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1987 (1)
1984 (1)
1Author    Johann Sonnenbichler, Ifeanyi Madubunyi, Hugo ScheerRequires cookie*
 Title    Stereochemistry of Two Hydroxybiflavanonols from Garcinia cola Nuts  
 Abstract    The absolute configuration of two hydroxybiflavanonols from Garcinia cola nuts have been determ ined by CD and 500 MHz 'H NMR spectroscopy. A dditionally the occurrence of atrop-isomers at room tem perature as the consequence of rotational hindrance in the molecules could be dem onstrated. 
  Reference    Z. Naturforsch. 42c, 855 (1987); received March 30/May 18 1987 
  Published    1987 
  Keywords    Biflavanonol, Stereochem istry, A tropisom er, 'H NMR, Circular Dichroism 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0855.pdf 
 Identifier    ZNC-1987-42c-0855 
 Volume    42 
2Author    PaavoH. HynninenRequires cookie*
 Title    Electron Donor-Acceptor Properties of 10(S)-Chlorophyll a  
 Abstract    Evidence for the self-aggregation o f 10(S)-chlorophyll a (= chlorophyll a') in nonpolar solvents has been obtained by means o f absorption spectroscopy in the visible and infrared regions. The visible absorption spectrum of chlorophyll a' exhibits a shoulder at 680 nm in aliphatic hydrocar­ bon solvents and the infrared spectrum measured in carbon tetrachloride contains an "aggrega­ tion peak" at 1650 cm "1. IR spectroscopy shows, in addition, that the C-10 epim ers o f chlorophyll a are both present as monom ers in tetrahydrofuran. H ow ever, in the presence of a small amount o f aliphatic alcohol or water, the IR spectrum in tetrahydrofuran at lowered tem peratures exhibits an intense, wide absorption band at ~ 1650 cm -1 which was interpreted as arising from the hydrogen bonding o f the hydroxyl group to the C-9 keto carbonyl o f the chlorophyll. 
  Reference    Z. Naturforsch. 39b, 675 (1984); received July 12 1983 
  Published    1984 
  Keywords    Chlorophyll Epim ers, Chlorophyll Organization, Stereochem istry, Photosynthesis, Infrared Spectra, Absorption Spectra 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0675.pdf 
 Identifier    ZNB-1984-39b-0675 
 Volume    39