ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Collection
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 3492-3497 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chiral Induction in Photochemical Reactions, VI.  -  Asymmetric Control of the Addition of Hemipinacol Radicals to Chiral Maleates and FumaratesThe photocatalysed addition of 2-propanol (2) to the monoesters of maleic acid 1b and 1d yields the esters of terebic acid 5b und 5d with a diastereoselectivity up to 62% de. The major diastereomer 5d has (2S)-configuration. Diastereoselectivity of 23% maximum are observed by applying the (-)-menthyl diesters of maleic or fumaric acid 1c and 1e. The product obtained is the acyclic diaterebic acid ester 4c.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chiral Induction in Photochemical Reactions, VII.  -  Diasteroselective Photo-Aldol Reaction on Chiral α-keto esters with 2,3-DihydrooxazolesPhotochemical reactions of 2 as well as 35 with chiral phenyl-glyoxylic esters or chiral pyruvic esters, respectively, according to Paterno-Büchi are described. Solvolysis of the oxetanes yields erythro sugar or erythro α-amino sugar synthons, respectively. The diastereoselectivity is above 95% with phenylglyoxylic acid (-)-8-phenylmenthyl ester. The configurations of the products indicate the re-attack of 2 resp. 35 to the prochiral 3(nη*)-excited carbonyl group.
    Notes: Die photochemischen Reaktionen von 3-Acetyl-2,3-dihydro-2,2-dimethyloxazol (2) und 2,3-Dihydro-2,2-dimethyl-3-oxazolcarbonsäure-methylester (35) mit chiralen Phenylglyoxylsäure- und Brenztraubensäureestern im Sinne einer Paterno-Büchi-Reaktion werden beschrieben. Dabei bilden sich nach der Oxetanringöffnung erythro-Zucker- bzw. erythro-α-Aminozucker-Synthone. Die Diastereoselektivität liegt beim Phenylglyoxylsäure-[(-)-8-phenylmenthyl]ester über 95%. Die Konfiguration der Produkte zeigt einen re-Angriff von 2 bzw. 35 auf die prochirale 3(nη*)-angeregte Carbonylgruppe.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...