Page 1. Tcrrahdon Vol. 41. No. 7, pp. 1367 to 1372. 1985 Rmted in Great Bntam. ... A preliminary report on part of this work has already appeared: CW Bird and Y.-PS Chauhan, Tetrahedron Letters, 1978, 24, 2133. 1367 Page 2. 1368 JF &A0 et al. SCHEME 1 -- CL) (2) (3) (4) ...