Process for synthesis of azacycloalkane-2,2-diphosponic acids

Details Process for synthesis of azacycloalkane-2,2-diphosponic acids Process for synthesis of azacycloalkane-2,2-diphosponic acids

1989-03-10

1989-10-24

Shah, Mukund J.

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

540542, 546 21, 548412, C07F 930

Patent

active

048763390

ABSTRACT:
A reaction medium of ethanol condensed with 1-20, most preferably 4-6 moles, of ethylene or propylene oxide per mole of ethanol greatly improves the practicality of the preparation of azacycloalkane-2,2-diphosphonic acids of the general formula I: ##STR1## where R means a hydrogen or a lower alkyl radical with from 1 to 3 carbon atoms, and n means an integer between 3 and 11, by phosphonylating the corresponding lactams with phosphonic acid and phosphorous trihalides in the presence of water.

REFERENCES:
patent: 3945996 (1976-03-01), Conrad et al.
patent: 3988443 (1976-10-01), Ploger et al.
patent: 4108961 (1978-08-01), Ploger
patent: 4117090 (1978-09-01), Ploger
patent: 4150024 (1979-04-01), Syldatk et al.

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