Organometallic monoacylalkylphosphines, their preparation and their use as starting in the preparation of products phosphines their oxides or their sulphides.

The invention relates to compounds of formula I cyclohexyl, naphthyl, biphenyl or a heterocyclic 5- or 6-membered ring containing O, S or N; R1 and R2 are C1-C20 alkyl, OR11, CF3 or halogen; R3, R4 and R5 are H, C1-C20 alkyl, OR11 or halogen; R6 is C1-C24 alkyl, C2-C24 interrupted by O, S or NR14; C2-C24, interrupted or not by O, S or NR14; arylalkyl, C7-C24; cycloalkyl, C4-C24, interrupted or not by O, S and / or NR 14; arylcycloalkyl or C 8 -C 24; R11 is C1-C20 alkyl, C3-C8, phenyl, benzylz alkyl or C2- C20, interrupted by O or S; R12 and R13 sint H, C1-C20 alkyl, C3-C8, phenyl, benzyl or C2-C20, interrupted by O; or R12 and R13 together are alkylene, C3-C5, interrupted or not by O, S or NR14; R14 is H, phenyl, C1-C12 alkyl or C2-C12alkyl interrupted by O or S; and M is H, Li, Na or K.