DALE and SCHORLEMMER, in their recent investigation on the action of aqueous and alcoholic ammonia upon aurin, discovered the remarkable fact that it is extremely difficult to separate the aurin from the nmido-bases formed, by means of dilute acids. Hence they were led to conclude that the aurin combined with the amido-
D y s on , Salicylaldehyd u. Bernsteinsaure. 215 Phenylbutylendihromid, CI0Hl2Br4. -In den abgekuhlten Kohlenwasserstoff wurde tropfenweise 1 Mol. Brom eingetragen, das unter Zischen und ohne Bromwasserstoff-Entwicklung aufgenommen wurde und sich sofort entfarbte. Das so erhaltene Dibromid bildete ein schwach gelblich gefarbtes Oel, welches auf -20° abgekiihlt nicht erstarrte. Das Phenylbutylen ist dem aus der a-Lactonsaure entstehenden sehr ahnlich, unterscheidet sich von ihm aber durch seinen um 4O hoher liegenden Siedepunkt. Es ist wahrscheinlich nach der Formelc,H,-cH=c<:~ constituirt und identisch mit dem von P e r k i n * ) aus Benzaldehyd und Jsobuttersaure und von F i t t i g und J a y n e **) aus der Phenyloxypivalinsaure erhaltenen Kohlenwasserstoff, dessen Siedepunkt von P e r k i n allerdings ein wenig hoher angegeben ist. 12) Salicylaldehyd und Bernsteinsaure ; von G i b s o n D y s o n . Dicumarin, Das Gemisch von gleichen Mol. Salicylaldehyd, bernsteinsaurem Natrium und Essigsaure-Anhydrid wurde anfanglich nur im Wasserbade, aber spiiter als sich zeigte, dal's ohne Aenderung der Reactionsproducte die Ausbeute wesentlich vergrol'sert wurdein zugeschmolzenen Rohren etwa 40 *) Journ. chem. sac. 1877, a, 660.
THE phenomenon of photocliemical induction was first observed by Draper in 1843, and was more closely studied by Bunsen and Roscoe in 1857, bypringsheim in 1887, and quite recently by Mellor and others, a mixture of hydrogen and chlorine being employed by all these chemists.It was therefore thought that the study of the action of light on a mixture of carbon monoxide and chlorine might also be of interest, particularly in view of the fact that the reaction in t,his case appears to be of n somewhat different, chemical type from t h a t which occurs between liydrogeu arid chloiaiiie. In this case, the progress of the chemical change can, in tho absence of any absorbing liquid, be measured by the contraction produced, and, moreover, i t is not easy t o devise any series of probable equations like those suggested by Pringsheim which shall express the combination of these t w o gases by the aid of an intermediate product formed during the induction
IN order to see if Perkin's reaction is equally applicable to the hydroxyaldehydes, I undertook, at the request of Professor Fittig, to study the action of salicylic aldehyde on sodium succinate. J a p e (Annalerz., 216, 97) has shown that by acting on sodium
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