It forms a well-crystallized hydrazone with phenylhydrazine; and a-nitroso propionic acid with hydroxylamine.
Lactic acid and alanine were shown to be oxyand amino-propionic acids respectively; glycollic acid and glycocoll, oxyand amino-acetic acids; salicylic and benzamic acids, oxyand amino-benzoic acids.
CH(NH 2) ï¿½ Cooh, isoleucin, probably 0-aminocaproic acid, serin or a-amino-(-hydroxy propionic acid, aspartic acid or aminosuccinic acid, HOOCï¿½CH 2 ï¿½CH(NH 2)ï¿½Cooh, glutaminic acid or a-amino-n-glutaric acid,HOOCï¿½ (CH 2) ï¿½ CH(NH 2) ï¿½ Cooh, diaminoacetic acid, a-O-diaminopropionic acid, lysin.
CH(NH 2) ï¿½ Cooh, arginin or guanidine-a-amino-n-valerianic acid, (NH)(NH2)Cï¿½NHï¿½ (CH 2) 3 ï¿½CH(NH 2)ï¿½Cooh, ornithin or aa-diamino valerianic acid, ï¿½ (CH 2) 3 ï¿½ CH(NH 2) ï¿½ Coon, -(3-imidazol propionic acid, [[Hoocï¿½ Ch(Nh 2) ï¿½Ch 2 ï¿½ C: Chï¿½N:Chï¿½Nh]], proline or a-pyrrolidin carboxylic acid, [[Hoocï¿½ Ch.
The mean values of k for other common acids were - formic, 0.0000214; acetic, o 0000180; monochloracetic, 0.0.0155; dichloracetic, 0.051; trichloracetic, 1.21; propionic, 0.0000134.
Cinnamic acid crystallizes in needles or prisms, melting at 133° C.; on reduction it gives phenyl propionic acid, C 6 H 5 CH 2 CH 2 000H.
I propionic anhydride C6H5C(N-O COC2H5 ]-?C 6 H 5 C N O%C.C2H5.
It crystallizes in prisms, which are soluble in water, melt at 16° C., and boil at 160 5° C. When fused with an alkali, it forms propionic acid; with bromine it yields aß-dibromisobutyric acid.
Diethyl ketone, (C2H5)2 CO, is a pleasant-smelling liquid boiling at 102.7° C. With concentrated nitric acid it forms dinitroethane, and it is oxidized by chromic acid to acetic and propionic acids.
It does not yield an anhydride, but when heated loses carbon dioxide and leaves a residue of propionic acid.
Of the insoluble salts we may notice the tannate, the propionic acid ester (euquinine) and carbonic acid ester (aristoquin), the salicylic acid ester.