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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 775-779 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Me⊕ (Me = Na; K) cations in MeClO3 chlorates were complexed by crown ethers (CE): 12C4, 15C5 and 18C6 in solution. In the solid phase we could obtain only Na(15C5)ClO3 and K(18C6)ClO3 complexes significant shift in 35Cl-n.q.r. frequency with respect to the frequency of pure sodium and potassium chlorates was observed. The shifts at 77K were -2.879 MHz for Na(15C5)ClO3 and -1.004 for K (18C6)ClO3.For other reaction mixtures the 35Cl-n.q.r. frequencies observed were the same as for the appropriate pure chlorates which confirmed that the expected complexation in the solid phase had not occurred. The investigation described in this paper proved a rapid increase in selectivity of crown ethers at the transition from the solution to the solid state. Moreover, in the solid phase of Me(CE)ClO3 complexes a significant increase was found in the shielding effect of the Me⊕ cation by the surrounding crown ether.
    Additional Material: 2 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 380-388 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Reaction of 5,6-Dihydro-1,4-oxathiin-4,4-dioxides with Nucleophilic CompoundsBy reactions of 5,6-dihydro-1,4-oxathiin-4,4-dioxides (1, 5, 8) with thioles, amines and CH-acid compounds 2-substituted ethansulfonylcarbonyl compounds are formed. The structures of the reaction products are determined by elemental analysis, i.r. and 1H-n.m.r.-spectroscopy.5,6-Dihydro-1,4-oxathiin-4,4-dioxide sind gut zugänglich durch die Oxidation von 5,6-Dihydro-1,4-oxathiinen mit Wasserstoffperoxid. Besonders zur Darstellung der 5,6-Dihydro-2-methyl-3-carboxamido-1,4-oxathiin-4,4-dioxide, von denen einige im Pflanzenschutz wegen ihrer systemischen fungiziden Wirkung Bedeutung erlangten, wurden verschiedene Methoden beschrieben [1, 2]. In ähnlicher Weise lassen sich auch die entsprechenden Ester und Säuren synthetisieren.
    Additional Material: 1 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 177-183 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Reaction between Hydrazines and Aminohydroxy-hydrobenzoxazol. Synthesis of AzoolefinesBy the reaction of 1-hydroxy-2-oxocyclohexane-carboxamide (1) with cyanamide 2-amino-7a-carbamoyl-3a-hydroxy-3a,4a,5,6,7,7a-hexahydrobenzoxazole (2) is formed. Compound 2 and arylhydrazine-hydrochloride yield 1-carbamoyl-2-arylazocyclohex-1-ene (4a, b). In morpholine azocompounds 4a, b rearrange to hydrazones 5a, b. Compound 2 and hydrazine yield 4-(2-carbamoyl-cyclohexyl)-semicarbazide (10), 10 forms perhydroquinazoline-2,4-dione (11) by oxidation with iodine. 2 and cyanic acid yield the urea derivative 12. 2 and arylamine-hydrochloride afford the 2-arylamino-3a-hydroxy-7a-carbamoyl-hexahydrobenzoxazoles 13a, b. By fragmentation and “Dimroth-rearrangement” of 2 tetrahydrobenzoimidazolone, (14) is formed, 12 gives 1-carbamoyl-tetrahydrobenzoimidazolone (15). 2 and m-nitrobenzaldehyde yield “Schiff-base” 16. 2 and hydroxylamine sulphate form 2′-amino-2-hydroximino-cyclohexane-spiro-5′-oxazolin-4′-one (18) 18 and phenylhydrazine hydrochloride yield 1-phenylazo-2-ureido-carboxy-cyclohex-1-ene (19).
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  • 4
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Ring Contraction Induced by Hydrogenperoxide2-Amino-7a-carbamoyl-3a-hydroxy-3a,4,5,6,7,7a-hexahydro-benzoxazole (1) and hydrogenperoxide rearrange to 2′-amino-cyclopentanespiro-5′-oxazolin-4′-one (5). 5 and aniline hydrochloride form the phenylaminoderivative 6, 5 and 2,5-dichlorophenylhydrazine hydrochloride form the 2,5-dichlorophenylhydrazinederivative 7. 5 and hydrochloric acid afford cyclopentanespiro-5′-oxazolidin-2′,4′-dione (8). Hydrolysis of 5 or 8 furnish 1-hydroxy-cyclopentane-carboxylic acid (9).
