Ranu, Brindaban C.; Mandal, Tanmay; Samanta, Sampak Organic Letters, 2003 , vol. 5, # 9 p. 1439 - 1441 Ranu, Brindaban C.; Mandal, Tanmay Journal of Organic Chemistry, 2004 , vol. 69, # 17 p. 5793 - 5795