Ok. Kim et al., STEREOSELECTION IN THE CHROMIUM-MEDIATED INTRAMOLECULAR [2+2] CYCLOADDITIONS OF VINYL KETENES AND ALKENES, Journal of organic chemistry, 58(21), 1993, pp. 5571-5573
The first study of the relative diastereoselectivity of the intramolec
ular [2 + 2] cycloadditions of alkenes and vinyl ketenes generated fro
m the reactions of carbene complexes with chiral enynes is reported.