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US 4,902,833 AGranted
Bisphosphine dioxides
AssigneeUnion Carbide Chemicals and Plastics Company Inc.
InventorKenneth G. Moloy
Life of this patent
Estimating the term…
Abstract
A process for the production of organic bisphosphine dioxides from organic bisphosphonates. The organic bisphosphonate is reacted with a Grignard reagent to give relatively high yields of the organic bisphosphine dioxide.
Claims15
A process for the production of an organic bisphosphine oxide of the general formula:
- ##STR7## which consists of reacting an organize bisphosphonate of the general formula:
- ##STR8## under essentially anhydrous conditions with from at least one to about six molar equivalents of a reagent of the general formula:
- R'MX (III)
- and recovering said organic bisphosphine oxide;
- wherein R is an alkyl group having from 1 to about 10 carbon atoms;
- R' is an aryl or aralkyl or alkaryl group having 6 to 10 ring carbon atoms in the aryl-moiety and from 1 to about 10 carbon atoms in the alk-moiety;
- Z is a divalent alkylene or alkenylene group having from 1 to about 10 carbon atoms, or a divalent cyclic bridging group having from 4 to about 10 ring carbon atoms;
- M is a metal atom from the group consisting of Mg or Zn or Al;
- and X is a halogen atom.
6 more elements
Dependencies are inferred from the claim text.