3-diketones with the amidines (A.
By using urea, guanidine, thiourea and related compounds instead of amidines, one obtains the uracils.
The dihydro derivatives are most probably those compounds which are formed in the condensation of acidyl derivatives of acetone, with urea, guanidine, &c. Tetrahydropyrimidines are obtained by the action of amidines on trimethylene bromide: Br(CH 2) 3 Br+C 6 H 5 C (:NH) NH 2 = 2HBr+C 4 H 7 N 2 (C 6 H 5) .
By replacing the chlorine in the imido-chloride by an oxyalkyl group we obtain the imido-ethers, R C(OR') :NH; and by an amino group, the amidines, R C(NH 2): NH.
Reissert, Ber., 18 99, 3 2, p. 782), the chief product in this latter reaction being an isoindazolone: // CH2 NHC6H5 /CH2 NH C6H5 /CH2 NC6H5 C6H4 - C6H4 - C6 H4 NH 2 HCI N :NCI N=N The best drawn series of the triazines is the symmetrical or cyanidine series, members of which result from the condensation of acid anhydrides with aromatic amidines (A.
They behave in most respects as unsaturated compounds; they combine with hydrogen to form amines; with water to form acidamides; with sulphuretted hydrogen to form thio-amides; with alcohols, in the presence of acids, to form imido-ethers R C(:NH) OR'; with ammonia and primary amines to form amidines R C(:NH) NH 2 i and with hydroxylamine to form amidoximes, R C(:NOH) NH 2.
AMIDINES, in organic chemistry, the nan e given to compounds of general formula R.
Pechmann (Ber., 1895, 28, p. 2 3 62) has shown that amidines of the type Rï¿½C: (NY)ï¿½NHZ sometimes react as if they possessed the constitution R.