Deutsches Baugewerks-Blatt : Wochenschr. für d. Interessen d. prakt. Baugewerks: Deutsches Baugewerks-Blatt : Wochenschr. für d. Interessen d. prakt. Baugewerks

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Persistenter Identifier:: 1529487027376

Titel:: Deutsches Baugewerks-Blatt : Wochenschr. für d. Interessen d. prakt. Baugewerks

Erscheinungsort:: Berlin

Erscheinungsverlauf:: 42.1882-58.1899

Strukturtyp:: Zeitschrift

Sammlung:: Zeitschriften

Lizenz:: https://creativecommons.org/publicdomain/mark/1.0/deed.de

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Persistenter Identifier:: 1529487027376_1884

Titel:: Deutsches Baugewerks-Blatt : Wochenschr. für d. Interessen d. prakt. Baugewerks

Jahrgang/Band:: Jg. 44, Bd. 3, 1884

Erscheinungsjahr:: 1884

Sprache:: deutsch

Strukturtyp:: Band

Standort:: Universitätsbibliothek Stuttgart

Signatur:: XIX/135.2-3,1884

Lizenz:: https://creativecommons.org/publicdomain/mark/1.0/deed.de

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Ausgabe

Titel:: 44. Jahrgang. No. 21.

Strukturtyp:: Ausgabe

Artikel

Titel:: Konkurrenzwesen.

