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US 4,391,759 AGranted
Process for the preparation of organothioaldoxime compounds
AssigneeUnion Carbide Corporation
InventorJohn K. Chan
Life of this patent
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Abstract
An improved process for preparing 1-organothioaldoxime compounds by reacting an aldoxime or .alpha.-hydroxyiminoketone with an alkaline hypohalite in an acidic medium and reacting the resulting 1-haloaldoxime with the alkali metal salt of a mercaptan, said acidic medium comprising an acid added in an amount of from about 0.5 to about 4.0 equivalents for each mole of alkaline hypohalite used.
Claims22
A process for preparing an organothioaldoxime compound of the formula:
- ##STR3## by the steps of:
- (a) reacting an aldoxime of the formula:
- R.sub.1 CH.dbd.NOH
- or an .alpha.-hydroxyiminoketone of the formula:
- ##STR4## with an alkaline hypohalite in an acidic medium to form the corresponding 1-haloaldoxime, said acidic medium comprising an acid added in an amount of from about 0.5 to about 4.0 equivalents for each mole of alkaline hypohalite used;
- and
- (b) reacting said 1-haloaldoxime with an alkali metal mercaptide salt of the formula:
- R.sub.2 SM
- to form said organothioaldoxime compound, wherein the reactions of said steps (a) and (b) are conducted in an aqueous medium and wherein M denotes an alkali metal cation and R.sub.1, R.sub.2 and R.sub.3 are individually alkyl, alkoxyalkyl, cycloalkyl, phenyl or phenylalkyl, all of which may be either unsubstituted or substituted with one or more alkyl, halo, alkoxy, cyano, nitro or dialkylamino substituents.
6 more elements
Dependencies are inferred from the claim text.