A series of 10 lines in the Raman spectrum of 1,3hyphen;butadiene has been observed and assigned as torsional overtones. An analysis of the data leads to a potential of the formV(fgr;) =J4i=1(Vi/2) (1 minus; cosifgr;). The less stable species is found to be in thecisconfiguration with acisndash;transenergy difference of 873 cmminus;1. The barrier fortransrarr;cisinterconversion was found to be 2504 cmminus;1.
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