N,N-Dialkylureidomethane diphosphonic acid and its preparation

Details N,N-Dialkylureidomethane diphosphonic acid and its preparation N,N-Dialkylureidomethane diphosphonic acid and its preparation

1979-07-19

1981-03-10

Daus, Donald G.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

548112, 2605025, 252180, C07F 938, C07F 965, C02B 506

Patent

active

042555728

ABSTRACT:
Novel N,N'-dialkylureidomethane diphosphonic acids and their alkaline salts having the formula: ##STR1## wherein R.sub.1 and R.sub.2 represent separate alkyl groups having 1 to 3 carbons or a ring forming alkylene group and R is hydrogen or an alkali metal; a novel method for their preparation comprising reacting formic acid with a corresponding N,N'-dialkylurea and phosphorus trichloride and the use of such compounds to prevent the formation of calcareous deposits in water systems.

REFERENCES:
patent: 3763281 (1973-02-01), Weil
patent: 3957160 (1976-05-01), Ploger et al.
patent: 3989727 (1976-11-01), Birum
patent: 4003965 (1977-01-01), Birum
patent: 4098814 (1978-07-01), Sommer et al.
patent: 4157364 (1979-06-01), Buckman et al.

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