Patent ID: 8344152
Filing Date: 2013-01-01
Classification: C07C,C07D

Abstract:
1. A process for producing pyridylethanethiol by a process comprising a first process as defined in step (1): (1) producing vinylpyridine by subjecting picoline and formaldehyde to methylolation reaction to produce pyridyl ethanol, and then subjecting the pyridyl ethanol to a dehydration reaction in the presence of an alkali; and a second step selected from any one of the following steps (2) to (4): (2) reacting vinylpyridine with thiourea as a sulfur-containing compound in the presence of an acid to obtain an isothiuronium salt, and decomposing said isothiuronium salt in the presence of an alkali to convert it into pyridylethanethiol; (3) reacting vinylpyridine with thioacetic acid as a sulfur-containing compound to obtain pyridylethyl thioacetate, and decomposing said pyridylethyl thioacetate in the presence of an acid to convert it into pyridylethanethiol; and (4) reacting vinyl pyridine with hydrogen sulfide as a sulfur-containing compound to obtain pyridylethanethiol, wherein in the process said vinyl pyridine comprises, as an impurity, isopropenyl pyridine, and wherein in the process isopropenyl pyridine as the impurity is removed by distillation of said vinyl pyridine so that a content of isopropenyl pyridine in said vinyl pyridine is not more than 4% by weight.