Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Ring Expansion of Heterocyclic Ketene N,X-Acetals and 2-Alkylidenedihydroindoles with Methanesulphonyl Azide by [3 + 2] Cycloaddition and Subsequent Extrusion of Molecular Nitrogen (1996)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1996 (1996), S. 1541-1549 
    Details
    ISSN: 0947-3440
    Keywords: [3 + 2] Cycloaddition ; Ketene N,X-acetals, cyclic ; Azides, electrophilic ; Amidines, cyclic N-sulphonyl- ; Ring expansion of heterocycles ; 1,2-Shift of carbon, nitrogen, sulphur, or selenium ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methanesulphonyl azide (2) reacts readily with isolated cyclic ketene N,X-acetals of type 1, viz. 10a, d, 15b, d, and 22a-c, or those that are generated in situ by deprotonation of the corresponding 2-alkylbenzazolium tetrafluoroborates, i.e. 14a → 15a, 14b → 15b, and 18 → 19. Ring-expanded products are formed by extrusion of molecular nitrogen from intermediate labile [3 + 2] cycloadducts 3 with concomitant 1,2-shift of N (route A1 → 12, 24) or X (route A2 → 16, 20, 21). In addition, 3 may undergo [3 + 2] cycloreversion into N-sulphonylimine 5 and diazoalkane 6 (route B → 13, 17, 25). The configurations of the cyclic N-sulphonylamidines 16b and 21b, the N-sulphonylimine 24 and the N-sulphonylamine 27 are elucidated by means of X-ray diffraction analyses. The ratio of the (useful) ring-expansion reactions vs. the unwanted formation of 5 + 6 is hardly influenced by the solvent employed and temperature of the experiment but strongly by the nature of the potential migrating atom and the substituents at the α-carbon atom.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199619961008
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Compounds of Germanium and Tin, 20Part 19: Ref.[1].. Stannylene Complexes of Iron and Nickel without Donor StabilizationDedicated to Professor Alois Haas on the occasion of his 65th birthday. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1565-1567 
    Details
    ISSN: 0009-2940
    Keywords: Tin compounds ; Iron complexes ; Nickel complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Treatment of [Fe2(CO)9], [Fe3(CO)12] or [Ni(CO)4] with the alkylarylstannylene RR′Sn: [R= 2,4,6-tBu3C6H2, R′ = CH2C(CH3)2-3,5-tBu2C6H3] furnishes the stannylene complexes [(OC)4Fe=SnRR′] (5) and [(OC)3Ni=SnRR′]. The X-ray structure analysis of 5 reveals a trigonal-bipyramidal environment of the iron atom with the tricoordinated tin atom occupying an axial site, thus indicating that RR′Sn: is a strong σ-donor but weak π-acceptor.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291225
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Compounds of Germanium and Tin, 16Part 15: Ref.[1]. A Tetraaryldistannene with a Long Tin - Tin Multiple Bond and Differing Environments at the Tin Atoms (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 983-985 
    Details
    ISSN: 0009-2940
    Keywords: Diarylstannylene ; Tetraaryldistannene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Although tetrakis(2-tert-butyl-4,5,6-trimethylphenyl)distannene (9), the first tetraaryl-distannene to be reported on, is stable in the solid state, only the monomeric stannylene 8 can be detected in solution. An X-ray crystal structure analysis of 9 reveals a long tin-tin bond length of 291.0(1) pm and a trans-bent Sn2C4 framework with different fold angles of 21.4° and 64.4°.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951281004
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Two Alternatives of Heteroallene Insertion in Metal  -  Ligand Bonds of Five-Coordinate Ruthenium(II) and Osmium(II) Complexes [MXY(CO)(PiPr3)2]Herrn Professor Nils Wiberg zum 60. Geburtstag gewidmet. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 41-47 
    Details
    ISSN: 0009-2940
    Keywords: Ruthenium complexes ; Osmium complexes ; Insertion reactions ; Carbon disulfide ; Carbon dioxide ; Methyl isothiocyanate ; Zwitterionic ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The five-coordinate chloro(hydrido)- and hydrido(iodo)ruthenium(II) and -osmium(II) compounds [MHX(CO)(PiPr3)2] (1, 2, 6, 7) react with CS2 to give the octahedral dithioformato complexes [MCl(CO)(PiPr3)2(η2-S2CH)] (3, 4, 8, 9) in excellent yields. In the initial step, an addition of the heteroallene to the metal center occurs which is followed by insertion of CS2 into the M - H bond. On treatment of the dichlororuthenium(II) derivative [RuCl2(CO)(PiPr3)2] (10), which is prepared from RuCl3 · aq and PiPr3 in methanol, with carbon disulfide insertion into one of the Ru - PiPr3 bonds takes place to give the six-coordinate ruthenium(II) complex 12 with zwitterion -S2CPiPr3+ as a chelating ligand. While the reaction of [OsH(SPh)(CO)(PiPr3)2] (13) with MeSCN leads to addition of the thionitrile to the metal center, the starting material reacts with MeNCS by insertion of the heteroallene into the Os - SPh bond to give two stereoisomers 15a, b, in which the nitrogen atom of the chelate ring is either cis or trans to the hydrido ligand. The octahedral methoxydithiocarbonato- and formatoosmium(II) compounds 16 and 17 are prepared from 2 and CS2 or CO2 in the presence of NaOMe. The crystal and molecular structures of 4 (M = Os), 12 and 15a have been determined.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Halfsandwich-Type Osmium Complexes Containing Phosphanylmethanide and Phosphanyl Alcoholate Anions as Bidentate LigandsDedicated to Professor Herbert W. Roesky on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 1175-1181 
