US2779766 Патенты
Groups R2 and R3, of which at least one is cyano, include the cyano group, -CN, carbalkoxy groups, -COO alkyl, particularly where alkyl is the lower alkyls of 1. PYRROLES HAVING AMENO, CYANO, AND MER. to 4 carbon atoms, the carbamyl group, -CONH2, and CAPTO OR SUBSTITUTED MERCAPTG GROUPS is the alkoxycarbimido groups and their hydrochloride salt AND THER PRESPARATION 2,779,766 Willian J. Middleton, Caymont, Dei, assignor to E. I. di. Pont de Nemours and Company, Wils is gon, Dei, a corporatio of Delaware No Drawing. Application April 20, 1955, Serial No. 502,714 20 Claims. (C. 260-313) groups,
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