Chemical News and Journal of Industrial Science . obtained the compoundby the action of sodium hydroxide on 4-methoxybenzene-2-indoleindigo (formed by the condensation of isatin chloridev/ith resorcinol methyl ether). Friedliinders substancemelted at 41, and was identified with the compound fromChlorocodon roots by means of the oxime and phenyl-hydrazone described in the earlier paper {loc. cit.). When an alcoholic solution of the aldehyde (i mol.) iswarmed with aniline (i mol.), condensation readily takesplace, with formation of p-metho.\ysalicylide>(OH)-CH:XPh, which sep
Chemical News and Journal of Industrial Science . obtained the compoundby the action of sodium hydroxide on 4-methoxybenzene-2-indoleindigo (formed by the condensation of isatin chloridev/ith resorcinol methyl ether). Friedliinders substancemelted at 41, and was identified with the compound fromChlorocodon roots by means of the oxime and phenyl-hydrazone described in the earlier paper {loc. cit.). When an alcoholic solution of the aldehyde (i mol.) iswarmed with aniline (i mol.), condensation readily takesplace, with formation of p-metho.\ysalicylide>(OH)-CH:XPh, which separates in long narrowlustrous yellow plates, and, after re-crystallisation fromalcohol, melts at 67—68) : — 0-4410 gave 23-5 cc. N2 (moist) at i25 and 750 =6-22. Ci4H[302N requires N=6-i7 per cent. 244. A Simple Apparatus Jor Sublimation in aVacuum. By Harold Christopher. In the course of some recent researches on thioxanthonesit was desired to purify these substances by sublimation ina vacuum. It was found, however, that, owing to the. great density of the vapours, diffusion to the cold part ofthe sublimation tube was an exceedingly slow process. Toovercome this difficulty the idea was conceived of drawinga current of air over the substance, and for this purposethe apparatus illustrated by the accompanying figure wasdesigned. Essentially it consists of a glass tube a b c p. 252 Dehydration of Crystals. Chemical News,Nov. 24, igii of which the region a b contains the substance to be sub-limed, and is heated in an oil- or metal-bath, whilst thelimb c, into which the vapours of the substance are carriedby a current of air, serves as the cooling chamber. Inorder to prevent the sublimate which collects in the regionde from falling back on the unsublimed substance, the tubeis constricted and bent, as shown at fh m, and to avoidcondensation and consequent blocking at this part, theapparatus is immersed in the bath up to the level l. Thecurrent ot air, which is regulated by m
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