(formamide excepted) which are at first soluble in water, the solubility, however, decreasing as the carbon content of the molecule increases.
It behaves as a powerful reducing agent, and on hydrolysis with dilute mineral acids is decomposed into formaldehyde and hydroxylamine, together with some formic acid and ammonia, the amount of each product formed varying with temperature, time of reaction, amount of water present, &c. This latter reaction is probably due to some of the oxime existing in the form of the isomeric formamide HCO NH 2.
Busch, Ber., 1899, 32, p. 2960): N C(SH):N C 6 H 5 /N C:NC6H5 C. 2 S 7Hs " H s d-H N NH C,H 7 C7 "N N C,H7 C. Harries (Ber., 1895, 28, p. 1223) has also shown that as-phenylhydrazino-acetic esters, when heated with formamide and substituted formamides under pressure, yield dihydrotriazines: CO 2 R CO-NR'-CH H2 N(C6H5)NH2 +R'NH CHO --> CH 2 N(C 6 H 5) IV The phen-a-triazines are yellow-coloured crystalline compounds of a somewhat basic character.
The silver and mercury salts, when heated, yield the metal, with liberation of carbon dioxide and formation of free formic acid; and the ammonium salt, when distilled, gives some formamide, Hconh 2.
Formamide, Hconh 2, is obtained by heating ethyl formate with ammonia; by heating ammonium formate with urea to 140° C., 2HCO.
It dissolves mercuric oxide, with the formation of mercuric formamide, (Hconh)2Hg.