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 129-132 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Formation of Ethoxyhydroquinazolinone by Attack of an Estercarbonyloxygen at a Cyano GroupBy the reaction of ethyl-2-oxo-cyclohexanecarboxylate with cyan amide 4-ethoxyhexahydroquinazolin-2-one (12) is formed. Butyl-2-oxo-cyclopentanecarboxylate and cyan amide yield butyl-3-cyanamino-cyclopent-1-en-carboxylate (14). 2-Oxocyclohexane-carboxamide (1) and ethyl-cyanoacetate form with sodiumhydroxide 4-cyano-octahydroisoquinolin-1, 3-dione (17) and with ammonium acetate ethyl cyclohexylidene-cyanoacetate-2-carboxamide (18). 18 and ammonia, hydrazine, or cyclohexylamine form the salts of cyanohydroquinazolindione 20a-c, respectively.
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  • 6
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 895-901 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Synthesis of Octahydroquinazolinones and their Reaction with PeracidBy reaction of cyclohexanone-2-carboxamide with ammonia and aldehydes, octahydroquinazolinones 2a-f, and with Schiff bases octahydroquinazolinones 3a-c are formed. 2-Hydroxycyclohexanone-2-carboxamide forms with ammonia and butyraldehyde the hydroxyocta-hydroquinazolinone 4. Compound 2e reacts with monoperoxiphthalic acid to the hydroxyoxaziridine 5e which reacts with alkali hydroxide to compound 6. 8 yields with peroxy acid the hydroperoxy epoxide 9.
    Notes: Bei Umsetzung von Cyclohexanon-2-carbonsäureamid mit Ammoniak und Aldehyden werden die Octahydrochinazolinone 2a-f, mit Schiffschen Basen die Octahydrochinazolinone 3a-c gebildet. 2-Hydroxycyclohexanoncarbonsäureamid bildet mit Ammoniak und Butyraldehyd das Hydroxyoctahydrochinazolinon 4. Verbindung 2e reagiert mit Monoperoxyphthalsäure zum Hydroxyoxaziridin 5e, das durch Natronlauge zu Verbindung 6 umgelagert wird. Aus 8 wird mit Persäure das Hydroperoxyoxaziridin 9 erhalten.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 568-572 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electrochemical Rearrangement of Papaverine and Dimerisation to 12,12′-Bis{2,3,9,10-tetramethoxy-indolo [2,1-a]isoquinolinyl}Preparative anodic oxydation of papaverine [6,7-dimethoxy-1-(3,4-dimethoxybenzyl)isoquinoline] in methanol with the aid of Pt-electrodes yields 12,12′-bis{2,3,9,10-tetramethoxyindolo[2,1-a]isoquinolinyl}.During this process 3 H-atoms are lost per mole papaverine. At first the benzyl-isoquinolinestructure rearranges to 2,3,9,10-tetramethoxy-indolo [2,1-a]isoquinoline, which dimerises by C—C-bonding in position 12. Voltammetric measurements were carried out. 13C-n.m r.-spectroscopic results demonstrate steric hindrance of the two molecule-moieties.
    Notes: Die präparative anodische Oxydation von Papaverin [6,7-Dimethoxy-1-(3,4-dimethoxy-benzyl)isochinolin] in Methanol an Platinanoden führt unter Verlust von 3 Wasserstoffatomen pro Mol zu 12,12′-Bis{2,3,9,10-tetramethoxy-indolo[2,1-a]isochinolinyl}. Hierbei lagert sich die Benzyl-isochinolinstruktur unter Abgabe von 2 H-Atomen zu 2,3,9,10-Tetramethoxy-indolo[2,1-a]isochinolin um, das durch weiteren Verlust je eines Protons und Elektrons am C-Atom 12 dimerisiert. Es wird über voltammetrische Ergebnisse berichtet. 13C-NMR-spektroskopische Messungen weisen auf eine beträchtliche Verdrillung beider Molekülhälften hin.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 537-539 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Synthesis of Fused Hydroquinazolinones
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  • 10
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the reaction of 1,1-dichloro-2,2-bis-(4-nitrophenyl)ethane (1) with 1,5-diazabicyclo-[4.3.0]non-5-ene(DBN) in acetonitrile (MeCN), dichloromethane (DCM), tetrahydrofuran (THF), isopropylether (IPE) and hexane (Hex) solvents are reported. The reaction is a simple β-elimination forming 1-chloro-2,2-bis-(4-nitrophenyl)ethane (2) (100% conversion). The rate constants are similar for MeCN, THF, IPE, but lower by a factor of 2 and 7 for DCM and Hex respectively. The deuterium kinetic isotope effects kH/kD are between 10 and 6 for MeCN and Hex solvents. The entropies of activation (ΔS≠) are negative and large and show no correlation with the polarity of the solvents. The free enthalpies of activation (ΔG≠) are rather small (about 68 kJ mol-1). The results are interpreted in terms of E2H with a contribution of (E1cB)I mechanism.
    Additional Material: 2 Tab.
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