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  • Organic Chemistry  (2)
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Asymmetric hydrosilylation of prochiral ketones in the presence of N-benzyl-N-methylephedrinium halometallates (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 1 (1987), S. 435-439 
    Details
    ISSN: 0268-2605
    Keywords: Asymmetric hydrosilylation ; bis(N-benzyl-N-methylephedrinium) hexachloroplatinate(IV) ; N-benzyl-N-methylephedrinium bromotrichlororhodate(III) ; ( - )-bis(N-benzyl-N-methylephedrinium) dibromodichlorozincate(II) ; chiral synthesis, enantioselectivity ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-benzyl-N-methylephedrinium hexachloroplatinate(IV), bromotrichlororhodate(III), and dibromodichlorozincate(II) have been synthesized by reacting ( - )-N-benzyl-N-methylephedrinium bromide with K2PtCl6, RhCl3 · 4H2O and ZnCl2, respectively. The above halometallates have been found to catalyse the asymmetric hydrosilylation of acetophenone and 3-acetylpyridine with diphenylsilane. The hydrosilylation of 3-acetylpyridine in the presence of ( - )-N-benzyl-N-methylephedrinium zincate followed by silyl ether hydrolysis gives 1-(3-pyridyl)ethanol in ca 50% optical yield.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590010508
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of Thiazolo(4,5-b)-quinoxalines and related compounds (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 421-427 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of 2,3,7-trichloroquinoxaline (1) or 2,3-dichloro-7-bromoquinoxaline (2) with thiourea in DMSO gave 6,6′-dichloro- or 6,6′-dibromodiquinoxalino[2,3-b:2′:3′-e]1,4-dithiien (3 or 4). However, 1 or 2 reacts with thiourea in ethanol to give (3 or 4) beside 7-chloro- or 7-bromo-2-imino-2,3-dihydrothiazolo[4,5-b] quinoxaline (5 or 6) respectively. Interaction of 1 or 2 with acetone thiosemicarbazone gave 7-chloro- or 7-bromo-3-amino-2-imino-2,3-dihydro-thiazolo[4,5-b] quinoxaline hydrochloride (13 or 14) respectively. Cyclization of 7-chloro- or 7-bromo-3-amino-2-imino-2,3-dihydrothiazolo[4,5-b]quinoxaline (15 or 16) on treatment with aromatic acid chlorides or isothiocyanates succeeded to give 19 - 21 or 28 and 29.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300312
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