Chemistry of carbon compounds – Dipeptides – e.g. – aspartame – anserine – carnosine – etc.
Patent
1974-08-05
1976-06-22
Raymond, Richard L.
Chemistry of carbon compounds
Dipeptides, e.g., aspartame, anserine, carnosine, etc.
260 25AJ, 260 25AR, 260 457P, 260927R, 260978, 260982, 260983, 260990, C07F 909, C07F 940
Patent
active
039652173
ABSTRACT:
Stabilized products which are phosphorus containing oligomers having ##EQU1## linkages between phosphorus atoms and which are obtained by the self-condensation of .beta.-haloalkyl esters of pentavalent phosphorus acids or the condensation products of these esters with an alkyl ester of a pentavalent phosphorus acid are formed by terminating the condensation reaction when it is about 35-75% complete, said condensation being performed in the absence of a nucleophilic initiator, such as a sodium salt initiator. The lower degree of condensation in the product and the absence of the nucleophilic initiator during the condensation reaction, is responsible for the lesser degree of scorching in a polyurethane foam containing the product as compared to one which is formed by allowing the condensation reaction go to completion or by use of a nucleophilic initiator during the condensation. If desired, the final product can be post-treated with an alkylene oxide and/or water or alcohol or by extraction with an inert organic solvent.
REFERENCES:
patent: 3641202 (1972-02-01), Biranowski et al.
patent: 3755359 (1974-12-01), Weil
patent: 3822327 (1974-07-01), Weil
patent: 3896187 (1975-07-01), Weil
Shim Kyung S.
Walsh Edward N.
Fennelly Richard P.
Raymond Richard L.
Stauffer Chemical Company
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