Back to results
US 4,229,364 AGranted
Synthesis of 1,4-bis(dicyanomethylene) cyclohexane
AssigneeThe Procter & Gamble Company
InventorRobert J. Crawford
Life of this patent
Estimating the term…
Abstract
1,4-Bis(dicyanomethylene)cyclohexane is the chemical of choice for the synthesis of TCNQ. The present invention provides a simple convenient, three-step synthesis of 1,4-bis(dicyanomethylene)cyclohexane from hydroquinone which uses water as the reaction solvent.
Claims6
A process for the preparation of 1,4-bis(dicyanomethylene)cyclohexane, comprising the steps:
- I. hydrogenating hydroquinone to provide 1,4-cyclohexanediol;
- II. oxidizing the 1,4-cyclohexanediol from Step (I) in the presence of a ruthenium catalyst to provide 1,4-cyclohexanedione;
- and
- III. condensing the 1,4-cyclohexanedione from Step (II) with two equivalents of malononitrile
- said steps (I), (II) and (III) each being carried out in water as the reaction solvent.
2 more elements
Dependencies are inferred from the claim text.