Ring contraction of 2-alkylidenecyclobutanols to cyclopropyl carbonyl compounds
Abstract
2-Alkylidenecyclobutanols when heated in a sealed tube or in 5% H2SO4 undergo ring contraction to 1-alkylcyclopropyl carbonyl compounds; subsequent rearrangement into homoallylic carbonyl derivatives occurs when 1,5 hydrogen transfer is possible.