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  • 1
    Electronic Resource
    Electronic Resource
    A new synthesis of .alpha.-phosphinoyl cycloalkanones by phosphinylation of cycloalkanone enolates. Crystal and molecular structure of 2-(diphenylphosphinoyl)-3-[tris(methylthio)methyl]cyclopentanone and 2-(diphenylphosphinoyl)-3-carbomethoxycyclopentanone (1990)
    s.l. : American Chemical Society
    The @journal of organic chemistry 55 (1990), S. 1198-1203 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00291a018
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  • 2
    Electronic Resource
    Electronic Resource
    Zum Schwingungsverhalten pentakoordinierter Zinn(IV)-organischer Verbindungen. IR- und Raman-Untersuchungen an 2,8,9-Tricarbastannatranen (1990)
    Springer
    Monatshefte für Chemie 121 (1990), S. 615-623 
    Details
    ISSN: 1434-4475
    Keywords: Stannatrane ; Vibrational spectroscopy ; Proof of pentacoordination ; Assignment of vibrations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Results are reported of IR and Raman investigations on four 1-substituted 2,8,9-tricarbastannatranes (1,X=Cl;2,X=Br;3,X=I;4,X=Me). Group-theoretic investigations confirm the trigonal-bipyramidal configuration of the tin atoms. The vibrational frequencies of the coordination (Sn←N) are correlated to the distancesd (Sn-N). Besides the results on the vibrations of the coordination polyhedrons other results are reported concerning the enantiomerization of the chiral atran skeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809764
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  • 3
    Electronic Resource
    Electronic Resource
    Über das Echinopsin (1923)
    Springer
    Monatshefte für Chemie 43 (1923), S. 469-475 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01526800
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  • 4
    Electronic Resource
    Electronic Resource
    X-ray and infrared spectroscopic studies of potassium hydrogen bis-(2,4-dichlorophenoxyisobutyrylglycinate) (1982)
    Springer
    Journal of chemical crystallography 12 (1982), S. 343-350 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Crystals of the title compound belong to space groupP¯1, withZ=1. TheK + ions and the acidic protons occupy centers of symmetry. This and the very short O⋯O distance of 2.430 (9) Å classify the compound as a typeA acid salt. The infrared spectrum shows the υ s OHO band near 800 cm−1 with remarkably good definition at −170°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01159050
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of chirality, amino acid sequence, and protecting groups on the intramolecular interaction behavior of dipeptide and tripeptide derivatives (1996)
    New York : Wiley-Blackwell
    Biopolymers 39 (1996), S. 681-690 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The intramolecular interaction of protected dipeptides and tripeptides containing the amino acid units Ala, Phe, and Val was studied by means of ir spectroscopy. The NH and CO regions of the compounds dissolved in carbon tetrachloride clearly show the existence of different intramolecular hydrogen bonds. Using solvents with higher polarity such as chloroform and methylene chloride, the association bands disappear. Investigating the substances with the same amino acid sequence but opposite chirality of the central C atom in the peptide chain, we observed different band shapes in the CO and NH regions. Large effects were found when the chirality of the Phe unit in the second position was changed. This is probably due to the steric hindrance originated by the rotation of the aromatic ring in the side chain.The protecting groups, Z (benzyloxycarbonyl) or Boc (tert-butyloxycarbonyl) residues at the N-terminal group and methyl- or tert-butyl esters at the C-terminal group, influence the solubility of the substances in nonpolar solvent, as well as the NH and CO association band profiles in the methylene chloride solutions.The consequences of changing the sequence of the amino acids are discussed for the tripeptide derivatives.Besides a qualitative discussion, some quantitative considerations concerning the intramolecular interaction are also given to illustrate the different stabilities of the associates. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Verbindungen mit dem 2,4-Dimethyl-2,4-diaza-1,5-diphosphapentan-3-on-Grundgerüst; Synthese, Struktur und Eigenschaften von 1,5-Di-tert-butyl-2,4-dimethyl-1,5-diphenyl-2,4-diaza-l,5-diphosphapentan-3-on und Derivaten (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2705-2714 
    Details
    ISSN: 0009-2940
    Keywords: 2,4-Diaza-1,5-diphosphapentan-3-ones, 2,4-dimethyl- ; Coordination compounds ; Chromium complexes ; Molybdenum complexes ; Tungsten complexes ; Iron complexes ; Platinum complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Compounds with the 2,4-Dimethyl-2,4-diaza-1,5-diphosphapentan-3-one Skeleton; Synthesis, Structure, and Properties of 1,5-Di-tert-butyl-2,4-dimethyl-1,5-diphenyl-2,4-diaza-1,5-diphosphapentan-3-one and Its DerivativesN,N′-Dimethyl-N-N′-bis(trimethylsilyl)urea (1) reacts with tert-butylchlorophenylphosphane (2) to form the monophosphino/ trimethylsilyl-substituted urea 3. Under more vigorous conditions the bisphosphino-substituted derivative 4 was also obtained. The reaction of 4 with the tetracarbonyl norbornadiene derivatives of Cr, Mo, and W furnished the unusual chelate complexes 5-7, in which the ligand 4 is coordinated to the metal through one of the two phosphorus atoms and the oxygen atom of the carbonyl group. The free ligand 4 and the isostructural complexes 5 and 6 were subjected to X-ray structure analyses. The approximate twofold symmetry of 4 is lost as a result of a major conformational change on complex formation. In contrast, 4 reacts with Fe2(CO)9 and with (COD)-PtCl2 (COD=1,5-cyclooctadiene) to give the complexes 8 and 9. In both 8 and 9 the ligand 4 is coordinated by both phosphorus atoms. Reaction of 4 with sulfur and selenium led to the disulfide 10 and diselenide 11, whereas with tellurium no reaction was observed.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241211
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  • 7
    Electronic Resource
    Electronic Resource
    Zum IR-Spektrum des Nitrosodicyanmethanid-Ions [ONC(CN)2]-Professor Herbert Funk zum 75. Geburtstage am 24. April 1970 gewidmet (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 373 (1970), S. 230-236 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The infrared spectrum of [ONC(CN)2]- is described and an assignment is given. In order to facilitate this assignment, 15N is used. Complexes, formed by this anion, are also investigated by means of IR spectroscopy. The shift of the bands of the anion are reported and a discussion concerning the bonding relations of the complexes is given. Some remarkable isotopic effects are mentioned.