Strukturtyp:: Artikel

ee 178.) Chenvical Notices trom Foreign Sources. sv a.m mee = A ——————— TO 3 - A ptt ree a ry products belonging to the fatty series, ethylen, propylen, forms snow-white crystals, which melt at 152°, If heated amylen, ordinary aceton, methyl-ethyl-keton, and diethyl- to 120° along with concentrated hydrochloric acid under keton, but also hydrocarbons of the aromatic series, such pressure it is resolved into carbonic acid; sulphuretted as toluol, dimethyl-benzol, methyl-ethyl-benzol, and hydrogen, acetonic acid. and sal-ammoniac. yoga of the camphoric groups, such as tereben pry yi. of the Xylol-sulphamids.—Ira Remsen. and ditereben. A hypothetical paper. ection of the Chemica m i ile g beware . . 2 Ce ror bdonsalin ro show Aitro-derivatives of the Hydroguinona.—R. Nietak, That a relation exists between the component parts of one The author, on treating an acetylised hydroquinon with ind the same oil. We may in general assume that the nitric acid, ahiEing a AIP ATNIey which crystallises aydrocarbon is the original chemical individual from which po alcohol a - Sy ur-yellow nese melting at alcohols, aldehyds, acids, &c., are derived by processes of oh hy . Mh 1c oo = Tach hi 20 id Alte aussie hydratation, oxidation, or reduction, perhaps during the 2 Eo yie! s a Sp Ny a o x! iquid, turning to a life of the plant. The author gives the results of his joiden-yellow on the addition of acids. researches on the oils of valeriah and of tansey. Synthesis of the Aromatic Sulphones from the On Pyroxanthin.—H. B. Hill.—Pyroxanthin, after re- Chlor-anhydrides of Sulphonic Acids and _Hydro- crystallisation from alcohol, forms oy shining, orange- carbons by the Action of Aluminium Chloride.—H. yellow needles, with a bluish refle@tion. From a solution Beckurts and R. Otto (Preliminary notice).—The authors in boiling benzol it is obtained in large reddish yellow ind that the process of MM. Friedel and Crafts is well monoclinar prisms, Its composition may be represented adapted to effect the synthesis of sulphones. sy the formula CisHyzO3. If boiled with zinc-powder On Aurin.—E. and O. Fischer.—Leucanilin prepared and glacial acetic acid diluted with a little alcohol it fom pure aurin, on the decomposition of its diazo-com- forms a colourless solution, from which water precipitates pound by the addition of alcohol, yielded a crude hydro- a white voluminous substance, probably hydro-pyroxanthin. :arbon, from which the authors have succeeded in ob- On Borneo Camphor.—J. Kachler.—The author is raining pure triphenyl-methan. sngaged with a Sonpmanyy examination of the natural On Invertin _ M. Barth.—The author has isolated Borneo camphor of Dryobalanops Camphora, and of the : : hi - borneol obtained by ers be ne rom the camphor and analysed this ferment, which he finds composed of of the Laurinez. He finds that both borneols yield with phosphorus pentachloride or with strong hydrochloric acid identical chlorides, C1oHy,Cl, which melt at 147° to 148°. This chloride is readily decomposed if heated in tubes to 100° along with water, yielding hydrochloric acid and a solid camphin, CroHyg, which melts at 51° to 52°, and boils about 160° ~ A New Indicator in Alkalimetry.—W. v. Miller.— The indicator proposed is tropeolin, 2 new colouring-matter jiscovered by O. Witt, and manufactured by Messrs. Williams, Thomas and Dower. The shade known as oo is characterised by its behaviour with concentrated sulphuric acid, which turns its aqueous solution from a yellow to a crimson red. According to the author this reaction is sommon to all the mineral acids, even dilute, and to tertain organic acids, especially the oxalic. Hence this variety of tropeolin is a valuable indicator in alkalimetrical titration, as has been proved by a series of comparative periments with this colour and with litmus. The alkaline liquid to be titrated is mixed with an aqueous solution of tropeolin containing 005 per cent of the colour, so that 2 c.c. of tropeolin solution are added to 50 c.c. of the liquid to be analysed, and the acid is dropped in till the light yellow colour of the solution changes suddenly 0 a yellowish red. The point cannot be overlooked, for the transformation of colour is too striking, and the addition of a further drop removes all doubt by converting the orange colour into a decided red. Tropeolin can be preserved either in the dry or the wet state, and has the iecided advantage that it is not affected either by acid car- bonates or free carbonic acid. Hence the alkaline car- bonates can be titrated without the aid of heat. If tropeolin is used as an indicator a normal solution of sodium carbonate may be used instead of one of a :austic alkali, which is difficult to preserve. Further, [inure of litmus is reddened not merely by free acids, but by neutral metallic salts, whilst the yellow solution of tropeolin is turned red only by free acids, solutions of metallic salts having no effe&. He has alsocompared its action with that of other ferments and finds that it is slower and more feeble than many sspecially emulsin, On Atmospheric Hydrogen Peroxide.—E. Scheene. (Second communication).—The author concludes that when the barometric minimum, which affected the state of the weather in Moscow, lay to the north of that city the -ain and snow contained on an average more hydrogen peroxide than when such minimum lay to the south. Sulphin Compounds of Thio-urea.—A. Bernthsen and H. Klinger.—The authors, from the result of the reaction between certain thio-urea compounds and mer- suric oxide, consider it probable that the constitution of ‘hese addition-produds resembles that of the sulphin pases. Potassium Cyanide and Dibromo-succinic Ether. ~A. Claus and Fr. Calliess.—The final produc was succinic acid. The authors did not succeed in isolating licyano-succinic acid. Potassium Cyanide and Dichloracetic Ether.—A. Claus and R. Weiss.—The results are decidedly opposed to the formation of a dicyanacetic acid. Formation of Dichloracetic Ether from Chloral,— A Claus.—An inquiry into the conditions under which zyanogen can be introduced into organic compounds. Occurrence of Allantoin and Hippuric Acid in the Urine of Dogs.—E. Salkowski.—The author finds the arine of dogs, under ‘normal circumstances, free from allantoin. Hippuric acid was observed in the urine of dogs confined entirely toa flesh-diet, though the maximum amount did not exceed 1g of the urea secreted. Action of Phosphorus Penta-sulphide upon Amides. —A. Bernthsen.—The reaction of phosphorus penta-sul- phide with amides affords a new process for the prepara. tion of thiamides. Remarks en the Previous Paper.—~A, W. Hefmana. -A personal communication. Oxidation of Xylol.sulphosamids (Third communi- cation).—W. Iles and Ira Remsen.—An examination of oxytoluylic acid and its salts. . Compound Obtained by the Interaction of Aceton, CyK, CySK, H.0, and Aqueous Hydrochloric Acid —F, Urech.—The compound in question, CsH;NOa8

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