guanidine and substituted guanidines react with 2,4-pentanedione to form n-substituted 2-amino-4,6-dimethylpyrimidines at a rate which is lower by at least a factor of 20 than the rate of reaction of 2,4-pentanedione with primary amines .
C0120446
guanidine
C0018320
guanidines