Abstract Three new C, C-dichlorophosphaalkenes RP= CCl2 18–20 have been synthesized from the corresponding dichlorophosphines RPCl2 11–13. Compounds 18–20 are stabilized owing to the use of the very bulky new groups R1 [2, 6-bis (4-methylphenyl)-4- methylphenyl] and R3 [2, 6-bis (2-methoxyphenyl)-4-methylphenyl] and the known 2, 6- dimesityl-4-methylphenyl (R2). The compounds with a R3 group (R3I: 4, R3PCl2: 13, ...
