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1997 (1)
1989 (1)
1Author    V. Villa-B, F. Fischer3, J. ThiembRequires cookie*
 Abstract    e r ro e le k tris c h e F lü s s ig k r is ta ll-M is c h u n g e n m it K o h le n h y d ra t-D e riv a te n a ls D o tie r s to f f e Ferroelectric Liquid Crystal Mixtures with Carbohydrate Derivatives as Dopants For the first time carbohydrate derivatives were studied as dopants for calamitic smectic phases. Fast switching ferroelectric cells could be realized, and electroclinic effects were observed. By inversion of configuration at a chiral center of these compounds switching times, solubility, and helical twisting power vary by orders of magnitude. The studied derivatives showed modest solubil­ ity properties. 
  Reference    Z. Naturforsch. 44a, 675—679 (1989); eingegangen am 8. April 1989 
  Published    1989 
  Keywords    Ferroelectric liquid crystal mixtures, Carbohydrate derivatives, Diastereomeres, Switching time 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0675.pdf 
 Identifier    ZNA-1989-44a-0675 
 Volume    44 
2Author    Z. NaturforschRequires cookie*
 Title    Mechanismus der Cyclotrimerisierung von Phenylvinylketonen und die Kristallstrukturen von 1-((1R*,2S*,3R*,5S*)-und 1-((1R*,2S*,3R*,5R*)- 3.5-Dibenzoyl-2-hydroxy-2-phenylcyclohexylmethyl)-pyrrolidin-2-on  
 Abstract    T h e M e ch a n ism o f C y c lo trim e risa tio n o f P h e n y lv in y lk e to n e s a n d th e C ry sta l S tru c tu re s o f 1-((1R *,2S*,3R *,5S*)-an d 1 -((1 R * ,2 S * ,3 R * ,5 R *)-3 .5 -D ib e n zo y l-2 -h y d ro x y -2 -p h e n y lcy c lo h e x y lm e th y l)-p y rro lid in -2 -o n H . M ö h rle 3 *, R. W ille3, B. M id d e lh a u v e b, D. M o o tz b, H . W u n d e rlic h 1 5 H errn Prof. Dr. E. R eim ann zu m 60. G ebu rtstag g e w id m e t The cyclotrimerisation of l-phenyl-2-propyn-l-ol (1) with pyrrolidin-2-one (2) to the tri-benzoylcyclohexanes 4 and 5 produced -with modifications of the reaction conditions -the phenylvinylketone adducts 17 and 18 as intermediates and additionally the cyclohexylmethyl-pyrrolidin-2-ones 8 and 9. Obviously the mechanism consists of a primary attack of pyrroli-din-2-onat (2a) to a phenylketone (7) followed by a series of consecutive Michael reactions, which give rise to 4 and 5 as well as to 8 and 9. The latter two have been identified by X-ray crystal structure analyses. They crystallize in the monoclinic space group P2j/c, Z=4, with 8: a = 1786,8(6), b = 636.7(2), c = 2280.9(8) pm,y3 = 102.33(3)°; 9: a = 1119.9(7), b = 1165.1(3), c = 2198.6(5) pm, ß = 118.24(4)°. 
  Reference    Z. Naturforsch. 52b, 859—872 (1997); eingegangen am 16. April 1997 
  Published    1997 
  Keywords    Michael Reaction, Polysubstituted Cyclohexanes, Diastereomeres, Consecutive Reactions, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0859.pdf 
 Identifier    ZNB-1997-52b-0859 
 Volume    52