure rather than the simple plates or beams which are usually used for illustration purposes. Natural frequencies and mode shapes, calculated with various degrees of condensation, are compared with those obtained by using all possible freedoms. A comparison is also made with an intuitive selection of ‘lumped masses’.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010403
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  • 30
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    Application of non-linear programming to optimum grillage design with non-convex sets of variables (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 351-378 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The application of non-linear programming methods for the optimum design of statically indeterminate structures is discussed, with special emphasis on the design of elastic grillages loaded laterally and in plane. Some features of SUMT (sequential unconstrained minimization technique) are demonstrated by means of numerous examples of varying complexity. The Variable Metric method of search is discussed and compared to Powell's Direct Method. It is shown that non-convex sets of design variables are often encountered in structural problems of the grillage type. SUMT may still be used, but the choice of starting value and initial response factor decisively influences the chance of finding the global optimum.It is demonstrated that a fully stressed design may not necessarily correspond to the minimum weight design. Optimum design of grillages which are simultaneously subjected to lateral and in-plane loads may be performed efficiently by means of non-linear programming.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010404
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  • 31
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    A finite element method of viscoelastic stress analysis with application to rolling contact problems (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 379-394 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A completely numerical method for steady state linear viscoelastic stress analysis is presented by means of the finite element approach. Numerical representations of the measured viscoelastic constitutive relations are used. This method is developed to obtain steady state solutions to mixed boundary value problems in which the character of the boundary conditions at a point changes with time. Such problems cannot be handled by direct application of the correspondence theorem. A numerical example of viscoelastic sheet rolling is presented along with an experimental verification of the solution by photo-viscoelastic observations.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010405
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  • 32
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    Letters to editor (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 395-395 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010406
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  • 33
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    An unsere verehrten Autoren und Leser des Journals für praktische Chemie (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 1-2 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110102
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  • 34
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    Peptide. VII. Synthese eines weiteren Pentapeptids mit modifizierter potentieller Circulin B-Sequenz (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 3-8 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Synthese des geschützten Pentapeptids Boc - Orn(MOA)-Thr - Orn(Z) - Thr - Orn(Z) - OMe [3] beschrieben. Dazu wurden die beiden Dipeptide Boc - Thr - Orn(Z) - OH und Thr - Orn(Z) - OMe nach der Carbodiimid- und Azid-Methode zum Tetrapeptid gekuppelt und dieses mit Boc - Orn(MOA) - ONP zum Pentapeptid umgesetzt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110103
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    Masthead (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969) 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110101
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  • 36
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    Relaissynthesen von Heterocyclen. IV. Darstellung von 4-Alkylamino-1,2,4-triazolen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 9-14 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die aus 4-Amino-1,2,4-triazol bzw. 3,5-Dimethyl-4-amino-1,2,4-triazol erhältlichen 1-Al-kyl-4-amino- bzw. 1-Alkyl-3,5-dimethyl-4-amino-triazolium-Salze gehen beim Erhitzen mit verdünnter Natronlauge durch Ringspaltung, Wanderung der gebildeten Acylgruppe und erneuten Ringschluß in die entsprechenden 4-Alkylamino-1,2,4-triazole über, deren Struktur bewiesen wird.Die Acylwanderung verläuft intermolekular, wie sich aus dem Kreuzungsexperiment ergibt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110104
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  • 37
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    Dreikomponentenreaktionen. I. Halogenierung von Olefinen in Gegenwart organischer Cyanverbindungen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 15-35 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der elektrophilen Halogenierung von Olefinen in Gegenwart organischer Cyanverbindungen, wie RCN, RSCN, R2NCN, CICN und ROCN werden neben den 1,2-Dihalogenalkanen N-(β-Haloalkyl)-imidhalogenide erhalten, die bei Hydrolyse die entsprechenden Amide ergeben. So sind N-(β-Haloalkyl)-amide, N-(β-Haloalkyl)-thiolurethane, N-(β-Haloalkyl)-N′,N′-dialkylharnstoffe und N-(β-Haloalkyl)-urethane zugänglich.Die primär entstehenden Verbindungen mit Imidhalogenidstruktur sind teils zersetzliche, teils in Substanz isolierbare Verbindungen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110105
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  • 38
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    Zur Darstellung einiger Brom-pyrazin-derivate (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 40-44 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Amino-3-halogen-pyrazine werden mit Brom in Bromwasserstoffsäure leicht bromiert. Der Eintritt des Broms erfolgt in 5-Stellung. Die Darstellung von 2,3,5-Trihalogen- sowie 2,5-Dihalogen-3-hydroxy-pyrazinen aus 2-Amino-3,5-dihalogen-pyrazinen wird beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110107
