Download e-book for kindle: Anleitung zur quantitativen Bestimmung der organischen by Hans Meyer

Download e-book for kindle: Anleitung zur quantitativen Bestimmung der organischen by Hans Meyer

By Hans Meyer

ISBN-10: 3642901042

ISBN-13: 9783642901041

ISBN-10: 3642919618

ISBN-13: 9783642919619

It is a pre-1923 historic copy that was once curated for caliber. caliber insurance was once performed on every one of those books in an try to eliminate books with imperfections brought through the digitization technique. even though we now have made most sensible efforts - the books could have occasional blunders that don't hamper the analyzing event. We think this paintings is culturally very important and feature elected to carry the e-book again into print as a part of our carrying on with dedication to the upkeep of published works around the globe. this article refers back to the Bibliobazaar version.

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Extra resources for Anleitung zur quantitativen Bestimmung der organischen Atomgruppen

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3) Knoevenagel, Ann. 29'i', 141 (1897), v~l. B. 32, 692 (1899). 4) Goldschmidt u. Meissler, B. 23, 272 (1890). 5) B. 25, 2578 Anm. (1892). r,) D. R.. P. 133760. 7) Soc. Ind. 18, 533 (1899). Hydroxylzahl. 43 Ungefahr ein Gramm feingepulvertes Natriumamid I) wird ein paarmal mit kleinen Quantitaten thiophenfreien Benzols gewaschen und dann in ein Kolbchen von 200 ccm Inhalt gebracht, dessen doppelt durchbohrter Kork einen Scheidetrichter und einen Ruckflusskuhler tragt. Letzterer ist wieder mit einem Absorptiom:lgefasse fur das Ammuniak und mit einem Aspirator verbunden.

2) Z. anal. 34, 466, Anm. (1895). 3) M. 13, 53 (1892). - M. 14, 214 (1893). - M. 10, 319 (1894). 4) Arch. 229, 149 (1891). Benzoylierungsmethoden. 25 Benzoylehlorid, Benzoesaure-Anhydrid, N atriumbenzoat, 0-Brombenzoylehlorid, p-Brombenzoylchlorid, p-Brombenzoesaure-Anhydrid, m- und p-Nitrobenzoylehlorid, ferner noch Benzolsulfochlori d. a) Benzoylieren mittelst Benzoylehlorid. Zur "saueren Benzoylierung" mit Benzoylchlorid erhitzt man mehrere Stunden am Riickflusskiihler auf 180 0 • 1m E ins c h mel z r 0 h r e empfiehlt es sich nur dann zu arbeiten, wenn man sicher sein kann, dass die entstehende Salzsaure zu keinerlei sekundaren Reaktionen Veranlassung geben kann, oder wenn sie, bei stickstoffhaltigen Verbindungen, unter Chlorhydratbildung unwirksam gemacht wird 1).

28 Hydroxylgruppe. Fe i s t ') konnte nur auf diese Art Benzoylierung des Diacetylacetons erreichen. - Ein Gemenge von einem Molekiil Diacetylaceton, 2 Molekiilen Benzoylchlorid und 2 Molekiilen bei 200 0 getrockneten Natriumathylats 2) wurde 6 Stunden am Riickflusskiibler erhitzt, nach dem Erkaltan die Losnng vom gebildeten Kocbsalze abgesaugt und von Benzol befreit. Zur Reinigung wurda die iitherische Losung mit verdiinnter Sodalosung geschiittalt. Benzoylieren in Pyridinlosung 3). TertHire Basen wie Pyridin, Pikolin oder Chinolin wirken als Ubertrager der Benzoylgruppe, indem dieselben erst Benzoylchlorid addieren und dann das Bellzoylradikal unter Ubergang in ein Chlorhydrat wieder abspalten: /~ I~) N + R-OH- /~ I I ~/ N /"'- H Cl Es ist notwendig, zu den Versuchen reine Basen (Pyridin aus dem Zinksalze, von Er k n er) zu verwenden.

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Anleitung zur quantitativen Bestimmung der organischen Atomgruppen by Hans Meyer


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