Process for preparing benzene derivatives having isocyanatomethyl group
AssigneeKao Soap Co., Ltd.
InventorsYoshiaki Inamoto, Hisao Kitano, Yoshiaki Tanaka, Fumio Tanimoto, Atsushi Nishibata, Susumu Handa
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Abstract
A process for preparing benzene derivatives having an isocyanatomethyl group by reacting a benzene derivative having a chloromethyl group with sodium cyanate in dimethylformamide at 60.degree. to 160.degree.C., in the presence of a catalytic amount of an acidic metal chloride-dimethylformamide compound, made present in the reaction mixture from the start of the reaction by being dissolved in the starting reaction mixture.
Claims8
A process for preparing benzene derivatives having one or more isocyanatomethyl side chains, comprising the steps of:
- adding to liquid dimethylformamide having completely dissolved therein a catalytic amount of acidic metal chloride-dimethylformamide compound in which said acidic metal chloride moiety is selected from the group consisting of lithium chloride, copper chloride, beryllium chloride, magnesium chloride, calcium chloride, zinc chloride, aluminum chloride, silicon chloride, titanium chloride, zirconium chloride, vanadium chloride, chromium chloride, iron chloride, their corresponding oxychlorides and mixtures thereof, reactants consisting essentially of
- 1. a benzene derivative selected from the group consisting of chloromethylbenzene, bis-chloromethylbenzene, tris-chloromethylbenzene and nucleus-substituted derivatives thereof wherein the substituents are free of atoms of elements other than hydrogen, carbon, chlorine and oxygen, and
- 2.
A process according to claim 7, in which the amount of liquid dimethylformamide is from 1 to 10 moles, per mole of reactant (1).
Dependencies are inferred from the claim text.