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  • 39
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    Organische Schwefelverbindungen. 98. Zur Chemie des 4,6-Diphenyl-2H-thiopyranthions-(2) (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 61-70 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 4,6-Diphenyl-2H-thiopyranthion-(2) 1, ist am Thionschwefel zu Thiopyryliumsalzen des Typs 2, alkylierbar und acylierbar. Bei der Umsetzung von Oxalylhalogeniden mit 1, oder 4,6-Diphenyl-2H-thiopyranon-(2) 4 fragmentiert das Acylierungsprodukt A zu den reaktiven 2-Halogen-thiopyryliumsalzen 3.Die Hydrolyse der 3, führt zu Gemischen von 1, und 4,6-Diphenyl-2H-thiopyranon-(2) 4, die Sulfhydrolyse zu reinem 1.1 und 2 sind zu 4 hydrolysierbar, mit primären Aminen bilden 1,2 und 3 die Azomethine 5. Am Stickstoff aliphatisch substituierte 5 werden durch Methyljodid zu 2-Dialkylamino-thiopyrylium-jodiden 6 alkyliert. Aliphatische Amine bewirken bei 4 einen Austausch des Ringschwefels gegen Stickstoff unter Bildung von 4,6-Diphenyl-pyridonen-(2) 9. Kupferbronze reagiert mit 1 unter Bildung von 4,4′,6,6′-Tetraphenyl-2,2′-dithiodipyrylen 10.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110109
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  • 40
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    7- und 8-Ringverbindungen. VIII. Transanulare H-Brücken in Cycloheptandiolen-(1,4) (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 36-39 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Am cis-4-Phenyl-4-hydroxy-cycloheptanol, cis-1,4-Dimethyl- und cis-1,4-Dibutylcycloheptandiol-(1,4) können infrarotspektroskopisch transanulare H-Brücken nachgewiesen werden. In den entsprechenden trans-Verbindungen findet keine transanulare Assoziation statt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110106
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  • 41
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    Zur Kenntnis der 2-Amino-1.3.4-oxdiazole. XXIV. Über die Bildung von Reaktionsprodukten aus 2-Hydrazino-pyridin bzw.-chinolin und 2-Amino-5-aryl-1.3.4-oxdiazolen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 71-77 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Hydrazino-pyridin- bzw. -chinolin-hydrochlorid (1 bzw. 2) reagiert mit 2-Amino-5-aryl-1.3.4-oxdiazolen 3 in Äthanol-Pyridin unter Abspaltung von Ammoniak zu Produkten, denen die Struktur von 3-(Nβ-Aroyl-hydrazino)-s-triazolo[4,3-a]pyridinen 4 bzw. 1-(Nβ-Aroyl-hydrazino)-s-triazolo[4,3-a]chinolinen 5 zugesprochen wird, da die Verbindungen 4 in einer für dieses Ringsystem typischen Oxydationsreaktion 1.2.4-Triazol ergeben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110110
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  • 42
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    Reaktionen mit Diazoketonen. 4. Synthese von Indigo (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 78-81 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Umsetzung von o-[p-Tosylamino]-benzoylchlorid mit ätherischer Diazomethan-lösung entsteht o-[p-Tosylamino]-ω-diazoacetophenon 5 in guter Ausbeute, aus dem über N-Tosyl-indoxyl 6 Indigo gewonnen werden kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110111
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  • 43
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    Über die Halogenaddition an trans-1-Phenyl-2-cyclohexyl-äthylen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 91-96 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In Lösungsmitteln unterschiedlicher Polarität wird die Umsetzung des trans-1-Phenyl-2-cyclohexyl-äthylens mit Brom und Chlor sowie komplexen Halogenierungsmitteln untersucht. Aus der IR-spektroskopischen Produktanalyse der Diastereomerenbildung ergeben sich Schlußfolgerungen über die Natur des Zwischenzustandes bei der elektrophilen Halogenaddition.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110113
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  • 44
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    Bicyclen. VI. Umsetzungen von CH-aciden Verbindungen mit Bicyclo-(2.2.1)-heptan-aldehyden (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 97-101 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Umsetzung von 2,5-Methylen-1,2,5,6-tetrahydrobenzaldehyd 1 bzw. 2,5-Methylenhexahydrobenzaldehyd 2 mit Acetophenonen liefert Chalkone, während Aceton vornehmlich zum Aldol-Additionsprodukt führt. KNOEVENAGEL-Kondensationen mit Malonsäure und ihren Derivaten verlaufen in der bicyclischen Reihe im allgemeinen glatt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110114
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  • 45
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    MO-LCAO-Berechnungen an schwefelhaltigen π-Systemen, 8. UV-S-Absorptionen von Aryldithiocarbonsäureestern (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 45-60 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die charakteristischen UV-S-Absorptionen einiger Aryldithiocarbonsäureester werden mitgeteilt. Die längstwelligen Banden werden auf der Basis der HMO - SC-Übergangsenergien diskutiert. Die ersten intensiven Absorptionsmaxima von Dithiobenzoesäureestern, die in p-Stellung mit Elektronendonatoren substituiert sind, dienen zur Ableitung spektroskopischer Substituentenkonstanten. Diese sind auch für andere Serien brauchbar.Schon die einfache HÜCKELsche MO - LCAO - (kurz HMO-) Methode erlaubt eine Beschreibung der Anregungsenergien der längstwelligen Absorptionsbanden heterocyclischer Schwefelverbindungen im ultravioletten und sichtbaren Spektrabereich [1-5].Diese quantenchemische Methode geht von sinnvollen Annahmen über die Eigenschaften der einzelnen Atome μ und Bindungen μν in den π-Elektronensystemen aus, die als empirische Parameter αμ = αC + hμβCC (COULOMB-Integral) und βμν = kμνβCC (Resonanzintegral) in die Rechnung eingehen (vgl. [6]).In welchem Umfang die bisher verwendeten Schwefelparameter auch für die Berechnung acyclischer Schwefelverbindungen geeignet sind, ist bisher nicht eingehend geprüft worden. Ein anderes offenes Problem ist das Verhältnis der Schwefelparameter zu denen anderer Heteroatome. Dithiocarbonsäureester, deren Präparation und Reduktion Gegenstand einer früheren Veröffentlichung war [7], bieten eine Möglichkeit, diesen Fragenkomplex in Angriff zu nehmen und das experimentelle spektroskopische Material zu systematisieren.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110108
