... Tetrahedron. Volume 59, Issue 25, 16 June 2003, Pages 4673–4685. ... Emmons condensation between diethylbenzyl phosphonate and ketones 25 or 26 (Scheme 7). Hydrazones 35 and 36 were prepared by the condensation of 1,1-diphenylhydrazine with ketones 25 and 26 ...