Accession Number:

AD0434347

Title:

THE MICROWAVE SPECTRUM OF PROPIONALDEHYDE,

Descriptive Note:

Corporate Author:

HARVARD UNIV CAMBRIDGE MASS MALLINCKRODT LAB

Report Date:

1943-01-01

Pagination or Media Count:

32.0

Abstract:

The microwave spectrum of propionaldehyde, was investigated in the frequency region 8-38 Gc. The existence of two stable rotamers has been demonstrated. The cis rotamer, in chich the four heavy atoms are coplanar, is more stable by 900 100 calmole. An approximate treatment of the coupling of the -CH3 and C-C torsional motions in the cis rotamer is presented. Using this treatment the barrier to internal rotation in the cis rotamer is found to be 2280 cal mole. The dihedral angle in the higher energy, gauche, rotamer is about 131 degrees. Evidence is given for coupling of the C-C torsional momentum and overall rotational angular momentum in the gauche rotamer. Other aspects of the spectrum are also discussed. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE