Method for producing onium salts with dialkyl phosphonate anions with low halogenide content

摘要

Preparation of onium salts with dialkyl phosphate-, dialkyl phosphinate-, (O-alkyl)-alkyl- or alkyl-phosphonate-anions comprises reacting an onium halogenide with a phosphoric acid trialkyl ester, a dialkyl phosphinic acid alkyl ester, an alkyl phosphonic acid alkyl ester, a trialkyl silyl ester or a mixed alkyl-trialkyl silyl ester of the phosphorus-, dialkyphosphinic- or alkyl phosphonic acid. An independent claim is also included for trialkyl silyl ester compounds of formula (C 2F 5) 2P(O)OSi(alkyl) 3, (C 3F 7) 2P(O)OSi(alkyl) 3 or (C 4F 9) 2P(O)OSi(alkyl) 3, where the alkyl group of the trialkyl silyl group contains 1-4C.