1932
DOI: 10.1002/cber.19320650833
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Beiträge zur Kenntnis der höhersiedenden Fraktionen des Steinkohlenteer‐Schweröls

Abstract: Kruber: Beitrme zur Kenntnis der hohersiedenden r Jahrg. 65 271. 0. Kr ub er : Beitrlge zur Kenntnis der hiihersiedenden Fraktionen des Steinkohlenteer-Schwertils. wissenschaftl. Laboratorium d. Gesellsch. fur Teerverwertung m. b. H., Duisburg-Meiderich.j (Eingegangen a m I . August 1932.) IV. ' /\ CH, CH, CH, Die Trennung dieser Kohlenwasserstoffe gelang durch Sulfurierung und nachfolgende Ausnutzung der Unterschiede der Spalttemperaturen der einzelnen Sulfonsauren, welche teilweise vorher iiber ihre schon kr… Show more

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Cited by 38 publications
(5 citation statements)
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“…organic phase was 0.45 mole fraction CD3CN. In runs [10][11][12][13][14] the mole fraction of CD3CN in CDC13 was varied incrementally from 0.35 to 0.58. Gravimetric experiments were conducted to determine the distribution constants (Xd) for racemic CeHsCEUCOaH)-NH3CIO4 between the aqueous and organic phases whose compositions simulated those of runs 10-14 of Table I.…”
Section: Resultsmentioning
confidence: 99%
“…organic phase was 0.45 mole fraction CD3CN. In runs [10][11][12][13][14] the mole fraction of CD3CN in CDC13 was varied incrementally from 0.35 to 0.58. Gravimetric experiments were conducted to determine the distribution constants (Xd) for racemic CeHsCEUCOaH)-NH3CIO4 between the aqueous and organic phases whose compositions simulated those of runs 10-14 of Table I.…”
Section: Resultsmentioning
confidence: 99%
“…Nitration of 5,13-di- tert -butyl-8,16-dimethoxy[2.2]MCP ( 1 ) with various nitrating agents led to an intramolecular condensation reaction at the intraannular 8,16-positions to give 5,13-di- tert -butyl-8,16-epoxy[2.2]MCP ( 4 ) in 5−12% yield along with ipso -nitration products 2 and 3 . The present novel intramolecular condensation reaction of two methoxy groups might be similar to the protic-acid catalyzed condensation of 2,2‘-dihydroxybiphenyls to afford dibenzofurans at high temperatures (above 200 °C) . Thus, attempted condensation of 1 to afford 4 in the presence of protic acids, such as sulfuric acid, trifluoroacetic acid, trifluoromethanesulfonic acid, and Lewis acids, such as titanium tetrachloride and aluminum chloride−nitromethane, under various conditions failed.…”
Section: Resultsmentioning
confidence: 86%
“…In the case of toluene reflux, it takes more than 36 h to complete the reaction, but under o-xylene reflux only 12 h are required. Products (2) were simply isolated by filtration of the hot reaction mixture and evaporation of the solvent. The reactions are very clean, with water the only byproduct formed during the reaction.…”
Section: Resultsmentioning
confidence: 99%
“…Condensation of /3-alkyl-substituted aldehydes (Table I, entries 7, 8, and 10) gave essentially nonselective mixtures of diastereomers. On the other hand, reaction of 1 with the carbohydrate-derived aldehyde 3 (prepared from 2 by the method of Nicolaou)9 gave sulfone 5 as a 7.6:1 (2) Hutchinson, D. K.; Fuchs, P. L. J. Am.…”
mentioning
confidence: 99%