Abstract: 3-Ethyl-3, 5-dimethyl-l, l-diphenyl-l, 4-hexadiene was shown to undergo the di-7r- methane rearrangement. Both cis and trans stereoisomers of 3-ethyl-3-methyl-2-(2'- methylpropenyl)-l, I-diphenylcyclopropane were obtained as photoproducts. This system was used to investigate the stereochemistry of the di-7r-methane rearrangement, since the methane carbon is asymmetric. Also both cis-and rrans-vinylcyclopropane photoproducts ...
