Diazomethane, CH 2 N 2, was first obtained in 1894 by H.
Bamberger (Ber., 1895, 28, p. 1682) regards it as the anhydride of iso-diazomethane, CH 3 N: N OH, and has prepared it by a method similar to that used for the preparation of iso-diazobenzene.
Well-dried hydroxylamine hydrochloride is dissolved in methyl alcohol and mixed with sodium methylate; a solution of methyldichloramine in absolute ether is then added and an ethereal solution of diazomethane distils over.
Diazomethane is a yellow inodorous gas, very poisonous and corrosive.
Diazomethane converts it into the methyl derivatives of isocyanic acid, and nitramide, NH2N02.
C02R CH 3 CH: CBr CO 2 R+NaCH (CO 2 R) 2 --->CH 3 C. I C(C02R)2 by the action of diazomethane or diazoacetic ester on the esters of unsaturated acids, the pyrazoline carboxylic esters so formed losing nitrogen when heated and yielding acids of the cyclo- propane series (E.