Chemistry of carbon compounds – Dipeptides – e.g. – aspartame – anserine – carnosine – etc.
Patent
1974-07-26
1976-06-08
Raymond, Richard L.
Chemistry of carbon compounds
Dipeptides, e.g., aspartame, anserine, carnosine, etc.
260 4595D, 260927R, 260928, 260929, 260937, 260948, 260950, C07F 940
Patent
active
039623777
ABSTRACT:
The compounds are trialkylsubstituted hydroxybenzylphosphonates and phosphinates having the formula ##SPC1##
Wherein R, R.sup.1 and R.sup.2 are independently lower alkyl or cycloalkyl groups, R.sup.3 is alkyl, alkyl substituted with one halogen atom, phenyl, phenyl substituted with alkyl groups, alkoxy, alkoxy substituted with one halogen group, phenoxy, phenoxy substituted with alkyl groups, alkylthioethoxy, alkylpolyoxyalkylenoxy, R.sup.4 is alkyl, alkylsubstituted with one halogen atom, cycloalkyl, phenyl, phenyl substituted with alkyl groups alkylthioethyl, thiobis-alkylene, alkyleneoxyalkylene, polyoxyalkylene, alkylpolyoxyalkylene, alkylene, polyvalent cyclic or acyclic hydrocarbon radical, R.sup. 5 and R.sup. 6 are independently hydrogen, alkyl of 1 to 12 carbon atoms, R.sup.6 may also be the group Ic ##SPC2##
Or together R.sup.5 and R.sup.6 represent the group Id ##SPC3##
R.sup.7 is hydrogen, alkyl or phenyl, A is lower alkylene and n is 1 to 4.
These compounds are usually prepared by reacting the trialkylsubstituted hydroxybenzyl or hydroxyphenylalkyl halide with the appropriate trialkyl or triaryl phosphite or appropriate substituted phosphonite.
The compounds are useful as stabilizers of organic materials subject to oxidative, thermal and photochemical degradation.
REFERENCES:
patent: 3006945 (1961-10-01), Goddard et al.
patent: 3281505 (1966-10-01), Spivack
patent: 3742096 (1973-06-01), Spivack
patent: 3769372 (1973-10-01), Spivack
patent: 3790648 (1974-02-01), Schmidt et al.
patent: 3839506 (1974-10-01), Hechenbleikner et al.
Derwent Japanese Patents Report, 6, No. 3, p. 1:4, 1037/67, (2-28-67).
Ciba-Geigy Corporation
Hall Luther A. R.
Raymond Richard L.
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