ethyl 4-(triphenylphosphoranylidene)-(2E)-2-butenoate

(2,2-bis(ethylthio)vinyl)triphenylphosphonium

4-phenyl-3,3,6,6-tetramesityl-1,2,3,6-dioxadigermine

triphenylphosphonium-(diethoxyphosphinyl)ferrocenylmethylide