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 Title    Photolysis (A = 185 nm) of Liquid Acetaldehyde Dimethyl Acetal  
 Abstract    H e in z -P e t e r S c h u c h m a n n a n d C l e m e n s v o n S o n n t a g In stitut fü r Strahlenchemie im M ax-Planck-Institut für Kohlenforschung, Mülheim a. d. R uhr Deaerated liquid acetaldehyde dimethyl acetal has been photolyzed at X = 185 nm, and 28 products have been determined. The m ajor ones with their quantum yields are: methanol (0.59), methane (0.26), ethyl methyl ether (0.17), m ethyl vin yl ether (0.16), m ethyl form ate (0.14), ketene dimethyl acetal (0.1), ethane (0.06), hydrogen (0.06), and acetaldehyde (0.06). The m ajor prim ary processes are suggested to be the scission o f the C-OCH3 bonds (homolytic and molecular) and o f the O-CH3 bonds (homolytic). Minor processes are hydrogen elimination reactions and the scission o f the C-CH3 bond. 
  Reference    (Z. Naturforsch. 32b, 205 [1977]; received October 8 1976) 
  Published    1977 
  Keywords    UV, GC-MS, Quantum yields, Radical Reactions, Fragm entation Processes 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0205.pdf 
 Identifier    ZNB-1977-32b-0205 
 Volume    32 
2Author    Requires cookie*
 Title    Beiträge zur Chemie der Pyrrolpigmente, X V II1  
 Abstract    Struktur-und konformationsanalytische Untersuchungen am chromophoren System der Bilivioline [Biladiene-(a.b)] On the Chemistry of Pyrrole Pigments, X V II Investigations of Structure and Conformation of the Chromophoric System of Biliviolines [Biladienes-(a,b)] H e i n z F a l k , S t e f a n G e r g e l y , K a r l G r u b m a y r u n d O t m a r H o f e r The {Z,Z)-configuration of the bilivioline chromophoric system was established in ­ vestigating an appropriate model compound by means of pK measurement, X H NMR spectroscopy Lanthanide ion induced shift technique, electron absorption spectroscopy and P P P calculations. Moreover a syn-syn conformation which is twisted at the a-methine single bond and planar within the pyrromethene unit (based on the concept of partial structures of bile pigments) of the molecule was deduced. 
  Reference    (Z. Naturforsch. 32b, 299—303 [1977]; eingegangen am 12. November 1976) 
  Published    1977 
  Keywords    !H NMR, Lanthanide Shifts, PP P calculations, UV, Tautomeric Equilibrium 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0299.pdf 
 Identifier    ZNB-1977-32b-0299 
 Volume    32