A number of aminoguanidines have been prepared by the reaction of substituted hydrazines with cyanamide or S-methylisothiourea. These compounds in addition to some N-aminotriazoles and other related N-amino compounds have been converted to 5nitrofurfurylidene derivatives. The reactions of 5-nitro-2-furaldehyde thiosemicarbazone with chloroacetic acid and 8-propiolactone are described.
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