It has been shown by Davis and Rosenquist'that N-nitroso-N'-alkylguanidines react with alkylamines to eliminate the nitrosamino group and form NR, N'-R-dialkylguanidines. This reaction cannot be applied to the preparation of N-alkyl-N'-nitroguanidines because N- nitros0-N'-nitroguanidine is unknown. We have found, however, thak N-methyl-N'- nitroguanidine, I, can be nitrosated with ease, and the N-methyl-N-nitroso-N' ...