Photodecomposition of chromium tricarbonyl complexes with styrene, stilbene, and 1,4-diphenylbuta-1,3-diene in solution
摘要:
Photolytic decomposition of styrene, stilbene, and 1,4-diphenylbuta-1,3-diene tricarbonyl chromium complexes in solution results in elimination of the carbonyl ligands and formation of binuclear alkenylarene chromium complexes. The quantum yields and activation and kinetic parameters of these processes were determined, and a scheme was proposed to rationalize photoinitiated transformations of the organochromium compounds under study.
Heterogeneous and homogeneous hydrogenation of styrene and stilbene chromium tricarbonyl complexes
作者:A. N. Artemov、E. V. Sazonova、D. S. Lomakin
DOI:10.1007/s11172-007-0008-1
日期:2007.1
stilbene chromiumtricarbonylcomplexes by molecular hydrogen on skeletal nickel and palladium on carbon as catalysts was studied. As compared to styrene and stilbene, their arene chromiumtricarbonyl analogs are hydrogenated considerably more slowly, which is related, most likely, to strong adsorption of the π-complexes on the catalyst surface. For the homogeneous hydrogenation of these complexes using
研究了以骨架镍和钯碳为催化剂的分子氢对苯乙烯和二苯乙烯三羰基铬配合物的多相加氢反应。与苯乙烯和二苯乙烯相比,它们的芳烃三羰基铬类似物的氢化速度要慢得多,这很可能与 π 络合物在催化剂表面的强吸附有关。为了使用 H2PtCl6-SnCl2-LiBr 系统均匀氢化这些配合物,苯乙烯和 η6-苯乙烯三羰基铬被高速还原,而二苯乙烯及其三羰基铬配合物被非常缓慢地氢化。显示了在作为催化剂的氯化钴 (II) 存在下硼氢化钠还原不饱和芳烃三羰基铬配合物的可能性。
作者:Ming‐Yang Wang、Wei‐Long Zeng、Lin Chen、Yu‐Fei Yuan、Wei Li
DOI:10.1002/anie.202403917
日期:2024.8.12
A novel dearomative carbonylation mode involving sequential nucleophile/nucleophile addition across benzene π-bonds enables the divergent synthesis of esters and amides by tolerating a broad spectrum of benzene derivatives, nucleophilic partners, alcohols, and amines. The versatility of the process further allows for the tunable synthesis of 1,3- or 1,4-cyclohexadienes and the construction of quaternary