Carboxamides and carboximides

NBS is relatively stable, but it should be noted that A-halogenated carboxamides and carboximides such as l,3-dichloro-5,5-dimethylhydantoin, A-chlorosuccinimide, and also NBS are thermally labile and may decompose explosively.353... 

The dc polarography of a large group of pteridines in pH 2.0 phosphate buffer has been reported [85]. Three groups of pteridines (2,4,7-triamino-pteridines, 7-substituted-4-amino-2-aryl-5-pteridine carboxamides, and 4,7-diamino-2-aryl-5-pteridine carboximides) demonstrated polarographic reduction that was found to occur in two steps, to be pH-dependent, and to involve two electrons per step. 

Several strategies have been used to control the conformation about the carbonyl-nitrogen bond of carboxamide radicals, and several of these approaches shown in carboxamides or carboximides have all proved to be useful auxiliaries for controlling the configuration of new stereogenic centers formed from prostereogenic radicals. 

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