stereoselectivity noun1 •The condition of being stereoselective or a measure of the extent to which a reaction is stereoselectiveAldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich The stereoselectivity that occurs in these vinylcarbenoid cyclopropanations results in a strong preference for the formation of cis-divinylcyclopropanes. formsstereoselectivities