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'Dipole Moments' in keywords Facet   section ZfN Section B  [X]
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1987 (1)
1979 (2)
1977 (1)
1Author    Requires cookie*
 Title    Three-membered Rings. Molecular Structure and Conformation of Aryl Substituted Oxiranes by Dipole Moment Measurements  
 Abstract    and C a r l o B a t t i s t i n i , B r u n o M a c c h i a , a n d F r a n c o M a c c h i a The electric dipole moments of some styrene and trans-and cis-stilbene oxides have been measured, in benzene. From these data some bond angles have been calculated and it has been deduced that in the styrene derivatives the phenyl group is in rapid interconversion about the bond with the triatomic ring. 
  Reference    (Z. Naturforsch. 32b, 1467—1472 [1977]; received April 22 1977) 
  Published    1977 
  Keywords    Styrene Oxides, Stilbene Oxides, Structure, Conformation, Dipole Moments 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-1467.pdf 
 Identifier    ZNB-1977-32b-1467 
 Volume    32 
2Author    Salvatore SorrisoRequires cookie*
 Title    Dielectric Measurements and Molecular Structure. Styrene Oxides and Phenylcyclopropanes  
 Abstract    The effects of electronic structure and conformation of the molecules YC6H4CHOCH2 1 1 (Y = o, m, and p-Cl) and Y'C6H4CHCCl2CH2 (Y' = o, and m-Cl) have been studied in benzene between 10.0 and 70.0 °C. In the oxirane systems the conjugation between the two rings is very small, if present at all; consequently, in the absence of steric and/or electrostatic hindrance internal rotation is observed. In the cyclopropane systems ex-amined these steric effects are sufficiently important to completely immobilise the molec-ular structure. 
  Reference    Z. Naturforsch. 34b, 1298—1302 (1979); received March 8/May 7 1979 
  Published    1979 
  Keywords    Styrene Oxides, Cyclopropanes, Conformation, Dipole Moments 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1298.pdf 
 Identifier    ZNB-1979-34b-1298 
 Volume    34 
3Author    Salvatore SorrisoRequires cookie*
 Abstract    The electric dipole moments of acetyldiazomethane (MeCOCHN2) and 1-acetyl-1-diazo-ethane (MeCOCMeN2) between 10 and 70 °C have been measured. Using appropriate group and bond moments, the concentrations of the two rotamers present in each have been calculated and, hence, the equilibrium constant for the cis trans equilibrium at the various temperatures. ^ The change in standard enthalpy (A H°), standard free energy (A G°) and standard entropy (A S°) are reported for the conversion of one mole of cis isomer to trans isomer. 
  Reference    Z. Naturforsch. 34b, 1530—1534 (1979); received May 17 1979 
  Published    1979 
  Keywords    Dipole Moments, Diazoketones, Thermodynamic, Dielectric Measurements 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1530.pdf 
 Identifier    ZNB-1979-34b-1530 
 Volume    34 
4Author    Bernd Kohne, Peer Marquardt, Klaus Praefcke, Panicos Psaras, Werner StephanRequires cookie*
 Title    Neuartige discotisch-flüssigkristalline, polare Monothioscyllitol-Derivate [1,2] Novel Discotic Liquid Crystalline, Polar Monothioscyllitol Derivatives [1,2]  
 Abstract    On the basis of an improved synthesis of the 1,3,4,5,6-pentaacetate of myo-inositol, now available in only one step from that cyclitol in yields up to 90%, we prepared various derivatives 3—5 of 1-deoxy-l-mercapto-scyllo-inositol (monothioscyllitol) via the mesylate la or the tri-fluoromesylate lb, respectively. The non-centrosymmtric disc-shaped thioethers 3a—h as well as their S,S-dioxides 4a—h and the S-oxide 5f exhibit thermotropic discotic mesophases over wide temperature ranges. The thermomesomorphism of these new sulfur compounds has been studied by optical microscopy and by differential scanning calorimetry. The pentabutyrates 3a and 4a as well as the dimesomorphic pentapentanoate 3 b exhibit a probably new type of discophase D, whereas all other monothioscyllitol derivatives with longer alkyl chains show the D ho -phase over wide temperature ranges. Of some selected new thioethers 3, sulfones 4, and of the sulfoxide 5f the dipole moments have been measured which are highest with the cyano derivatives 3g and 4g at about 5 or above 6 D, respectively. These values characterize them as the strongest polar discogens studied so far. The presented monothioscyllitol derivatives 3, 4 and 5 do not only increase the number of rarely known polar discogens, but also show that non-centrosymmetric and polar discotic liquid crystals with a small, alimonocyclic, saturated "core" now can be prepared easily. Their permanent electric dipole moments could give rise to interesting magnetic or electric field effects. 
  Reference    Z. Naturforsch. 42b, 628—642 (1987); eingegangen am 22. Dezember 1986 
  Published    1987 
  Keywords    Inositols, Cyclohexane Derivatives, Discogenes, Discophases, Dipole Moments 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0628.pdf 
 Identifier    ZNB-1987-42b-0628 
 Volume    42