- Aliphatic Liquid Crystals, 2. Some Nematic Derivatives of all-trans-Perhydrophenanthrene
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A stereoselective synthesis of the all-trans-7-alkylperhydro-2-phenanthrenols 15a-f in 11 steps and 28 liquid crystalline esters 16 of 15a-f are described, additionally some further derivatives of 7-alkylperhydro-2-phenanthrenol.An X-ray structure analysis of ester 16ec is reported.
- Sucrow, Wolfgang,Minas, Hermann,Stegemeyer, Horst,Geschwinder, Peter,Murawski, Hans-Ruediger,Krueger, Carl
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p. 3332 - 3349
(2007/10/02)
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- Liquid crystal substituted trans-4-n-alkylcyclohexanes and subst.-3-subst.-benzoyloxy-[trans-4-n-alkylcyclohexane]s
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The invention relates to liquid crystal nematic substances for electro-optical devices for the modulation of light, for the reproduction of numerals, signs and images as well as an orienting medium for spectroscopy and gas chromatography.It was found that compounds containing two or three rings, connected by carboxyl groups are new liquid crystal nematic substances of the general formula STR1 where R 1 =C n H 2n+1, CN; R 2 =C m H 2m+1, CN;R 3 =H, CH 3, C 2 H 5 Cl, Br; x=0 or 1; m,n=numbers from 1 to 10 are suitable for electro-optical arrangements for the modulation of transmitted or reflected light as well as for the reproduction of numeral signals and images, and further, as an orienting medium for spectroscopy and gas chromotography.Other liquid crystal substances or non-liquid crystalline substances, particularly dyes, may be added to the substances according to the invention.
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- ENZYMATIC "IN VITRO" REDUCTIONS OF KETONES. PART 12. REDUCTION OF 1-ALKYL-4-PIPERIDONES IN AN ETHANOL-NAD+-HLAD-SYSTEM.
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The steady state initial rate equation for a ketone-ethanol-NAD+-HLAD recycling system is checked for 1-n-butyl-4-piperidone.All reaction parameters are discussed in order to optimize the reduction of this substrate.For a series of 1-alkyl-4-piperidones the thermodynamic activation parameters for the reduction in this system are determined and discussed.
- Luppen, Jaymes Van,Lepoivre, Jozef,Lemiere, Guy,Alderweireldt, Frank
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p. 749 - 761
(2007/10/02)
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