    Details
    ISSN: 0009-2940
    Keywords: Osmium complexes ; Hydrido complexes ; Functionalized phosphane ligands ; Phosphanylmethanide ligand ; Phosphanyl alcoholate ligand ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mononuclear dichloroosmium(II) complexes [(mes)-Os(L)Cl2] (2-5) with the phosphanyl ether L = iPr2PCH2-CH2OMe and phosphanyl esters L = IPr2P(CH2)nCO2R as ligands are obtained from [(mes)OsCl2]n and L in almost quantitative yield. While compound 3 (L = iPr2PCH2CH2CO2Me) reacts with Mg/Hg in THF in the presence of ethanol to give the monohydrido derivative 6, treatment of 4 (L = iPr2PCH2-CO2Me) or 5 (L = iPr2PCH2CO2Et) with Al2O3/NaH in THF yields the phosphanylmethanide complexes [(mes)-Os{k2(P,C)-iPr2PCHCO2R}Cl] (7, 8). In contrast to the reaction of 4 with Mg/Hg in THF/EtOH which yields the dihydrido compound [(mes)OsH2{k(P)-iPr2PCH2CO2Me}] (10), the corresponding reaction of 4 with excess PhMgBr does not lead to an OsPh2 species but instead gives the new chelate complex [(mes)OsPh{k2(P,O)-iPr2PCH2CPh2O}] (11). The crystal and molecular structures of 7 and 11 were determined.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951281207
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Tetrapnictidotitanate(IV) M4TiX4 (M = Sr, Ba; X = P, As), hierarchische Derivate der KGe-Struktur K4□Ge4Professor Roger Blachnik zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1879-1885 
    Details
    ISSN: 0044-2313
    Keywords: Tetrapnictidotitanate(IV) ; centered heterocubanes ; hierarchical derivative of Cr3Si and KGe ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetrapnictidotitanates(IV) M4TiX4 (M = Sr, Ba; X = P, As), hierarchical Derivatives of the KGe Structure K4□Ge4The four new tetrapnictidotitanates(IV) Sr4TiP4, Sr4TiAs4, Ba4TiP4 and Ba4TiAs4 are synthesized from the binary pnictides MX (M = Sr, Ba and X = P, As) and elementary titanium in tantalum ampoules. The compounds are isotypic and isoelectronic with Ba4SiAs4 (space group P43n (no. 218); cP72; Z = 8; Sr4TiP4: a = 1259.0(1) pm; Sr4TiAs4: a = 1288.3(4) pm; Ba4TiP4: a = 1316.6(2) pm; Ba4TiAs4: a = 1346.9(2) pm). The transition metal compounds form cubic, metallic reflecting crystals (Sr4TiP4 (green); Sr4TiAs4 (silver coloured); Ba4TiP4 (silver coloured); Ba4TiAs4 (violet). They are semiconducting and very sensitive against air and moisture. The structure is a hierarchical derivative of Cr3Si (A15) and KGe type: Cr6Si2 ≙ (□Ge4K4)6(□Ge4K4)2 ≙ (TiX4M4)6(TiX4M4)2, where Ti occupies the positions of the Cr3Si structure, and the alkaline-earth metal and pnicogen atoms occupy the positions of the KGe structure. Therefore, Ti is surrounded by four X and four more distant M atoms forming a heterocubane. The mean bond lengths are: d(Ti—P) = 238.0(5) pm; 307 ≤ d(Sr—P) ≤ 333 pm; d(Ti—As) = 245.9(4); 313 ≤ d(Sr—As) ≤ 341 pm; d(Ti—P) = 240.5(5); 324 ≤ d(Ba—P) ≤ 348 pm; d(Ti—As) = 248.3(3) pm; 331 ≤ d(Ba—As) ≤ 355 pm.
    Notes: Die vier neuen Tetrapnictidotitanate(IV) Sr4TiP4, Sr4TiAs4, Ba4TiP4 und Ba4TiAs4 wurden aus den binären Komponenten MX (M = Sr, Ba und X = P, As) und elementarem Titan in Tantalampullen dargestellt. Alle Verbindungen sind isotyp und isoelektronisch zu Ba4SiAs4 (Raumgruppe P43n (Nr. 218), cP72, Z = 8; Sr4TiP4: a = 1259.0(1) pm; Sr4TiAs4: a = 1288.3(4) pm; Ba4TiP4: a = 1316.6(2) pm; Ba4TiAs4: a = 1346.9(2) pm). Die Übergangsmetallverbindungen bilden würfelförmige, metallisch reflektierende Kristalle (Sr4TiP4 (grün), Sr4TiAs4 (silberfarben) Ba4TiP4 (silberfarben), Ba4TiAs4 (violett). Sie sind halbleitend und sehr empfindlich gegenüber Luft und Feuchtigkeit. Die Struktur ist eine hierarchische Variante vom Cr3Si- (A15) und KGe-Typ: Cr6Si2 ≙ (□Ge4K4)6(□Ge4K4)2 ≙ (TiX4M4)6(TiX4M4)2, in der die Ti-Atome die Positionen der Cr3Si-Struktur, die Erdalkalimetall- und Pnicogenatome die Positionen der KGe-Struktur besetzen. Ti ist deshalb von vier X-Atomen und von vier weiter entfernten M-Atomen in Form eines Heterokubans umgeben. Die mittleren Bindungslängen sind: d(Ti—P) = 238.0(5) pm, 307 ≤ d(Sr—P) ≤ 333 pm; d(T—As) = 245.9(4), 313 ≤ d(Sr—As) ≤ 341 pm; d(Ti—P) = 240.5(5), 324 ≤ d(Ba—P) ≤ 348 pm; d(Ti—As) = 248.3(3) pm, 331 ≤ d(Ba—As) ≤ 355 pm.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...