Compounds of the formula I
##STR1##
R.sub.1 and R.sub.2 independently of one another are C.sub.1 -C.sub.20
alkyl, OR.sub.11, CF.sub.3 or halogen; R.sub.3, R.sub.4 and R.sub.5
independently of one another are hydrogen, C.sub.1 -C.sub.20 alkyl,
OR.sub.1 or halogen; R.sub.6, R.sub.7, R.sub.8, R.sub.9 and R.sub.10
independently of one another are hydrogen, C.sub.1 -C.sub.20 alkyl;
C.sub.2 -C.sub.20 alkyl which is interrupted once or more than once by
nonconsecutive O atoms and which is unsubstituted or substituted by OH
and/or SH; or R.sub.6, R.sub.7, R.sub.8, R.sub.9 and R.sub.10 are
OR.sub.11, SR.sub.11, N(R.sub.12)(R.sub.13), phenyl or halogen; R.sub.11
is C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.8 cycloalkyl, phenyl, benzyl or
C.sub.2 -C.sub.20 alkyl which is interrupted once or more than once by O
or S and which is unsubstituted or substituted by OH and/or SH; R.sub.12
and R.sub.13 independently of one another are hydrogen, C.sub.1 -C.sub.20
alkyl, C.sub.3 -C.sub.8 cycloalkyl, phenyl, benzyl or C.sub.2 -C.sub.20
alkyl which is interrupted once or more than once by nonconsecutive O
atoms and which is unsubstituted or substituted by OH and/or SH; or
R.sub.12 and R.sub.13 together are C.sub.3 -C.sub.5 alkylene which can be
interrupted by O, S or NR.sub.14 ; R.sub.14 is hydrogen, phenyl, C.sub.1
-C.sub.12 alkyl or C.sub.2 -C.sub.12 alkyl which is interrupted once or
more than once by O or S and which is unsubstituted or substituted by OH
and/or SH; and M is hydrogen, Li, Na or K; are valuable intermediates for
the preparation of unsymmetrical bisacylphosphine oxides and
monoacylphosphine oxides.
Los compuestos del ## R.sub.1 y R.sub.2 del ## STR1 del fórmula I de uno otro son independientemente C.sub.1 - alkyl C.sub.20, OR.sub.11, CF.sub.3 o halógeno; R.sub.3, R.sub.4 y R.sub.5 de uno otro son independientemente hidrógeno, C.sub.1 - alkyl C.sub.20, OR.sub.1 o halógeno; R.sub.6, R.sub.7, R.sub.8, R.sub.9 y R.sub.10 de uno otro son independientemente el hidrógeno, C.sub.1 - alkyl C.sub.20; C.sub.2 - Alkyl C.sub.20 que es interrumpido una vez o más de una vez por los átomos nonconsecutive de O y que es sin sustituir o substituido por el OH y/o SH; o R.sub.6, R.sub.7, R.sub.8, R.sub.9 y R.sub.10 son OR.sub.11, SR.sub.11, N(R.sub.12)(R.sub.13), fenilo o halógeno; R.sub.11 es C.sub.1 - C.sub.20 alkyl, C.sub.3 - el cycloalkyl C.sub.8, fenilo, benzyl o C.sub.2 - el alkyl C.sub.20 que es interrumpido una vez o más de una vez por O o S y que es sin sustituir o substituido por el OH y/o SH; R.sub.12 y R.sub.13 de uno otro son independientemente hidrógeno, C.sub.1 - C.sub.20 alkyl, C.sub.3 - el cycloalkyl C.sub.8, fenilo, benzyl o C.sub.2 - el alkyl C.sub.20 que es interrumpido una vez o más de una vez por los átomos nonconsecutive de O y que es sin sustituir o substituido por el OH y/o SH; o R.sub.12 y R.sub.13 juntos son C.sub.3 - el alkylene C.sub.5 que se puede interrumpir por O, S o NR.sub.14; R.sub.14 es hidrógeno, fenilo, C.sub.1 - alkyl C.sub.12 o C.sub.2 - alkyl C.sub.12 que es interrumpido una vez o más de una vez por O o S y que es sin sustituir o substituido por el OH y/o SH; y M es hidrógeno, li, Na o K; son los intermedios valiosos para la preparación de los óxidos asimétricos del bisacylphosphine y de los óxidos del monoacylphosphine.
