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Enthalpy and Entropy in Ring Closure Reactions

✍ Scribed by Felice C. Lightstone; Thomas C. Bruice

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 228 KB
Volume: 26
Category: Article
ISSN: 0045-2068
DOI: 10.1006/bioo.1998.1096

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✦ Synopsis

The strain and entropy effects of the lactone formation from Ͷ-bromoalkane-carboxylate ions in ring sizes 3 to 23 is reevaluated. We find that ⌬H ‡ is the largest contributor to the observed rates (⌬G ‡ ) for ring sizes 3 to 6, while ϪT ⌬S ‡ has little influence, ϪT ⌬S ‡ has more effect on the observed rates for ring sizes 8 and larger.

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