G. Hilt, W. Hess, K. Harms
2008
Citations
0
Influential Citations
12
Citations
Journal
Synthesis
Abstract
The cobalt-catalyzed [2+2+2] cycloaddition of two alkynes and a 1,3-diene, utilizing either a dibromo[1,2-bis(diphen-ylphosphino)]benzene cobalt or a dibromobis(triphenylphosphino)cobalt complex, under reductive conditions gives vinyl-substituted cyclohexa-1,3-diene derivatives in acceptable yields. The oxidation of 5-methyl-1,4-diphenyl-5-vinylcyclohexa-1,3-diene by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone leads to a rearrangement resulting in a vinyl-terphenyl derivative.