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'Optical Activity' in keywords Facet   Publication Year 1978  [X]
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1Author    WolfJürgen RichterRequires cookie*
 Title    Experimentelle Prüfung von Näherungsansätzen für Chiralitätsfunktionen am Beispiel der optischen Aktivität von Methan-Derivaten im Transparenzgebiet II Semiempirical Use of Chirality Functions for the Description of the Optical Activity of Methan Derivatives in the Transparent Region II  
 Abstract    Simple alcohol derivatives are used to test approximative chirality functions experimen-tally. The approximations of the type 1 b yield a competent description of the optical rotatory power of methan-derivatives. Provided that certain restrictions of ligand inter-actions are taken into account, a set of ligand-specific parameters is obtained; however, no common set of parameters is suitable for both the alcohol and the amino-alcohol derivatives, which have been published before. 
  Reference    Z. Naturforsch. 33b, 165—172 (1978); eingegangen am 21. November 1977 
  Published    1978 
  Keywords    Chirality Functions, Optical Activity, Methan Derivatives 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0165.pdf 
 Identifier    ZNB-1978-33b-0165 
 Volume    33 
2Author    Henri Brunner, Manfred Muschiol, Wilfried NowakRequires cookie*
 Title    Optisch aktive Übergangsmetall-Komplexe, LVII [1]  
 Abstract    (+)-und (—)-C5H5M(CO)(P02R*)X mit M = Fe, "Fe und X = 1, COCH3, CH3 Optically Active Transition Metal Complexes, LVII [1] (+)-and (—)-C5H5M(CO)(P02R*)X with M = Fe, "Fe, and X = I, COCH3, CH3 In the reaction of C5H5Fe(CO)2l and CsHsFefCO^CHa, respectively, with S-(+)-(C6H5)2PN(CH3)CH(CH3)(C6H5) (abbreviated P02R*) the complexes C5H5Fe(CO)(P02R*)I(l),C5H5Fe(CO)(P02R*)COCH3(2),andC5H5Fe(CO)(P02R !,t)CH3(3) are formed as pairs of diastereoisomers the components of which differ only in the configu-ration at the iron atom. CsH5Fe(CO)(P02R*)CH3 (3) can be obtained in higher yield by photochemical decarbonylation of C5H5Fe(CO)(P02R*)COCH3 (2). The (+)s85-and (—)365-diastereoisomers of each pair exhibit different chemical shifts in the X H NMR spectra. Diastereoisomer separation can be achieved by fractional crystallization. Starting with 57 Fe metal (—)365-C5H5 57 Fe(CO)(P02R*)I was prepared via 57 FeI2, 57 Fe(CO)4l2, C5H5 57 Fe(CO)2l, and C5H5 57 Fe(CO)(P02R*)I in order to demonstrate optical activity of a 57 Fe compound in the y region by Mössbauer polarimetry in later experiments to be reported elsewhere. 
  Reference    Z. Naturforsch. 33b, 407—411 (1978); eingegangen am 24. Januar 1978 
  Published    1978 
  Keywords    Diastereoisomer Separation, X H NMR, Optical Activity, Transition Metal Complexes 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0407.pdf 
 Identifier    ZNB-1978-33b-0407 
 Volume    33 
3Author    Henri Brunner, Heinz VogtRequires cookie*
 Title    Optically Active Transition Metal Complexes, LIX [1]  
 Abstract    The pair of diastereoisomers (+)436-and (—)436-C5H5Fe(CO)(COCH3)P02R*, with P02R* = (S)-(+)-(C6H5)2PN(CH3)CH(CH3)(C6H5), can be separated into its components by preparative liquid chromatography under pressure. On heating (+)436-C5H5Fe(CO)-(COCH3)P02R* equilibrates with C5H5Fe(CO)2CH3 and P02R* before epimerization at the Fe [atom takes place. In the same way, the equilibrium C5H5Fe(CO)(COCH3)P(C6Hs)3 C5H5Fe(CO)2CH3 + P(C6Hs)3 can be obtained starting from either side. It is shown that the decarbonylation C5H5Fe(CO)(COCH3)P(C6H5)3 C5H5Fe(CO)(CH3)P(C6H5)3 + CO is not a thermal but a photochemical reaction. 
  Reference    Z. Naturforsch. 33b, 1231—234 (1978); eingegangen am 6. Juli 1978 
  Published    1978 
  Keywords    Diastereoisomer Separation, Preparative Liquid Chromatography, 1 H NMR, Optical Activity, Transition Metal Complexes 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1231.pdf 
 Identifier    ZNB-1978-33b-1231 
 Volume    33