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US 4,399,074 AGranted
Preparation of tertiary alkyl isocyanates
AssigneeAmerican Cyanamid Company
InventorFrederic C. Schaefer
Life of this patent
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Abstract
A process for the production of tertiary alkyl isocyanates, such as tetramethylxylylene diisocyanates, is disclosed in which the corresponding tertiary alkyl halide is reacted with an alkali metal cyanate utilizing a zinc-pyridine complex as a catalyst which has been prereacted with the cyanate before reaction with the halide.
Claims8
A process for production of a tertiary alkyl isocyanate from the corresponding tertiary alkyl halide which comprises:
- a. preparing a complex of a zinc salt of an acid selected from mineral acids and carboxylic acids and pyridine in a 1:2 mole ratio,
- b. thereafter reacting said zinc-pyridine complex with an alkali metal cyanate to form a zinc-pyridine-cyanate complex containing 2 equivalents of cyanate anion per atom of zinc, and
- c. reacting said zinc-pyridine-cyanate complex with said tertiary alkyl halide in an aprotic solvent at a temperature of from 0.degree. C. to 100.degree. C. to form said tertiary alkyl isocyanate.
Dependencies are inferred from the claim text.