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Löslichkeitsisotherme und Phasendiagramm des Systems Tm2O3-SeO2-H2O bei 100°C
The selenites of thulium are used as starting substances to obtain the respective selenides which have valuable semiconductive properties. In...
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Synthese und Strukturaufklärung von Pyrimidobenzimidazolen und kondensierten Derivaten, 3. Mitt. [1,2]. Decahydropyrimido[1,2-a]benzimidazol-2-ole und Octahydropyrimido[1,2-a]benzimidazole
The reaction of racemic trans -hexahydrobenzimidazol-2-amine with three vinylogous ketones under mild conditions was studied. Only in the case of...
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Spontane Oszillationserscheinungen an Kupfer
Spontaneous potential oscillations on copper in a hydrochloric acid solution of hydrogen peroxide discussed as a new self-oscillating system....
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Die Sulfid-Braunstein-Batterie und elektrochemische Energiequellen in der
Wächtershäuser schen Hypothese zur Entstehung des LebensRecently we could show that elementary sulfur is an excellent cathode material at room temperature in zinc-sulfur batteries as it is reduced rapidly...
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Enantioselective Catalyses CXXXV [1]. Stereoselective Hydrogenation of Folic Acid and 2-Methylquinoxaline with Optically Active Rhodium(I)-Phosphane Complexes
In the hydrogenation of the C*N double bonds of the pyrazine ring of folic acid to 5,6,7,8-tetrahydrofolic acid a new asymmetric center is formed at...
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Reaktionen von Siliciummonoxid mit Münzmetallhalogeniden
Reaction of solid SiO with CuI, AgI, AgCl, or AgF results in the formation of the silicon tetrahalides Si X 4 and elemental silver or copper. The...
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Untersuchung der Phasengleichgewichtein den Systemen Cs2SeO4-CoSeO4-H2Ound Cs2SeO4-NiSeO4-H2O bei 25.0°C
Phase equilibria in the systems Cs 2 SeO 4 -CoSeO 4 -H 2 O and Cs 2 SeO 4 -NiSeO 4 -H 2 O at 25.0°C were studied. Two congruently soluble double salts (Cs 2 Co(SeO 4 ) 2 ċ6H...
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Niedertemperatur-Zink-Schwefel-Batterie
High-temperature sulfur batteries, for example the sodium-sulfur battery, are well known. However, the positive electrode based on elementary sulfur...
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Systematische Untersuchungen zur biologischen Abbaubarkeit von Verpackungsmaterial, 2. Mitt. Zur biologischen Abbaubarkeit von auf Polyvinylalkohol basierenden Verpackungsfolien
Earlier investigations have shown that polymers with a high density of functional groups along and/or in the molecular chain are more prone to good...
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Synthese und Geruchseigenschaften von Apo- und Homocampholenverbindungen
New substances of the brahmanol ® type with special substitution at the five-membered ring are included in the study of the relationship between...
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Synthese des (±)-Rosmarinsäuremethylesters
Regioselective cleavage of the glycidic ester 3 by BF 3 /ether to pyruvic acid ester 4 followed by NaBH 4 reduction affords the lactic acid derivative 5a ...
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Untersuchungen über Chinone, 10. Mitt. Zur Reaktion vonp-Benzochinon mit sekundären aliphatischen Aminen
p -Benzoquinone ( 1 ) reacts with dialkylamines 2a-d to 2-dialkylamino- p -benzoquinones 3 , 2,5- bis -dialkylamino- p -benzoquinones 4 ,...
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Kristallstruktur von N,N,N′,N′-Tetraisopropyl-p-phenylen-diammonium-dichlorid und-bis(tetrachloroaluminat)
Protonation of the sterically overcrowded N,N,N′,N′-tetraisopropyl- p -phenylenediamine leads to a significant shortening of the C-N bond lengths of 7...
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Enantiomere und diastereomere 2-Methoxymethyl-pyrrolidin-1-dithiocarbonsäureester
Formation of the 2-methoxymethyl-pyrrolidine-1-dithiocarboxylates 2–4 and alkylation of 2 and 3 were studied. Enantiomeric and diastereomeric...
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N/S- und As/S-verbrückte [3]- und [5]-Ferrocenophane
New heterocyclic ferrocenophanes have been isolated. 1,1′-Dilithioferrocene reacts with the electron rich heterocycles S 4 N 4 and As 4 S 4 to give 1,...
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(Z)-homo-β-Santalol: Synthese und Geruch
The synthesis of the title compound is described. Starting with the α-alkylation of homo -norcamphor followed by a Wittig reaction, a Tebbe ...