Compounds of the formula I
##STR1##
(I), in which
Ar is a group
##STR2##
or unsubstituted or substituted cyclopentyl, cyclohexyl, naphthyl, biphenylyl
or an O-, S- or N-containing 5- or 6-membered heterocyclic ring; R1
and R2 are C1-C20alkyl, OR11, CF3
or halogen; R3, R4 and R5 are hydrogen,
C1-C20alkyl, OR11 or halogen; R6 is
unsubstituted or substituted C1-C24alkyl, C2-C24alkyl,
which is interrupted by O, S or NR14 and is unsubstituted or substituted;
C2-C24alkenyl, uninterrupted or interrupted by O, S or NR14
and unsubstituted or substituted; unsubstituted or substituted C7-C24arylalkyl;
C4-C24cycloalkyl, uninterrupted or interrupted by O, S and/or
NR14; or C8-C24arylcycloalkyl; R11 is
C1-C20alkyl, C3-C8cycloalkyl, phenyl,
benzyl or C2-C20alkyl, interrupted by O or S and unsubstituted
or substituted; R12 and R13 are hydrogen, C1-C20alkyl,
C3-C8cycloalkyl, phenyl, benzyl or C2-C20alkyl,
interrupted by O atoms and unsubstituted or substituted; or R12 and
R13 together are C3-C5alkylene, uninterrupted
or interrupted by O, S, or NR14; R14 is hydrogen, phenyl,
C1-C12alkyl or C2-C12alkyl, interrupted
by O or S and unsubstituted or substituted; and M is hydrogen, Li, Na or K; are
valuable intermediates for the preparation of unsymmetrical bisacylphosphine oxides
and monoacylphosphine oxides.
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