Boese, Roland; Haumann, Thomas; Jemmis, Eluvathingal D.; Kiran, B.; Kozhushkov, Sergei; de Meijere, Armin:
Geometries of three-membered rings in triangulanes and spirocyclopropanated bicyclopropylidenes: Experimental studies and a general bond increment scheme.
1996
In: Liebigs Annalen, Heft 6, S. 913 - 919
Artikel/Aufsatz in Zeitschrift1996Chemie
Titel:
Geometries of three-membered rings in triangulanes and spirocyclopropanated bicyclopropylidenes: Experimental studies and a general bond increment scheme.
Autor(in):
Boese, RolandLSF; Haumann, Thomas; Jemmis, Eluvathingal D.; Kiran, B.; Kozhushkov, Sergei; de Meijere, Armin
Erscheinungsjahr
1996
Erschienen in:
Titel:
Liebigs Annalen
in:
Heft 6, S. 913 - 919
ISSN:

Abstract:

Crystal structural studies of several linear and branched triangulanes as well as spiro-cyclopropanated bicyclopropyridines by x-ray diffraction reveal significant differences between proximal and distal bond lengths in the 3-membered rings. Combined with previously published structural data, a general additivity scheme describing the geometry of such hydrocarbons was elaborated. The p donor spirocyclopropane and a double bond shorten the proximal bonds by 0.0234 and 0.0327 .ANG. and lengthen the distal bonds by 0.0227 and 0.0327 .ANG. with respect to the unperturbed value of 1.5008 .ANG.. The results of these calcns. were compared with those obtained by semiempirical and ab initio methods and explained qual. by using the fragment MO (FMO) approach.