Vicinal Diboration of Alkyl Bromides via Tandem Catalysis
作者:Xiao-Xu Wang、Lei Li、Tian-Jun Gong、Bin Xiao、Xi Lu、Yao Fu
DOI:10.1021/acs.orglett.9b01481
日期:2019.6.7
Vicinal diboration of alkylbromides via tandem catalysis is reported. The reported reaction exhibits a broad substrate scope, good functional group compatibility, and regioselectivity. Moreover, it shows good practicality due to the easy accessibility of alkylbromides in combination with diverse transformations of diboronates. Mechanism study indicates that terminal alkenes are generated selectively
Constituents of cigarette smoke. Part X. Evidence for 1,5-hydrogen transfer in the formation of non-conjugated isoprenoid polyolefins during pyrolysis
作者:D. L. Dare、I. D. Entwistle、R. A. W. Johnstone
DOI:10.1039/j39680000977
日期:——
major group of compounds present in cigarettesmoke condensate are the polyolefins (I) which are not present in fresh or cured tobacco leaf. Studies on deuterium-labelled model olefins have provided evidence for specific 1,2- and 1,5-migrations of hydrogen at temperatures in the range 300–400° and suggest the role of a similar mechanism in the formation of the polyolefins (I).
The selective cross-coupling of activated electrophiles with unactivated ones has been regarded as a challenging task in cross-electrophile couplings. Herein we describe a migratory cross-coupling strategy, which can overcome this obstacle to access the desired cross-coupling products. Accordingly, a selective migratory cross-coupling of two alkyl electrophiles has been accomplished by nickel catalysis