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  • 1
    ISSN: 1434-193X
    Keywords: Triplet recombination ; Electron transfer ; Radical ions ; Photochemistry ; Terpenes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The triphenypyrylium tetrafluoroborate (TPT)-sensitized reactions of several terpene donor molecules, including sabinene (1), α-phellandrene (4), α-terpinene (5) and γ-terpinene (6) give rise to significantly different products than reactions induced by other electron-transfer sensitizers, such as 1,4-dicyanobenzene (DCB). The divergent reactions require decidedly different key intermediates; the products obtained with TPT can be explained by dissociative recombination of the intermediate radical-radical cation pair in the triplet state, generating donor-derived biradicals.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Eine kurze Synthese von Tricyclo [3.3.0.03,7]octan-1,5-dicarbonsäure-dimethylester und seines 3,7-Dimethylderivats. Ein neuer Weg zum Tricyclo [3.3.0.03,7]octan-GerüstDie 5-stufige Synthese von Tricyclo[3.3.0.03,7]octan-1,5-dicarbonsäure-dimethylester (13) und seines 3,7-Dimethylderivats 14 ausgehend von den leicht zugänglichen cis-Bicyclo[3.3.0]octan-3,7-dionen 1 bzw. 2 wird beschrieben. Schlüsselreaktion ist die Oxidation der Bis-enolate der cis-Bicyclo[3.3.0]octan-3,7-dicarbonsäure-dimethylester 11 und 12 mit Iod zum Tricyclo-[3.3.0.03,7]octan-Derivat 13 bzw. 14. Zusätzlich wird die Synthese des Diesters 13 nach bekannten Methoden versucht.
    Notes: Five-step syntheses of dimethyl tricyclo[3.3.0.03,7]octane-1,5-dicarboxylate (13) and its 3,7-dimethyl derivative 14 from the readily available cis-bicyclo[3.3.0]octane-3,7-diones 1 and 2, respectively, are described. The key-step implies the iodine oxidation of the bis-enolate derived from the corresponding dimethyl cis-bicyclo-[3.3.0]octane-3,7-dicarboxylates 11 and 12, thus being developed a new synthetic entry into the tricyclo[3.3.0.03,7]octane skeleton. Also, some attempts to synthesize diester 13 by using known methodology for the synthesis of compounds containing this tricyclic skeleton are described.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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