    Notes: Das IR-Spektrum von [ONC(CN)2]- wird beschrieben. Die Zuordnung der Banden geschieht mit Hilfe von partieller 15N-Substitution. Bildet dieses Anion Komplexe, so verschieben sich seine IR-Banden. Die Verschiebungen werden angegeben und die möglichen Bindungsverhältnisse diskutiert. Ferner wird ein unerwarteter Isotopieeffekt erwähnt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19703730305
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese und Charakterisierung von Aquapentachloroplatinaten(IV) - Struktur von [K(18-Krone-6)][PtCl5(H2O)] (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1954-1958 
    Details
    ISSN: 0044-2313
    Keywords: Aquapentachloroplatinates(IV) ; (18-crown-6)-potassium-aquapentachloroplatinate ; crown ether complexes ; X-ray structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Characterization of Aquapentachloroplatinates(IV) - Structure of [K(18-crown-6)][PtCl5(H2O)]The crown ether complex of the aquapentachloroplatinic acid of the composition [H13O6][PtCl5(H4O2)] · 2(18-cr-6) (2) reacts with K2CO3 and [NnBu4]OH in aqueous solution to give [K(18-cr-6)][PtCl5(H2O)] (5 a) and [NnBu4][PtCl5(H2O)] · 1/2 (18-cr-6) · H2O (5 b), respectively. Both compounds were characterized by microanalysis, vibrational (IR, Raman) and NMR (1H, 13C, 195Pt) spectroscopy. The X-ray structure analysis of 5 a (orthorhombic, pnma; a = 16,550(4), b = 18,044(3), c = 7,415(1) Å; Z = 4; R1 = 0,0183; wR2 = 0,0414) reveals that the crystal is threaded by chains built up of [PtCl5(H2O)]- and [K(18-cr-6)]+ units. There are tight K … Cl contacts (d(K—Cl1)) = 3,0881(9) Å and OW—H—Ocr hydrogen bridges (d(O1 … O2) = 2,806(3) Å) between these units. The coordination polyhedron [PtCl5O] has approximately C4v symmetry.
    Notes: Der Kronenetherkomplex der Aquapentachloroplatinsäure mit der Zusammensetzung [H13O6][PtCl5(H4O2)] · 2(18-cr-6)Abkürzungen: 18-cr-6 = 18-Krone-6; OW, Ocr = Sauerstoff von Wasser bzw. Kronenether. (2) reagiert mit K2CO3 und [NnBu4]OH in wäßriger Lösung zu [K(18-cr-6)][PtCl5(H2O)] (5 a) bzw. zu [NnBu4][PtCl5(H2O)] · 1/2 (18-cr-6) · H2O (5 b). Beide Verbindungen wurden durch Elementaranalyse sowie schwingungs- (IR, Raman) und NMR-spektroskopisch (1H, 13C, 195Pt) charakterisiert. Die Röntgenkristallstrukturanalyse von 5 a (orthorhombisch, Pnma; a = 16,550(4), b = 18,044(3), c = 7,415(1) Å; Z = 4; R1 = 0,0183; wR2 = 0,0414) zeigt, daß der Kristall von Ketten durchzogen wird, die aus [PtCl5(H2O)]- und [K(18-cr-6)]+ Einheiten aufgebaut sind. Zwischen ihnen bestehen enge K … Cl Kontakte (d(K—Cl1) = 3,0881(9) Å) sowie OW—H—Ocr Wasserstoffbrücken (d(O1 … O2) = 2,806(3) Å). Für das koordinationspolyeder [PtCl5O] kann näherungsweise C4v-Symmetrie angenommen werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976231220
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Kenntnis des Oxy-acanthins (1925)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 58 (1925), S. 2280-2285 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19250581007
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