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    Studies on the composition of metal cyanogen complexes. II. Spectrophotometric and Conductometric Studies on the composition of uranyl cyanomolybdate(IV) (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 102-104 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Interaction of uranyl nitrate with potassium-molybdocyanide has been investigated spectrophotometrically. The reaction occurs in the molar ratio of 1:1. This is further supported by conductometric titrations performed in aqueous and aqueous-alcoholic media. Formation constant and free energy of formation has been calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110115
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  • 47
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    Die experimentelle Ermittlung technisch brauchbarer MOLLIER-PONCHON-Diagramme von binären Systemen mit Mischungslücke am Beispiel des Systems Nitromethan/Wasser bei 50° (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 105-117 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mit einem anisothermen Mischungskalorimeter, das auf dem Prinzip der thermometrischen Titration beruht, und einem Verdampfungskalorimeter, das nach der Inertgas-Durchströmungsmethode arbeitet und die isotherme differentielle Verdampfungswärme zu bestimmen gestattet, wurde das Enthalpie-Konzentrations-Diagramm (MOLLIER-PONCHON-Diagramm) des Systems Nitromethan/Wasser für 50° in einer für technische Zwecke ausreichenden Güte bestimmt. Die experimentellen Ergebnisse konnten mit theoretischen Voraussagen von SCHUBERTH [2] unter Verwendung des zweiseitigen PORTERschen Ansatzes, der für die Beschreibung des Phasengleichgewichtsverhaltens des genannten Systems eine gute Näherung darstellt [3], verglichen werden; die Übereinstimmung war im Rahmen des zu Erwartenden zufriedenstellend.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/prac.19693110116
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  • 48
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    Über die Nitrierung substituierter Indone. IV. Diarylindone mit Substituenten am 3-Phenylrest (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 130-134 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde die Nitrierung von 2,3-diarylsubstituierten Indonen 1 mit einer Methyl- bzw. Methoxylgruppe am 3-Phenylrest untersucht. Die anfallenden Nitroprodukte wurden durch Säulenchromatographie an Aluminiumoxid gereinigt und ihre Struktur durch IR-Spektroskopie und oxydativen Abbau ermittelt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110118
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  • 49
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    Kinetik und Mechanismus der N2O4-Oxydation von Thioäthern (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 82-90 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die N2O4-Oxydation von Thioäthern R1 - S - R2 in Tetrachlorkohlenstoff als Lösungsmittel wurde nach der Methode der Konkurrenzreaktion kinetisch verfolgt. Die relativen RG-Konstanten von 6 kernsubstituierten Thioanisolen genügen der Hammett-Gleichung mit ϱ = -2,71; die relativen RG-Konstanten von 30 aliphatischen Sulfiden genügen der Taft-Gleichung mit ϱ* = -1,68 und δ = 0,85. Zwischen den RG-Konstanten der N2O4-Oxydation und denen der H2O2-Oxydation besteht eine lineare Freie-Energie-Beziehung. Alle Befunde deuten darauf hin, daß bei der untersuchten Reaktion ein nucleophiler Angriff des Sulfid-S-Atoms auf ein O-Atom des N2O4 stattfindet. Da die N2O4-Oxydation nach einem Geschwindigkeitsgesetz \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm RG = k}_{\rm 3} \left[{{\rm Thio}\mathop {\rm a}\limits^{..} {\rm ther}} \right]\left[{{\rm N}_{\rm 2} {\rm O}_{\rm 4} } \right]^2 $$\end{document} verläuft, muß ein cyclischer Übergangszustand angenommen werden, der zwei Moleküle N2O4 und ein Molekül Thioäther enthält.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110112
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  • 50
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    Untersuchung der Hydrierung in der flüssigen Phase. IV. Zusammenhang zwischen der Struktur einiger Olefine und ihrer Hydrierungsgeschwindigkeit (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 135-140 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Hydrierungsgeschwindigkeit unverzweigter Δ1-Olefine des Kettenlängenbereiches C6—C17 in Äthanol in Gegenwart von Pt, Pd- und Rh-haltigen Trägerkontakten sinkt mit steigender Kettenlänge des Olefins. Geschwindigkeitsbestimmend ist die Reaktion an der Katalysatoroberfläche an Pt-haltigen Trägerkonstanten.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110119
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    Untersuchungen zur Reinigung von Oxydextran (Dialdehyddextran) unter besonderer Berücksichtigung der Rückgewinnung des Natriumjodats (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 141-146 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde gezeigt, daß eine Reinigung des bei der Perjodatoxydation des Dextrans gebildeten Oxydextrans vom Jodat in einfacher Weise mittels Ionenaustauschern auch im präparativen Maßstab erfolgen kann. An Stelle des in der Literatur für analytische Arbeiten zur Abtrennung von Perjodat beschriebenen Austauschers Amberlite IRA - 400 (Acetatform) konnten mit Erfolg Austauscher der DDR-Produktion eingesetzt werden (Wofatit SBW und Wofatit L 150 des VEB Farbenfabrik Wolfen). Wofatit L 150 ist wegen seiner höheren Kapazität und seines universelleren Anwendungsbereiches (pH 1 - 14) dem Wofatit SBW vorzuziehen. Die Abtrennung des Oxydextrans vom Jodat gelingt quantitativ bei einer Rückgewinnung des Jodats von 99,0 ± 0,7%. Ist in der zu reinigenden Oxydextranlösung neben Jodat noch Natriumsulfat in größeren Mengen vorhanden, wie es für die Regeneration des Jodats zu Perjodat durch anodische Oxydation erforderlich ist, muß zweistufig adsorbiert/eluiert werden.
