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Electronic optical activity of (−)‐α‐phellandrene
Author(s) -
Palmieri P.,
Poggi G.,
Vrbancich J.
Publication year - 1983
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.540040217
Subject(s) - twist , double bond , diene , chemistry , torsion (gastropod) , single bond , molecular geometry , allylic rearrangement , molecular physics , crystallography , computational chemistry , molecule , geometry , group (periodic table) , mathematics , medicine , biochemistry , natural rubber , surgery , organic chemistry , polymer chemistry , catalysis
Molecular orbital computations on the sign and magnitude of the Cotton effect of (−)‐α‐phellandrene (a conjugated diene) and the separate twisted butadiene chromophore were performed using configuration interaction (CI) and the random phase approximation (RPA) methods with a standard minimal basis set of STO/3G orbitals. The relative contributions to the rotatory strength of (−)‐α‐phellandrene which arise from a twist in the diene unit, the allylic axial bond, and nonplanarity of either one or both of the CC double bonds were determined by examining various molecular geometries. This theoretical study confirms that the allylic axial substituent/bond provides the largest contribution to the longwavelength Cotton effect. It is found that the rotatory strength arising from distortion of the planar geometry of the double bonds tends to cancel the rotatory strength arising from the sense of twist of the diene unit. The computed energies suggest that molecular geometries where the trisubstituted bond is kept planar, and where twisting is allowed about the cis double bond, may be favored over geometries where torsion is allowed about both double bonds.