A process for the preparation of hydroxybenzylphosphonates of forula ##STR1## by reacting Mannich base of formula ##STR2## with as trialkyl phosphite of formula ##STR3## wherein R.sub.1 and R.sub.2 are each independently of the other C.sub.1 -C.sub.12 alkyl or, when taken together form a piperidinyl or morpholinyl radical, and R.sub.5, R.sub.6 and R.sub.7 are each independently of one another C.sub.1 -C.sub.4 alkyl, which reaction is carried out in the presence of a carboxylic anhydride (IV). The compounds of formula I may suitably be used as processing stabilizers for plastics.
一种制备式为##STR1##的羟基苯
甲基膦酸酯的方法,通过将式为##STR2##的Mannich碱与式为##STR3##的三烷基
膦酸酯反应,其中R.sub.1和R.sub.2各自独立地为C.sub.1-C.sub.12烷基,或者当它们一起形成
哌啶基或
吗啡啉基时,而R.sub.5、R.sub.6和R.sub.7各自独立地为C.sub.1-C.sub.4烷基,在存在
羧酸酐(IV)的情况下进行反应。式I的化合物可适用于塑料的加工稳定剂。