Croatica Chemica Acta, Vol. 72 No. 1, 1999.
Preliminary communication
A Case of Concerted Formation of Five and Six Member Rings; Solvolytic Behavior of 1-Aryl-1-chloro-4,8,13,17,21-pentamethyl-4,8,12,16,20-docosapentaenes
Ivica Malnar
; Faculty of Pharmacy and Biochemistry, University of Zagreb, A. Kova~i}a 1, P. O. Box 156, 10000 Zagreb, Croatia
Olga Kronja
; Faculty of Pharmacy and Biochemistry, University of Zagreb, A. Kova~i}a 1, P. O. Box 156, 10000 Zagreb, Croatia
Abstract
Chlorides 1 (1-aryl-1-chloro-4,8,13,17,21-pentamethyl-4,8,12,16,20-docosapentaenes) with various phenyl substituents were prepared, and solvolysis rates were measured in 80% (v/v) aqueous ethanol, and in 97% (w/w) aqueous 2,2,2-trifluoroethanol. Hammett ρ+ values obtained are -2.18, -2.13, resp., suggesting a concerted bicyclization in the rate determining step.
Keywords
Hrčak ID:
132140
URI
Publication date:
1.3.1999.
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