Determination of radicles in carbon compounds / by Dr. H. Meyer. Authorized translation by J. Bishop Tingle.

  • Meyer, Hans (Hans Johannes Leopold), 1871-
Date:
1903
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Licence: In copyright

Credit: Determination of radicles in carbon compounds / by Dr. H. Meyer. Authorized translation by J. Bishop Tingle. Source: Wellcome Collection.

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    yields an additive compound CH.C.OH.CO.OH C8H < i i 8 4 CO NH.OH with hydroxylamine,1 and it has been subsequently shown that certain unsaturated ketones, such as pho- rone, behave in a similar manner.2 (3) PREPARATION OF SEMICARBAZONES.3 The formation of well-crystallized derivatives of semicarbazine has proved extremely useful in the inves- tigation of terpene compounds which often yield liquid oximes, and phenylhydrazonesthat only crystallize with difficulty and readily undergo decomposition. As a rule the aldehyde or ketone combines with semi- carbazine in equimolecular proportion, but ethylic aldehydophenylcarbonate yields the compound CaH»O.CO.O.C0H4.CH:N.NH.CO.N:CH.C|,H4.O.CO.OCaH64 Aliphatic ketones have varying velocities of interac- tion with different salts of semicarbazine, hence.by the successive addition of different semicarbazine salts to a mixture of such ketones, a Separation of them may be effected (cf. p. 72).5 Preparation of Semicarbazine Salts.6 (A) Semicarbazine Hydrochloride. NH2.C0.NH.NH2.HC1 1 Bishop Tingle, Am. Chem. Journ. 19, 408. 2 C. Harries and F. Lehmann, ß. 30, 231, 2726. 3 Baeyer and Thiele, Ibid. 17, 1918. 4 H. Cajar, lbid. 31 (1899). 2806. 5 A. Michael, J. pr. 60 [2] (1899), 347. 6 T. Curtius and K. Heidenrich, Ibid. 52 [2] (1895), 465.