PROCESS FOR THE PREPARATION OF BIS(ACYL)PHOSPINIC ACID SYLYL ESTERS

The present invention refers to a process for the preparation of a bis(acyl)phosphinic acid silyl ester of the general formula (I), wherein R1, R2, R3, R4, R5, R7, R8, R9, R10 and R11 are the same or different and are independently selected from H, halogen, linear or branched C1-C20-alkyl, linear or branched C2-C8-alkenyl, C1-C8-alkoxy, C2-C8-alkenyloxy, C3-C8-cycloalkyl, C6-C12-aryl, C3-C8-cycloalkoxy, C7-C12-arylalkoxy, C9-C15-alkenylarylalkoxy, nitro-, C6-C12-arylsulfonyl, 4-alkylarylsulfonyl, C1-C20-alkylcarboxy, C1-C8-alkoxycarbonyl, SR12, NHR12 or NR12R13 with R12 and R13 being independently selected from H, linear or branched C1-C20-alkyl, linear or branched C2-C8-alkenyl and C3-C8-cycloalkyl, and an O-, S- or N- containing 5- or 6-membered heterocyclic ring; R6 is OSiR14R15R16 with R14, R15 and R16 being independently selected from linear or branched C1-C20-alkyl or C6-C12-aryl; as well as the bis(acyl)phosphinic acid silyl ester and the bis(acyl)phosphinic acid obtained by the process.