Multiple metal-carbon bonds. 38. Preparation of trialkoxymolybdenum(VI) alkylidyne complexes, their reactions with acetylenes, and the x-ray structure of Mo[C3(CMe3)2][OCH(CF3)2](C5H5N)2
作者:Laughlin G. McCullough、Richard R. Schrock、John C. Dewan、John C. Murdzek
DOI:10.1021/ja00307a025
日期:1985.10
Preparation des complexes MO(CCMe 3 )(CH 2 CMe 3 ) 3 , et des complexes Mo(CCMe 3 )X 3 (dme). Les acetylenes internes ne reagissent pas avec MO(CCMe 3 )(OCMe 3 ) 3 ; ils sont grandement polymerises par MO(CCMe 3 )(OCHMe 2 ) 3 et MO(CCMe 3 )(OCH 2 CMe 3 ) 3 . Structure cristalline
Stereochemically nonrigid tungsten alkylidene complexes. Barriers to rotation about the tungsten carbon double bond
作者:Jacky Kress、John A. Osborn
DOI:10.1021/ja00247a020
日期:1987.6
(5), Ph (6)), W(C-(CH2)3(CH2)OCH2-t-Bu)2Br2 (7), W(CH-t-Bu)(OCH2-t-Bu)3X (X = Cl (8), Br (9), I (10), W(CHR)(OCH2t-Bu)3Br (R = n-Bu (11), sec-Bu (12), Ph (13)), W(C(CH2)3CH2)(OCH2-t-Bu)3Br (14), and W(CH-t-Bu)(OCH2-t-Bu)4 (15) have been synthesized and studied by variable-temperature H NMR spectroscopy. The low temperature limiting spectra observed for all these compounds (except for 15) are consistent
7 kcal x mol ) 由围绕钨-碳双键的简单卡宾配体旋转组成。由于卡宾配体的正交取向在很大程度上不受轴向捐赠的影响,因此旋转势垒降低。更高能量的过程 (15.3, < G/sup double dagger/ < 18.9 kcal x mol ) 由所有三个新戊酮基团的加扰组成,但它并不特定于卡宾配合物。
Synthesis and Reactivity of a Polycyclic, Oxa-Bridged Phosphaalkene
3-diphenylindenone 2,3-epoxide (1) in the presence of tert-butylphosphaalkyne (3) proceeds through a regiospecific 1,3-dipolar cycloaddition of the phosphaalkyne to the carbonyl ylide intermediate to furnish the polycyclic phosphaalkene derivative 4. Compound 4 exhibits a remarkable −− and for phosphaalkenes unusual −− stability: thus, it can be stored for several days and no decomposition can be observed even in the
Generalized synthesis of pentaco-ordinated tungsten(IV) carbene complexes
作者:A. Aguero、J. Kress、J. A. Osborn
DOI:10.1039/c39850000793
日期:——
General methods enabling the synthesis of a large variety of pentaco-ordinatetungsten(IV) carbenecomplexes are described permitting notably the isolation of the first unsaturated (<18e) metal carbenes containing β-hydrogens.