Room temperature <i>Z</i>-selective hydrogenation of alkynes by hemilabile and non-innocent (NNN)Co(<scp>ii</scp>) catalysts
作者:Dipesh M. Sharma、Chandrakant Gouda、Rajesh G. Gonnade、Benudhar Punji
DOI:10.1039/d2cy00027j
日期:——
Hemilabile and phosphine-free quinolinyl-based NNN-type pincer and non-pincer cobalt complexes were developed for the room temperature catalytic transfer semi-hydrogenation of alkynes to Z-alkenes. Treatment of the quinolinyl-amine ligand, [C9H6N(NH)CH2CH2NEt2] (QNNNCH2NEt2)–H with CoX2 afforded the pincer complexes κ3-(QNNNCH2NEt2)CoX2 (X = Cl, Br), whereas, the quinolinyl-amide ligand, [C9H6N(NH)C(O)CH2NEt2]
Hemilabile 和无膦喹啉基 NNN 型钳形和非钳形钴配合物被开发用于室温催化转移半氢化炔烃到Z-烯烃。喹啉胺配体 [C 9 H 6 N(NH)CH 2 CH 2 NEt 2 ] ( Q NNN CH 2 NEt 2 )–H 用 CoX 2处理得到钳形复合物 κ 3 -( Q NNN CH 2 NEt 2 )CoX 2 (X = Cl, Br),而喹啉基-酰胺配体,[C 9 H6 N(NH)C(O)CH 2 NEt 2 ] ( Q NNN C(O)NEt 2 )–H 得到螯合阴离子配合物 κ 2 -( Q NN)CoX 2 (N C(O)HNEt 2 ) (X = 氯,溴)。定义明确的阴离子非钳形钴配合物有效地催化多种炔烃的半氢化,从而在室温下提供高度化学选择性和立体发散的Z-烯烃。这种加氢反应具有广泛的底物范围和对敏感官能团的耐受性,如-Cl、-Br、-I、-OH、-NH 2、-COOMe