PYRUVIC ACID, Or [[Pyroracemic Acid, Ch 3 Co Co 2 H]], an organic acid first obtained by J.
Pyruvic nitrile, or acetyl cyanide, CH 3 CO.
Pyruvic Acid >>
CH2([[Coon)2+Ch3cho-->Ch3 Ch:C(000h)2->Ch3 Ch:Ch 000h]]; or by heating pyruvic acid with an excess of acetic anhydride and sodium acetate to 160-180° C. (B.
It may be synthetically obtained by distilling oxindole (C 8 H 8 NO) with zinc dust; by heating orthonitrocinnamic acid with potash and iron filings; by the reduction of indigo blue; by the action of sodium ethylate on orthoaminochlorstyrene; by boiling aniline with dichloracetaldehyde; by the dry distillation of ortho-tolyloxamic acid; by heating aniline with dichioracetal; by distilling a mixture of calcium formate and calcium anilidoacetate; and by heating pyruvic acid phenyl hydrazone with anhydrous zinc chloride.
CH (CH 3) C02H, is formed by the dry distillation of tartaric acid; by heating pyruvic acid with concentrated hydrochloric acid to 180° C.; by the reduction of citraconic and mesaconic acids with sodium amalgam; and by the hydrolysis of /-cyanbutyric acid.
Wurtz); by boiling a-chlorpropionic acid with caustic alkalis, or with silver oxide and water; by the reduction of pyruvic acid with sodium amalgam; or from acetaldehyde by the cyanhydrin reaction (J.
Chromic acid oxidizes it to acetic acid and carbon dioxide; potassium permanganate oxidizes it to pyruvic acid; nitric acid to oxalic acid, and a mixture of manganese dioxide and sulphuric acid to acetaldehyde and carbon dioxide.