Carbamic acid chloride

Hydroxypyridine Dimethyl carbamic acid chloride Methyl bromide... 

Methods of acylating pyrrole similar to the present one have been reported using oxalyl chloride,5 trifluoroacetic anhydride,6 carbamic acid chloride,7 and trichloroacetyl chloride.8 In the last preparation, it was necessary to separate the product from highly colored by-products by alumina chromatography. Pyrrol-2-yl trichloromethyl ketone has also been prepared by the interaction of pyrrolylmagnesium halide and trichloroacetyl chloride.9... 

An intimate mixture of diphenyl and carbamic acid chloride-A Gl3 addition compound warmed to 60-70°, and, after subsiding of the re-... 

The reaction of 3-amino-6-chloropyridazine (55) with either Y-(phenylchloromethylene)carbamic acid chloride or benzoyl isocyanide dichloride formed 2-phenylpyridazino[2,3-a][l,3,5]triazine-4-one (56) in moderate yield (Equation (9)) <72JOC2960>. Substituted aminopyridazines on reaction... 

The free acids are not known although their formation from isocyanic or isothiocyanic acid and one mole of a hydrogen halide can be visualized. While the esters of isocyanic acid, the isocyanates III, add one mole of hydrogen halide to afford the corresponding carbamic acid chlorides (IV), methyl isothiocyanate (V) adds hydrogen bromide to form a mixture of two isomers, to which 1-bromothioformidic acid structures VI and VII have been assigned ( ). 

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