    Additional Material: 5 Tab.
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    URL: http://dx.doi.org/10.1002/prac.19693110120
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    Mono- und bicyclische α-Methylenketone als Dipolarophile (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 118-129 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Benzonitriloxid-Addition an die semicyclische CC-Doppelbindung der 2-Methylen-cycloalkanone-(1), der benzokondensierten und bicyclischen α-Methylenketone sowie der α,α′-Dimethylen-cycloalkanone beschrieben. Die erhaltenen Spiro-isoxazoline wurden NMR-spektroskopisch untersucht und daraus die Additionsrichtung festgelegt. Die LiAlH4-Reduktion vom Benzonitriloxid-Addukt des 2-Methylen-cycloheptanons-(1) liefert 1,2-Dihydroxy-2-(β-amino-β-phenyl-äthyl)-cycloheptan.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110117
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  • 53
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    Synthese und Gaschromatographische Trennung isomerer Alkendiine (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 153-158 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Als Testsubstanzen zur Untersuchung der Abbauprodukte von Diacetylen-MANNICH-Basen-methojodiden mit wäßriger Kalilauge wurden die isomeren Octendiine und Nonendiine 1-3 synthetisiert und deren gaschromatographische Identifizierung untersucht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110122
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  • 54
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    Zur Dünnschichtchromatographie von Alkylpyridinen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 159-161 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110123
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  • 55
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    Zum Verlauf der Addition von Äthylnitrit an Vinyläther (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 165-167 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110125
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  • 56
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    Synthese von neuen potentiell cytostatischen Thiazolverbindungen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 168-170 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110126
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  • 57
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    Über die Reaktion von Enaminen mit Estern der salpetrigen Säure (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 162-164 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110124
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  • 58
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    Modellversuche zur Peroxygenierung von natürlichen ungesättigten Fetten und Ölen, IV. Peroxygenierung ungesättigter Verbindungen mit sauerstoffhaltigen funktionellen Gruppen am aktivierten Kohlenstoffatom (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 147-152 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Peroxygenierungsgeschwindigkeiten bei Alkoholen, Essigsäureestern und Methyläthern mit olefinischen und aromatischen Gruppen werden verglichen. Die substituierten Essigsäureester und Methyläther bilden Hydroperoxide, deren Struktur bewiesen wurde. C—H-Bindungen mit benachbarten sauerstoffhaltigen funktionellen Gruppen und olefinischen oder aromatischen Resten reagieren leicht mit molekularem Sauerstoff. Enthält die funktionelle Gruppe Carbonylsauerstoff, so verläuft die Reaktion nach dem α-Methylen-Mechanismus; ist der Sauerstoff Brückenatom, so tritt keine Wanderung der Doppelbindung ein.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110121
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    Spot test for the Detection of Iron with 2,4-dihydroxyketoximes (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 171-171 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110127
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    Über Sultame. XIV. p-[N-Butansultamyl-(1,4)]-benzoesäure-(diäthylamino-äthyl)-ester (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 172-173 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110128
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    Darstellung von Pyridyl-3-thioäthern (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 174-177 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110129
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  • 62
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    Synthese neuer Aminoalkyläther von 7-Hydroxy-chromonen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 183-186 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110131
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    Isomere Chelone: TTHA und TTAHA, II. Das komplexometrische Verhalten von Triaminotriäthyl-amin-N-hexaessigsäure (TTAHA) (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 178-182 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110130
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    Substituted Benzimidazoles as Possible Antitubercular Compounds (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 187-189 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110132
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    Masthead (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969) 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110201
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    Diarylgermanium Dipseudohalides (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 190-192 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110133
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    Über Synthesen in der Theophyllinreihe. XIV. Synthese von Theophyllinderivaten der Diphenylpropylamin-Reihe (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 193-200 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird eine Reihe von Theophyllinderivaten beschrieben, welche zu den Diphenylpropylaminen gehören.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110202
