共查询到20条相似文献,搜索用时 15 毫秒
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Zusammenfassung Es wird die Gewinnung von Methylendioxybenzol durch Decarbonylierung von Piperonal beschrieben.9. Mitt. über Derivate des Methylendioxybenzols. 相似文献
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Ohne Zusammenfassung 相似文献
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Notice on Oxocobaltates of Sodium NaCoO2 belongs to the α-NaFeO2 type of structure with a = 2.888, c = 15.606 Å; NaCo2O4 is isostructural with KCo2O4: a = 2.843, c = 10.811 Å. In a range of 73-297 K NaCoO2 and AgCoO2 show practically temperature independent paramagnetism: at 297 K μeff/μB = 0.7 and 0.6, respectively. 相似文献
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Ohne Zusammenfassung 相似文献
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Summary Hydroxylammonium fluoride was prepared in aqueous solution by the reaction of hydroxylamine with aqueous hydrogen fluoride. The solubility in water (148.7 g/100 g) and ethanol (0.146 g/100 g), the density (1.621±0.005 g/cm3) and the metling point (97.8±2 °C) of the compound have been determined. [NH3OH]F crystallizes orthorombic, Pabc,a=6.490(1) Å,b=9.799(1) Å,c=13.519(2) Å. 相似文献
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Alfred Courtin 《Helvetica chimica acta》1981,64(6):1849-1853
Syntheses of Some Alkyl, Cycloalkyl and Aryl 3-Aminophenyl Sulfones Syntheses of alkyl ( 1a – 1i, 1m ), cycloalkyl ( 1j, 1k ) and aryl ( 1l ) 3-aminophenyl sulfones were achieved by ethanolic Béchamp-reduction of the appropriate 3-nitrophenyl sulfones ( 3a – 3m ). The alkyl ( 3a – 3i ) and cycloalkyl ( 3j, 3k ) 3-nitrophenyl sulfones were prepared via nitration of their respective sulfones ( 2a – 2k ). Methyl (3-nitrophenyl) sulfone ( 3a ) was also prepared by condensation of 3-nitrobenzenesulfinic acid ( 4 ) with bromoacetic acid to 3-nitrophenylsulfonyl-acetic acid ( 5 ) followed by decarboxylation. 相似文献
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H. Hartkamp 《Fresenius' Journal of Analytical Chemistry》1959,169(5):339-342
Zusammenfassung Die photometrische Bestimmung des Vanadiums mit Wasserstoffperoxyd wird weitgehend unabhängig von den in der Probenlösung vorliegenden Gehalten an Wasserstoffperoxyd und Schwefelsäure, wenn man die photometrische Messung bei der Wellenlänge des isosbestischen Punktes, =405 m, vornimmt.Ich danke Fräulein Annette Schenkedehl für die experimentelle Mitarbeit. 相似文献
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Theodor Dieckmann 《Fresenius' Journal of Analytical Chemistry》1921,60(7-8):230-234
Ohne Zusammenfassung 相似文献
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M. Kleinstück 《Fresenius' Journal of Analytical Chemistry》1911,50(11):697
Ohne Zusammenfassung(Mitteilung aus dem Chemischen Institut der kgl. Forstakademie Tharandt.) 相似文献
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Some 1-substituted 2, 3-dimethyl-quinoxalinium-perchlorates were synthesized by reaction of butane-2, 3-dion with N-monosubstituted 1,2-diamino-benzenes in strongly acidic solution. 2, 3-dimethyl-4-cyclohexyl-pyrido[2,3-b]pyraziniumperchlorate was obtained from an analogous reaction. 相似文献
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Julius Löwe 《Analytical and bioanalytical chemistry》1881,20(1):223-225
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Dr. M. Kleinstück 《Analytical and bioanalytical chemistry》1911,50(11):697-697
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Julius Löwe 《Fresenius' Journal of Analytical Chemistry》1881,20(1):223-225
Ohne ZusammenfassungFrankfurt a. M., November 1880. 相似文献
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Dr. Joachim Schantl 《Monatshefte für Chemie / Chemical Monthly》1977,108(3):599-602
The reaction product of the intermediate -phenylazostyrene2 with phenylglyoxal bisphenylhydrazone4 in the course of the reaction of -chloro- or -bromoacetophenone1 with phenylhydrazine has been reinvestigated. Its structure is shown by spectroscopic methods to be that of the 1,4-addition product6 rather than the cycloaddition product5 as reported.
Mitt.: Additionsprodukte von Hydrazinderivaten an Azo-olefine (1. Mitt.1). 相似文献
Mitt.: Additionsprodukte von Hydrazinderivaten an Azo-olefine (1. Mitt.1). 相似文献
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Frank Kienzle 《Helvetica chimica acta》1979,62(1):155-155
Note on the synthesis of rac. cis- and trans-nor-abscisic acid The synthesis of the 2-nor-analogues of cis- and trans-abscicic acid is described. 相似文献
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Alfred Courtin 《Helvetica chimica acta》1983,66(4):1046-1052
Syntheses of Some Alkyl-, Cycloalkyl- and Aryl-(4-aminophenyl)-sulfones Syntheses of (4-aminophenyl)-alkyl, -cycloalkyl and -aryl sulfones 2 were achieved both by alkylation of 4-(acetylamino)-benzenesulfinic acid ( 7 ) to the corresponding acetanilides 9 followed by hydrolysis and by oxidation of the appropriate (4-nitrophenyl)-sulfides 11 to (4-nitrophenyl)-sulfones 1 with subsequent Béchamp reduction. 相似文献