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Facile synthesis of symmetric esters of alkylenebisphosphonic acids

Abstract: A facile synthesis of symmetric esters of C1-C10 alkylenebisphopsphonic acids is disclosed in which a C1-C10 alkylenebis(phosphonic dichloride) is reacted with an alcohol in the presence of a catalytic amount of 1H-tetrazole and a base in an aprotic solvent to form a first reaction mixture. The first reaction mixture is maintained for a time period sufficient to form a C1-C10 alkylenebis(chloro ester phosphonate) that is reacted under basic conditions with an excess of a hydroxylated compound to form a second reaction mixture that is itself maintained for a time period sufficient to form a C1-C10 alkylenebis(ester phosphonate) partial ester, homoleptic tetraester or mixed tetraester. The material so formed can be recovered or used as is. ...

USPTO Applicaton #: #20050234257 - Class: 558070000 (USPTO) - Class 558

Related Patent Categories: Organic Compounds -- Part Of The Class 532-570 Series, Azo Compounds Containing Formaldehyde Reaction Product As The Coupling Component, Phosphorus Esters (i.e., Compounds Having The Phosphorus Ester Group, Wherein Trivalent Or Pentavalent Phosphorus And Carbon Are Bonded Directly To The Same Divalent Chalcogen, And Wherein The Carbon May Be Single Bonded To Any Atom But May Be Multiple Bonded Only To Carbon)
The Patent Description & Claims data below is from USPTO Patent Application 20050234257, Facile synthesis of symmetric esters of alkylenebisphosphonic acids.

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