DYNAMIC BEHAVIOR OF ,8'-DIHYDRO-4,4'-BICYCLO-HEPTA[DEF]FLUORENYLIDENE, A SUBSTITUTED BIFLUORENYLIDENE

Authors
GRIESER U HAFNER K
Citation
U. Grieser et K. Hafner, DYNAMIC BEHAVIOR OF ,8'-DIHYDRO-4,4'-BICYCLO-HEPTA[DEF]FLUORENYLIDENE, A SUBSTITUTED BIFLUORENYLIDENE, Tetrahedron letters, 35(42), 1994, pp. 7759-7762
Citations number
14
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Tetrahedron letters → ACNP
ISSN journal
00404039
Volume
35
Issue
42
Year of publication
1994
Pages
7759 - 7762
Database
ISI
SICI code
0040-4039(1994)35:42<7759:DBO,>2.0.ZU;2-J
Abstract
The chiral title compound 5 has been synthesized by reductive coupling of rt-butyl-4-oxo-4,8-dihydrocyclohepta[def]fluorene. (4). The free e nthalpy of activation of the racemization of 5 was determined to 62.9 +/- 0.8 kJ/mol by variable temperature NMR spectroscopy.