Die Umsetzung der β‐Bromketone (I) und (IV) mit Trimethylsilyl‐diphenylphosphin (II) führt zu den Hydrobromiden der β‐Ketophosphine (IIIa) bzw. (IIIb), die durch NaOH‐Bef handlung quantitativ in die HBr‐freien Ketone (IIIc) umwandelbar sind.

1-Diphenylphosphinopropan-2-on-hydrobromide (1a), 2-Diphenylphosphino-1-phenylethan- 1-on-hydrobromide (2a), and 1,3-Bis(diphenylphosphino)propan-2-on-bis(hydrobromide) (3a) were prepared by the reaction of the corresponding β-bromo-ketones with diphenyl(trimethylsilyl)phosphine. By treatment with NaOH the hydrobromides 1a-3a were converted into the ketones 1b-3b. The reactions of 1a-3a with (R)-(+)-1-phenylethylamine were investigated.