1,Hamanaka. N, Kosuge. S, Iguchi. S, synlett, 1990, 139 2,Corre. M. L, Hercouet. A, Baron. H. L, New synthesis of indoles from o-acylaminobenzyl-triphenyl-phosphonium salts, J. Chem. Chem. Common, 1981, 14-15 3,Murphy, P. J.; Brennan,For a recent review of Wittig reactions of carbonyl compounds other than aldehydes and ketones, J. Chem. SOC Rev. 1988, 17, 1.