| 摘要 |
Catalyst comprising phosphoranylidene derivatives giving a good yield with reduced catalyst residue in the product. Catalyst comprising phosphoranylidene derivatives giving a good yield with reduced catalyst residue in the product. Catalyst comprising phosphoranylidene derivatives of formulae (I)-(V) are claimed: R<1>, R<2> and R = alkyl, aryl, aralkyl or alkylaryl; R<4> and R<5> = alkyl, aryl, aralkyl or alkylaryl; R' = H, alkyl, aryl, aralkyl or alkylaryl; x = y.z; m<1> and m<2> = 2; and x' = 2.y'.z. An Independent claim is included for the preparation of polyorganosiloxanes by polycondensing/redistributing oligosiloxanes using a catalyst of formulae (I)-(V).
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