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    Über die Bildung von in Nβ-Stellung durch Heterocyclen substituierten 5-Azo(hydrazino)-1.2.4-triazolen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 213-218 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1-Acyl-5-[(3-phenyl)-1.2.4-triazolyl-(5)]-diaminoguanidine sowie 1-Benzoyl-5-[(3-phenyl)-1.2.4-thiodiazolyl-(5)]- und 1-Benzoyl-5-[pyridyl-(4)]-diaminoguanidin cyclisieren in siedender Alkalilauge durch intramolekulare Wasserabspaltung und gleichzeitige Oxydation durch Luftsauerstoff zu in Nβ-Stellung durch Heterocyclen substituierten 3-Aryl(alkyl)-5-azo-1.2.4-triazolen, die durch Zinn (II)-chlorid in saurem oder durch Natrimdithionit in alkalischem Milieu zu den korrespondierenden Hydrazoverbindungen reduziert werden können.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110204
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  • 69
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    Bicyclen, VIII. Stereochemische Untersuchungen an Bicyclo-(2.2.1)-hepten-aldehyd (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 201-212 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Temperaturabhängigkeit des endo/exo-Isomerenverhältnisses bei der Umsetzung von Cyclopentadien mit Acrolein wird untersucht; in dieser kinetisch kontrollierten Reaktion fällt der Gehalt an endo-Form von 76% bei 20°C (in Dioxan) auf 71% bei 101°C. Für die Bildung der endo-Form wird bei etwa gleicher Aktivierungsentropie eine geringere Aktivierungsenthalpie benötigt (ΔΔH≠ 650 cal/Mol). Beim Erhitzen von 2,5-Methylen-1,2,5,6-tetrahydrobenzaldehyd 1 erfolgt Isomerisierung, wobei der Gleichgewichtswert bei 170°C nach wenigen Stunden erreicht wird; unter 100° bleibt die Ausgangszusammensetzung erhalten.Die Äquilibrierung mit Basen liefert den Gleichgewichtswert bereits nach wenigen Minuten: Kexo/endo = 0,695 (20°C); 0,925 (100°C). Die Basenkonzentration muß niedrig sein. da beim Aldehyd 1 leicht CANNIZZARO-Reaktion eintritt.Äquilibrierungsversuche mit Säuren schlugen infolge Nebenproduktbildung fehl.Durch alkalische Hydrolyse des Enolacetats 5 wird das thermodynamisch, durch saure Spaltung von 5 sowie des Enoläthers 6 oder der Enamine 7 wird das kinetisch bestimmte endo/exo-Verhältnis (∼ 75/25) erhalten.Reaktivitätsunterschiede der beiden Formen des Aldehyds 1 machen sich nicht bemerkbar.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110203
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    Heterocyclic azo dyes. IIFor Part I, see reference 7.. Azo Dyes Containing the Benzotriazole and/or benzimidazole nucleus (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 219-227 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis, some dyeing, and fastness properties of several new dispersed and acid dyes derived from the amino-benzotriazoles 1 & 3 and the aminobenzimidazoles 2a, 2b & 4 are described. The suitability of the amino derivatives 1, 2a, 2b, 3 & 4 as bases for azoic dyeing has also been studied. Several interesting observations between the properties of some synthesised dyes and the corresponding benzene or naphthalene analogues are cited.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110205
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    Synthesen mit N,N′-disubstituierten Schwefelsäurediamiden. IX. Zur Geometrie der SO2-Gruppe in substituierten Schwefelsäurediamiden (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 228-230 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Auswertung der IR-Spektren einiger substituierter Schwefelsäurediamide konnten für die SO2-Gruppe dieser Amide folgende Moleküldaten nach GILLESPIE berechnet werden: Bindungsabstand, Bindungswinkel, Kraftkonstante sowie Bindungsabstand.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110206
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    Zur Kenntnis der 2-Amino-1,3,4-oxdiazole. XXVI. Über die Umsetzung einiger 2-Amino-1,3,4-oxdiazole mit Benzylhydrazin (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 231-237 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Benzylhydrazin reagiert analog dem Phenylhydrazin und im Gegensatz zu aliphatischen Hydrazinen mit in 5-Stellung substituierten 2-Amino-1,3,4-oxdiazolen zu Diamino-guanidinen, die sich zu 1,2,4-Triazolen cyclisieren lassen.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110207
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    Über die Synthese von phosphororganischen Isocyanaten (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 256-259 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden neue Methoden zur Herstellung von phosphororganischen Isocyanaten durch Umsetzung von phosphororganischen Amidsalzen mit Phosgen oder Oxalylchlorid und aus N-Diphenyl-phosphinsäureureiden mit Phosgen beschrieben. Phosphonsäurediureide liefern mit Phosgen Dioxo-triazaphosphorinane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110209
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    Darstellung und Eigenschaften von Drei stabilen monomeren Nitrosoolefinen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 260-265 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Drei in 2,6-Stellung des aromatischen Kernes disubstituierte β-Methylstyrole wurden mit NOCl/HCl in α-Chloroxime überführt; diese lieferten mit Triäthylamin in Äther relativ stabile monomere Nitrosoolefine, die durch ihre Spektren sowie durch ihre Reaktion mit Piperidin zu α-Piperidinooximen charakterisiert wurden.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110210
