Process for the preparation of sterically hindered hydroxybenzyl

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

1995-06-22

1997-04-08

McKane, Joseph

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

558214, C07F 940

Patent

active

056189630

ABSTRACT:
A process is described for the preparation of hydroxybenzylphosphonates of the formula I ##STR1## which involves A) reacting a phenol of the formula II ##STR2## with an amine of the formula III ##STR3## formaldehyde or paraformaldehyde and a protonic acid H.sub.n A to give a salt of the formula IV ##STR4## B) distilling off the water of reaction which forms, and C) reacting the reaction mixture, or the salt IV isolated therefrom, with a trialkyl phosphite of the formula ##STR5## in which H.sub.n A is an organic or inorganic acid having n protons,

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Derwent Abstract 73-63841U/43 of DE2312910 (1973).
Derwent Abstract 45359B/24 of SU-A 619-486 (1978).
V. V. Ovchinnikow et al. in Zh. Obshch Khim. 51,999 (1981).

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