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'Hindered Rotation' in keywords
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1990 (1)
1975 (1)
1Author    Kirsten Vormann, Helmut Dreizler, Hans Hübner, Wolfgang HüttnerRequires cookie*
 Title    Methyl Internal Rotation Fine Structure in the Ground State Rotational Spectrum of Gauche Butane  
 Abstract    The methyl torsional fine structure in the rotational spectrum of gauche butane in the vibrational ground state was investigated in the frequency range between 10 and 141 GHz. Using the internal axis method (IAM) in the formulation of Woods, all internal rotation parameters were deter-mined with high accuracy. The barrier height of the methyl internal rotation was determined to 11.34 (29) kJ/mol (2.710 (69) kcal/mol). 
  Reference    Z. Naturforsch. 45a, 989 (1990); received May 18 1990 
  Published    1990 
  Keywords    gauche-butane, hindered rotation, methyl group, barrier height, rotational spectrum 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0989.pdf 
 Identifier    ZNA-1990-45a-0989 
 Volume    45 
2Author    1h NmRequires cookie*
 Title    H-NM R-und IR-spektroskopische Untersuchungen zur Konformation von Hydroxy - methyl-Substituenten in 2.3-Stellung an Hexachlorbicycloheptenen  
 Abstract    -an d IR -S pectroscopic C onform ational Studies on H ydro x y m eth y l S u b stitu en ts in th e 2,3 P ositions of H exachlorobicycloheptenes H e l l m u t S i n g e r *, I n g o l f S c h u p h a n ** u n d K a r l h e i n z B a l l s c h m i t e r Mono Hexachloro-bicycloheptenes and heptadienes with hydroxym ethyl-substituents in the 2 and 3 position show non-equivalence of the methylene protons in their NMR spectra. This is caused both by hindered rotation and the asymmetry of the molecules. For some molecules the spectroscopic data allow conclusions to be made concerning the con­ formation of the substituents. 
  Reference    (Z. Naturforsch. 30b, 373—377 [1975]; eingegangen am 9. Dezember 1974) 
  Published    1975 
  Keywords    -hydroxymethyl-bicycloheptenes, Bis-hydroxymethyl-bicycloheptenes, Heptadienes, Hindered Rotation, Hydrogen Bonding 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0373.pdf 
 Identifier    ZNB-1975-30b-0373 
 Volume    30