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    Kinetik einiger elektrophiler Olefin-Additionen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 238-255 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Additionen von Jodthiocyanat (JSCN), 2,4-Dinitrobenzolsulfenylchlorid (ArSCl) und Nitrosylchlorid (NOCl) an Olefine verschiedener Strukturtypen wurden teils durch maßanalytische Verfolgung der Konzentrationen, teils durch gaschromatographische Auswertung von Konkurrenzreaktionen kinetisch untersucht. Die Reaktionen sind untereinander und mit der Brom-Addition verwandt. Die Additionsgeschwindigkeiten von JSCN, ArSCl und NOCl an kernsubstituierte Styrole geben eine gute Korrelation mit der HAMMETT-Gleichung, die Additionsgeschwindigkeiten an offenkettige aliphatische Olefine folgen der TAFT-Gleichung befriedigend. Die relativen Reaktionsgeschwindigkeiten von cis/trans-isomeren Olefinen sowie die von Cycloolefinen werden diskutiert. Offenbar läßt sich aus kinetischen Daten allein nicht sicher ableiten, ob der Übergangszustand elektrophiler Olefin-Additionen einem offenkettigen Carbeniumion, einem verbrückten. Ion oder einem Vierring ähnlich ist. Die Additionsgeschwindigkeiten von Quecksilberacetat (Hg(OAc)2) an Olefine zeigen eine völlig andere Abhängigkeit von der Struktur des Substrats als die Additionsgeschwindigkeiten von Br2, JSCN, ArSCl und NOCl.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110208
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    Friedel-Craft Reaction of Glutaric Anhydride with benzene and toluene (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 266-270 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of glutaric anhydride with benzene and toluene has been thoroughly studied. 4,4-Diphenyl-pent-4-enoic acid and 1,3-dibenzoyl propane were isolated as by-products of the reaction with benzene. The mechanism of formation of the by-products has been proved. In case of toluene no by-products were detected.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110211
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    Peptide, VIII. Synthese eines Hexapeptids aus der A-Kette des Insulins (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 271-277 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung der beiden Tripeptid-Derivate Boc - Gly - Ile - Cys(Bzl) - Azid und Ser - Leu - Tyr - OMe [3] wird das geschützte Hexapeptid Boc - Gly - Ile - Cys(Bzl) - Ser - Leu - Tyr - OMe erhalten. Dieses Peptid entspricht der Aminosäuresequenz 9-14 der A-Kette des Pferdeinsulins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110212
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  • 78
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    Peptide. X. Synthese eines Pentapeptids mit einer Teilsequenz der bisher angenommenen Struktur des Circulins B (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 278-285 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Synthese des vollständig geschützten Pentapeptid-Derivates Boc - Dab(Z) - D - Leu - Ile - Dab(Z) - Dab(Z) - NHNH2 [2] beschrieben. Es entspricht einer Teilsequenz der bisher für das Circulin B angenommenen Struktur. Der Aufbau erfolgte stufenweise vom Carboxylende her unter Benutzung der Nitrophenylester und der gemischten Anhydride.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/prac.19693110213
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  • 79
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    7· und 8-Ringverbindungen. X. Benzolinduzierte Verschiebungen in den H1-NMR-Spektren der Alkylcycloheptanone (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 296-301 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An 12 Alkylcycloheptanonen wurde die Verschiebung der Protonensignale im Kernresonanzspektrum beim Übergang vom Lösungsmittel CDCl3 zu C6H6 untersucht. Die erhaltenen Ergebnisse lassen sich zur Konformation der Cycloheptanone in Beziehung setzen und weisen auf das Vorliegen dieser Verbindungen als axialsymmetrische Sesselkonformation hin.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110215
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  • 80
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    Neue Derivate des Pyridazins (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 286-295 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das neuerdings leicht zugängliche 3-Amino-4-hydroxy-6-methy1-pyridazin 1 [1] erschließt einen neuen Zugang zu Derivaten des Pyridazins. Die Umsetzung mit salpetriger Säure liefert in verdünnter Schwefelsäure 3,4-Dihydroxy-6-methyl-pyridazin 3, in konz. Salzsäure dagegen 3-Chlor-4-hydroxy-6-methylpyridazin 2. Das Chloratom in 2 ist leicht nucleophil ersetzbar unter Bildung der 3-Hydroxy-, 3-Amino- bzw. 3-Phenylthio-Verbindungen 3, 7a-i. Noch leichter reagieren die entsprechenden 4-Methoxyverbindungen, so daß auch die interessanten3-Arylsulfonylamino-4-methoxy-Derivate 8k, l gut zugänglich sind.Mit Phosphoroxidchlorid liefert 2 das 3,4-Dichlor-6-methyl-pyridazin 10, das - ebenso wie 2 - in Gegenwart von Palladium reduktiv enthalogeniert werden kann, wobei 3-Methyl-pyridazin 11 bzw. das bisher unbekannte 4-Hydroxy-6-methyl-pyridazin 9 entstehen. Die Umsetzung des 3-Amino-4-hydroxy-6-methyl-pyridazins 1 mit Dimethylsulfat führt nur zum 4-Methoxy-Derivat 4. In gleicher Weise reagieren die 4-Hydroxy-6-methylpyridazine 7a-i und 2. Die Struktur der dargestellten Verbindungen wird gesichert. Die Verbindungen mit 4-Hydroxygruppe zeichnen sich durch hohe Schmelzpunkte, relativ geringe Löslichkeiten in Wasser und damit zusammenhängend sehr stark assoziierte IR-Banden der OH-Gruppe aus.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110214
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  • 81
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    Pyrogallol Red and Dibromopyrogallol Red as interesting chromogenic reagents (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 328-335 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preliminary studies on the different chelates of PGR and BPGR with a number of metal ions have been made. Different conditions under which these chelates are formed have been evaluated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110217
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  • 82
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    Infrared Spectra of Nickel Cyanide-Ammonia Clathrate Compounds (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 302-327 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nickel cyanide-ammonia forms clathrate compounds with a variety of organic molecules such as aniline, benzene, pyridine, pyrrole, and thiophene. The present results suggest that there is a definite indication of captured molecules and the absorption characteristics of molecules in their environment in nickel cyanide-ammonia cage are similar to those of the molecules in liquid state. In accepting the guest molecules, the nickel cyanide-ammonia structure is not changed, since apart from the appearance of bands due to the trapped molecules, the bands due to pure nickel cyanide-ammonia remain virtually unchanged. The infrared spectra of nickel cyanide-ammonia clathrates in the 100-4000 cm-1 region are described in this investigation.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110216
