Le Premier compose du titre cristallise dans le systeme monoclinique avec le groupe d'espace P2 1 /c。Le second cristallise dans le systeme monoclinique avec le groupe d'espace P2 1 /n。Affinement de la structure jusqu'a 3,5% 和 2,9% 分别
Tungsten (IV) carbenes for the metathesis of olefins. Direct observation and identification of the chain carrying carbene complexes in a highly active catalyst system
作者:Jacky Kress、Marcel Wesolek、John A. Osborn
DOI:10.1039/c39820000514
日期:——
On addition of aluminium halides to the carbenecomplexes W(CHBut)(OCH2But)2X2 conversion into highly active catalysts for olefinmetathesis occurs; the nature of the initiating and propagating species in olefinmetathesis has been identified by n.m.r. spectroscopy.
将卤化铝加到卡宾络合物W(CHBu t)(OCH 2 Bu t)2 X 2上,转化为用于烯烃复分解的高活性催化剂。核磁共振研究中已经确定了烯烃复分解中引发和繁殖物质的性质。
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。
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.
Tungsten carbene complexes in olefin metathesis: a cationic and chiral active species
作者:Jacky Kress、John A. Osborn
DOI:10.1021/ja00358a044
日期:1983.9
On etudie la formation d'un nouveau complexe W(=CRH)(OCH 2 R) 2 Br + Ga 2 Br 7 − et on utilise ce complexe pour catalyser la metathese du cis-pentene-2
在 etudie la形成 d'un nouveau complexe W(=CRH)(OCH 2 R) 2 Br + Ga 2 Br 7 − 等上使用ce complexe pour catalyser la metathese du cis-pentene-2
First direct observation of the simultaneous presence and of the interconversion of chain-propagating metal-carbene and metallacyclobutane complexes in a catalytic olefin metathesis reaction: the ring-opening polymerization of norbornene
作者:J. Kress、J. A. Osborn、R. M. E. Greene、K. J. Ivin、J. J. Rooney