ZfN: Search Results

1	Author	Kirsten Vormann, Helmut Dreizler, Hans Hübner, Wolfgang Hüttner	Requires 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

2	Author	1h Nm	Requires 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