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  • 83
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    Bicyclen. VII. Über Azomethine, Enamine, Acylhydrazone und Amine aus der Bicyclo-(2,2,1)-heptan-Reihe (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 336-349 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110218
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  • 84
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    Synthesen mit N,N′-disubstituierten Schwefelsäurediamiden. X. Über Bindungs- und Gruppenrefraktionen bei substituierten Schwefelsäurediamiden (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 350-352 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110219
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  • 85
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    Masthead (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969) 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110301
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  • 86
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    Alkylierung und Aminomethylierung von 3-Methylpyrazol-5-carbonsäureäthylester (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 363-369 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Umsetzung von 3-Methylpyrazol-5-carbonsäureäthylester mit Dialkylaminoalkylhalogeniden entstehen Isomerengemische der 1,3- und 1,5-dialkylierten Ester. Bei der α-Aminomethylierung erhält man ausschließlich den 1,5-dialkylierten Ester.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110303
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  • 87
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    Azomethine mit Stickstofflost-Gruppen. XI. Reaktionen von Cyanacetylamino-Verbindungen mit p-Nitroso-N.N-bis-(β-chloräthyl)-anilin und p-Nitroso-N.N-bis-(β-hydroxyäthyl)-anilin (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 353-362 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Verschiedene Cyanacetylamino-Verbindungen wurden mit p-Nitroso-N.N-bis-(β-chloräthyl)-anilin und p-Nitroso-N.N-bis-(β-hydroxyäthyl)-anilin zu den entsprechenden Cyananilen umgesetzt. Bromcyanacetamid lieferte analoge Nitrone. Aus Cyanacetylverbindungen, deren Amidsubstituent in einer zum Ringschuluß geeigneten Stellung ein reaktionsfähiges H-Atom besitzt, bildeten sich unter HCN-Abspaltung Anile cyclischer Verbindungen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110302
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  • 88
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    Nitrosierung und nitrosierende Spaltung von Carbon-säureestern mit Methylnitrit/Natriummethylat (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 370-378 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbonsäureester R—CH2—COOMe werden durch MeONO/NaOMe in aprotischen Lösungsmitteln α-nitrosiert; man erhält in Ausbeuten zwischen 14 und 34% die entsprechenden α-Oximinocarbonsäureester. α-Verzweigte Carbonsäureester werden durch MeONO/NaOMe nitrosierend gespalten: Die primär gebildeten Ketoxime lassen sich wegen des Auftretens von Folgereaktionen nur in Ausbeuten unter 10% isolieren.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110304
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  • 89
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    Heterocyclen aus Lävulinsäure. VI. Über die Bildung von Pyrrolo[3.4-c]-pyrazolen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 379-382 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die aus 2-Oxolävulinsäureäthylester mit Aminen und Aldehyden gebildeten 3-Acetyl-4.5-dioxopyrrolidine 1 reagieren mit Arylhydrazinen zu entsprechenden 6-Oxo-1.4.5.6-tetrahydropyrrolo[3.4-c]pyrazolen 2.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110305
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  • 90
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    Diamino-as-triazincarbonsäuren aus 6-Azalumazinen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 438-444 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus 1-Methyl-7-amino-6-azalumazinen werden substituierte 3,5-Diamino-as-triazin-carbonsäuren-6 dargestellt. Durch Erhitzen über den Schmelzpunkt entstehen daraus substituierte Diamino-as-triazine. Die alkalische Verseifung von 1-Methyl-7-äthylmercapto-6-azalumazin ergab 1-Methyl-7-hydroxy-6-azalumazin.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110313
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  • 91
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    Studien zur Thermodynamik binärer Flüssigkeitsgemische mit homologen Formamiden. IX. Mittlere molare Zusatzeigenschaften binärer Systeme aus N-disubstituierten Formamiden und stark polaren Flüssigkeiten (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 420-428 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei 25°C wurden an den binären Systemen Methanol/Dimethylformamid, Aceton/Dimethylformamid, Äthanol/Diäthylformamid und Aceton/Diäthylformamid mittlere molare Zusatzenthalpien und mittlere molare Zusatzvolumina bestimmt. Die kalorimetrischen Messungen erfolgten vorwiegend im mittleren, die pyknometrischen im gesamten Molenbruchgebiet. Die experimentell gefundenen Zusatzeffekte ergaben sich bei äquimolarer Zusammensetzung in der genannten Reihenfolge der Systeme wie folgt: -26,5; +8,8; +72,5; +10,2 cal/Mol bzw. -0,385; -0,26; -0,095 und +0,036 cm3/Mol. Ihre Konzentrationsabhängigkeiten zeigten schwache bis mäßige Asymmetrie.Diese Ergebnisse führten zusammen mit früher ermittelten molaren freien Zusatzenthalpien zu qualitativen Modellvorstellungen über molekularstrukturell bedingte Nahordnungszustände in den vier Mischphasen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110311
