ISSN:
1434-4475
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Dipole-dipole coupling of the indane fragments in 5,5′-disubstituted 2,2′-spirobiindanes is predominantly responsible for the origin of optical activity in the1La-electronic transition only if both ligands exhibit strong interaction with the aromatic nuclei. This mechanism does not contribute essentially to the1Lb-Cotton effect. The band-splittings of the couplet as well as the rotational strengths of the transitions ofA andB symmetry-type in the1La-Cotton effect are in accordance with a rough calculatory estimation. The absolute configuration thus determined agrees with the chirality recently deduced by chemical methods. The rotational strengths of the1W-Cotton effect of the carbonyl derivatives4, 5, 12, 13, and15 located at appr. 320 nm are remarkably low. This can be explained on the basis of conformational considerations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00907320
