作者:Sam Yruegas、Scott P. Semproni、Paul J. Chirik
DOI:10.1021/acs.organomet.1c00688
日期:2022.11.28
Disubstituted diazoalkanes, diphenyldiazomethane and 9-diazofluorene, also yielded the olefin as the major product along with minor azine coupling. Investigations into the nature of the diazoalkane–cobalt interaction by multinuclear NMR spectroscopy and X-ray diffraction established end-on diazoalkane cobalt complexes as the resting states. The isolated four-coordinate cobalt diazoalkane complexes promoted
向钳形负载的钴 (I) 二氮络合物 ( tBu mPNP)CoN 2 ( tBu mPNP = modified 2,6-bis[(di tert -butylphosphino )methyl]pyridine) 添加过量的重氮烷导致催化形成同源偶联伴随 N 2损失的烯烃产物。单取代的重氮烷烃、三甲基甲硅烷基重氮甲烷和甲苯基重氮甲烷以定量收率生成烯烃产物,具有独特的 ( E)-立体选择性。二取代的重氮烷烃、二苯基重氮甲烷和 9-重氮芴也产生作为主要产物的烯烃以及少量吖嗪偶联。通过多核 NMR 光谱和 X 射线衍射对重氮烷-钴相互作用的性质进行研究,建立了重氮烷钴络合物作为静止状态。孤立的四配位钴重氮烷络合物促进转化为相应的烯烃。( tBu mPNP)CoN 2与 α-重氮-β-酮酯的反应导致形成五配位 Co(I)-重氮烷络合物,其螯合酯单元对烯化反应不活跃。