4-Chlorophenyl Isocyanate → HCID 20555444, compound

Participants

Reaction Steps

A 50-ml flask was charged with 5.0 grams (0.035 mol) of N-methyl chloromethane sulfonyl chloride (from Example 1) and 5.3 grams (0.035 mol) of p-chlorophenylisocyanate. Then 3 ml of triethylamine were added. There was an exothermic reaction, and the mixture turned solid. After standing for 3/4 hour at 25° C., ether was added to form a slurry. This slurry was filtered to give a white solid which was reslurried in ether, filtered and dried to give 2.7 grams of 4-p-chlorophenyl-1,2,4-thiadiazolidine-1,1,3-trione having a melting point of 155°-157° C. Analysis for C9H9ClN2O3S: S, 12.3%; Cl, 13.6%. Found, S, 12.4%; Cl, 13.7%. The infrared spectra had strong absorption at 1720, 1485, 1435, 1370, 1340, 1280, 1255, and 1145 cm-1. The NMR spectra in 6D-dimethylsulfoxide had major peaks at 7.7 (4H), 5.6 (2H), and 3.3 (3H) ppm, and minor peaks at 4.0 and 2.8 ppm.

Provenance & Evidence