Process for the preparation of sterically hindered...

Details Process for the preparation of sterically hindered... Process for the preparation of sterically hindered...

C - Chemistry, Metallurgy

07

F

C07F 9/40 (2006.01)

Patent

CA 2065087

A process for the preparation of hydroxybenzylphosphonates of formula Image by reacting a Mannich base of formula Image with a trialkyl phosphite of formula Image wherein R1 and R2 are each independently of the other C1-C12alkyl or C5- C7cycloalkyl, R3 and R4 are each independently of the other C1-C12alkyl or, when taken together, form a piperidinyl or morpholinyl radical, and R5, R6 and R7 are each independently of one another C1-C4alkyl, which reaction is carried out in the presence of a carboxylic anhydride (IV). The compounds of formula I may suitably be used as processing stabilisers for plastics.

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