((ethoxycarbonyl)ethylidene)triphenylphosphorane ; [(ethoxycarbonyl)ethylidene]triphenylphosphorane ; (carbethoxyethylidene)triphenylphosphorane ; propionic acid, 2- (triphenylphosphoranylidene)-, ethyl ester ; propanoic acid, 2- (triphenylphosphoranylidene)-, ethyl ester ; 1-(ethoxycarbonyl)ethylidenetriphenylphosphorane ; ethyl 2-(triphenylylidene)propanoate ; ethyl2- propionate ; ethyl 2-(triphenyl-$l5-phosphanylidene)propanoate ; 1h-imidazole, 2-ethyl-5-methyl- ; propanoic acid, 2-(triphenylphosphoranylidene)-, ethyl ester ; ethyl 2-(triphenylphosphoranylidene)propanoate ; (1-carboethoxyethylidene)triphenylphosphorane ; ethyl 2-(triphenyl-lambda5-phosphanylidene)propanoate ; (1-ethoxycarbonylethylidene)triphenyl phosphorane ; (1-ethoxycarbonylethylethylidene)triphenylphosporane ; 1-carboethoxyethylidenetriphenylphosphorane ; propionic acid, 2-(triphenylphosphoranylidene)-, ethyl ester ; 1-ethoxycarbonyl-ethyliden-phosphoran ; propanoic acid, 2-triphenylphosphoranylidene-, ethyl ester ; ethyl2-(triphenylphosphoranylidene)propionate ; (carbethoxyethylidene)triphenylphosphorane ; (1-ethoxycarbonylethylidene)triphenyl phosphorane ; 1-carbethoxyethylidene triphenylphosphorane ; 2-[ethylidene(diphenyl)phosphoranyl]benzoic acid ethyl ester ; (ethoxy carbonylethylidene)triphenylphosphorane ; ethyl 2-(triphenyl-lambda5-phosphanylidene)propanoate ; (carbethoxyethylidene)triphenylphosphorane ; 2-(triphenyl-lambda*5*-phosphanylidene)-propionic acid ethyl ester ; (1-ethoxycarbonylethylidene)triphenylphosphorane ; (ethoxycarbonylethylidene)triphenylphosphorane ; phosphonium, (1-carboxyethyl)triphenyl-, ethyl ester- ; ethyl 2-(triphenylphosphoranylidene)propionate ; (carbethoxyethylidine)triphenylphosphorane ; ethyl 2-(triphenyl-l5-phosphanylidene)propanoate