Phosphorus ylide (R₃P=CHR') reacts with an aldehyde or ketone to give an alkene and triphenylphosphine oxide (Ph₃P=O). Proceeds via a betaine/oxaphosphetane intermediate; Z/E selectivity controlled by ylide stabilisation (stabilised → E,…
Phosphorus ylide (R₃P=CHR') reacts with an aldehyde or ketone to give an alkene and triphenylphosphine oxide (Ph₃P=O). Proceeds via a betaine/oxaphosphetane intermediate; Z/E selectivity controlled by ylide stabilisation (stabilised → E,…