Chemistry of carbon compounds – Dipeptides – e.g. – aspartame – anserine – carnosine – etc.
Patent
1983-11-23
1985-10-29
Sutto, Anton H.
Chemistry of carbon compounds
Dipeptides, e.g., aspartame, anserine, carnosine, etc.
260962, C07F 946
Patent
active
045499950
ABSTRACT:
The disclosure relates to an improved process for making alkanephosphonous acid esters which comprises: introducing a stoichiometric excess each of an alkyldihalogenophosphane and aliphatic alcohol into a reaction column and reacting them therein at a temperature higher than the boiling point of the reactants but lower than the boiling point of the resulting alkanephosphonous acid ester, this latter being obtained in the base portion of the reaction column and being removed therefrom; continuously expelling overhead of the reaction column a vaporous mixture consisting of by-products formed during the reaction, in the form of hydrogen halide and halide of the aliphatic alcohol, together with aliphatic alcohol in excess, and separating the mixture into its components in a series-connected distilling column, the aliphatic alcohol obtained in the base portion of the distilling column being removed therefrom and recycled into the reaction column, and selectively condensing the mixture issuing overhead with recovery of hydrogen halide gas and liquefied halide of the aliphatic alcohol.
REFERENCES:
patent: 2722538 (1955-11-01), Jackson
patent: 2903475 (1955-09-01), Harowitz
Arbuzov et al., "Chem. Abstracts", vol. 47, (1953), #9904c.
Auer Eberhard
Gehrmann Klaus
Ohorodnik Alexander
Rosenthal Johannes
Hoechst Aktiengesellschaft
Sutto Anton H.
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