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
  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Optically Active, Aromatic Spiranes, 5. Stereochemistry of Metallocenes, 39. An Universal Method for the Preparation, and Determination of the Absolute Configuration and Enantiomeric Purity of Chiral 2,2′-SpirobiindanesFrom optically active tricarbonyl(1-oxoindane)chromium complexes 1 of known configuration and enantiomeric purity by reaction with phthalaldehydic esters 2 and hydrogenation of the benzal derivatives 4 chiral key compounds 5 and 6 for the preparation of 2,2′-spirobiindan-1,1′-diones are obtained. Cyclization of 6 yields diastereomers (cis- and trans-7) which after mild removal of Cr(CO)3 afford the enantiomeric biindanones 8 from which 2,2′-spirobiindanes 9 are accessible. Chiralities and enantiomeric purities of all spiranes can easily be deduced from those of the indanones 1. This universal principle is presented for several methyl- and methoxy-2,2′-spirobiindan-1,1′-diones and -biindanes.
    Notes: Aus optisch aktiven Tricarbonyl(1-oxoindan)chrom-Komplexen 1 bekannter Konfiguration und enantiomerer Reinheit werden durch Umsetzung mit Phthalaldehydsäureestern 2 und Hydrierung der Benzalderivate 4 chirale Schlüsselverbindungen 5 bzw. 6 zur Darstellung von 2,2′-Spirobiindan-1,1′-dionen erhalten. Ringschluß von 6 führt zu Diastereomeren (cis- und trans-7), die nach schonender Abspaltung von Cr(CO)3 die enantiomeren Biindanone 8 liefern, aus denen die 2,2′-Spirobiindane 9 zugänglich sind. Chiralität und enantiomere Reinheit aller Spirane folgen aus jenen der eingesetzten Indanone 1. Dieses universelle Prinzip wird anhand einiger Methyl- und Methoxy-2,2y-spirobiindan-1,1′-dione und -biindane präsentiert.
    Additional Material: 8 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...