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  • 92
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    Stickstoffhaltige Steroide, XXII. Darstellung von 6-Azido- und 6-Amino-androstan-und -pregnanderivaten (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 445-454 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Synthese von 6-Azido- und 6-Amino-17 α-acetoxy-progesteron und von 6-Azido- und 6-Amino-testosteronacetat beschrieben. Die Einführung der Stickstoffunktion kann durch Aufspaltung des entsprechenden Epoxides mit Natriumazid erfolgen. Die Aminoverbindungen werden aus den Azidoverbindungen durch Reduktion mit Hydrazinhydrat/Raney-Nickel erhalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110314
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  • 93
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    Zur Reaktion von Caprolactam mit SulfurylchloridTeilweise vorgetragen auf der Chemiedozententagung in Potsdam am 8. 7. 1965. (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 455-462 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Umsetzung von Caprolactam mit Sulfurylchlorid in CCl4 wird ein bicyclisches, chlorhaltiges Amidin (1-[3,3-Dichlor-azacyclohepten-(1)-yl (2)]-2-oxo-3,3-dichlorazacycloheptan) 2 gebildet, dessen Struktur durch NMR-Spektroskopie aufgeklärt wurde. Die Bildungsweise von 2 aus Caprolactam, α, α-Dichlor-caprolactam und dem bisher als Dicaprolactimäther bezeichneten 1-[Azacyclohepten-(1)-yl-(2)]-2-oxo-azacycloheptan 5 wurde untersucht.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110315
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  • 94
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    Alkali-phosphorverbindungen und ihr reaktives Verhalten. LX. Zur Spaltung der P-P-Bindung mit Lithium-phospiden LiPR2 bzw. Li2PR (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 463-471 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird über die Reaktionen von Bi- und Cyclopoly-phosphinen mit P-substituierten Lithiumphosphiden berichtet. Die Umsetzung von Tetraphenylbiphosphin mit LiPR2 (R = C2H5; c-C6H11) und Li2PR′ (R′ = C6H5) führt zunächst zu unsymmetrischen Biphosphinen R′2P-PR2 bzw. R′(Li)P-PR′2, die mit weiterem LiPR2(Li2PR′) die symmetrischen Biphosphine R2P-PR2 bzw. R′(Li)P-P(Li)R′ bilden. Aus „Phenylphosphor“ und Li2PC6H5 entstehen Verbindungen des Typs Li-(PC6H5)x-Li (x = 2, 3, 4). Versuche, Lithium-phosphide der Zusammensetzung Li-(PC6H5)x-P(C6H5)2 (x 〉 1) aus „Phenylphosphor“ und Lithium-diphenylphosphid herzustellen, blieben ohne Erfolg. Es gelang nur, ihre Zerfalls- bzw. Abbauprodukte 1.4-Dilithium-1.2.3.4-tetraphenyl-tetraphosphin, Tetraphenylbiphosphin und 1-Lithium-1.2.2-triphenylbiphosphin zu isolieren.
    Additional Material: 3 Tab.
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    URL: http://dx.doi.org/10.1002/prac.19693110316
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  • 95
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    Zur Problematik der Bestimmung des Enthiolgehaltes einiger Thiocarbonylverbindungen mit Hilfe der Jodtitration (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 472-476 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Anwendbarkeit der jodometrischen Titration zur Bestimmung von Enthiolgehalten einiger Thiocarbonylverbindungen wird geprüft. Verläßliche Ergebnisse lassen sich nur bei völlig wasserfreier Arbeitsweise erzielen, anderenfalls wird ein Enthiolgehalt nur vorgetäuscht. Die Endpunktsanzeige kann optisch oder besser potentiometrisch erfolgen. Rücktitrationsverfahren mit wäßrigen Lösungen sind ungeeignet. Beim potentiometrischen Verfahren vermögen einige CH-acide Thion- und Dithioester mit basischen Leitsalzen Enthiolate zu bilden, die wie freie Enthiole reagieren, weshalb die Methode bei diesen Verbindungen nicht brauchbar ist.
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    Substituted Triazoles as Possible Antitubercular CompoundsThis investigation was supported by the State Council of Scientific and Industrial Research, Lucknow in the form of a Junior Research Fellowship to one of us (H.H.S.) (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 523-526 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110324
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    Masthead (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969) 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110401
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  • 98
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    Heterocyclen aus Lävulinsäure. VIII. Darstellung einiger Thiazolinthione-(2) (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 527-528 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110325
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    Darstellung und Acidität von Äthylendiamin-N-methyl-phosphonsäuren (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 529-538 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Umsetzung von Äthylendiamin mit Chlormethylphosphonat in alkalischem Medium führte zur Bildung von β-Aminoäthyl-aminomethylphosphonsäure 1, Äthylendiamin-N,N′-di(methyl-phosphonsäure) 2, Äthylendiamin-N,N,N′-tri(methylphosphonsäure) 3 und Äthylendiamin-N,N,N′,N′-tetra(methylphosphonsäure) 4. Durch potentiometrische pH-Titration wurden die pK-Werte der Säuren 1 bis 4 bestimmt. Aus den pK-Werten wurden Dissoziationsschemata abgeleitet und mit denen von Aminopolycarbonsäuren verglichen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110402
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    Electronic Resource
    Zur Kenntnis der 2-Amino-1,3,4-oxdiazole, XXVIII. Darstellung und Reaktionen von 4-Amino-5-arylamino-s-triazolen (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 539-548 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Einwirkung von Hydrazinhydrat auf 2-Arylamino-5-alkyl-1,3,4-oxdiazole entstehen neben 3-Alkyl-4-aryl-s-triazolonen-(5) 4 die 3-Alkyl-4-amino-5-arylamino-s-triazole 3, deren Eigenschaften untersucht werden.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110403
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