... d) FA Davis, LC Vishwakarma; Tetrahedron Lett., 26 (1985), p. 3539. ... b D. Enders, P. Fey, H. Kipphardt; Org. Synth., 65 (1987), p. 173. c D. Enders, P. Fey, H. Kipphardt; Org. Synth., 65 (1987), p. 183. d D. Enders, B.Bhushan Lohray; Most recent application Angew. Chem., 99 (1987), p. 359. e D. Enders, B.Bhushan Lohray; Angew. Chem. Int. Ed. Engl., 26 (1987), p. 351. ...