... c W. Kirmse, K.-H. Pook; Chem. Ber., 98 (1965), p. 4022. d J. Warkenton, E. Singleton, JF Edgar; Can. J. Chem., 43 (1965), p. 3456. ... Can. J. Chem., 44 (1966), p. 621. ... 5; a S. Siegel, CG Bergstrom; Other routes to cyclopropyl esters include addition of either diazoalkanes J. Am. Chem. Soc., 72 (1950), p. 3815. Full Text via CrossRef. b C. Kaiser, BM Trost, J. Beeson, J. Weinstock; or sulfoxonium ylides J. Org. Chem., 30 (1965), p. 3972 to α,β-unsaturated esters. ...