Carbon-13 kinetic isotope effects. III. Temperature dependence of k12/k13 for 1-bromo-1-phenylethane alcoholysis | Zendy

Jan Bron | Zendy; J. B. Stothers | Zendy

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Carbon-13 kinetic isotope effects. III. Temperature dependence of k₁₂/k₁₃ for 1-bromo-1-phenylethane alcoholysis

Author(s) -

Jan Bron,

J. B. Stothers

Publication year - 1968

Publication title -

canadian journal of chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.323

H-Index - 68

eISSN - 1480-3291

pISSN - 0008-4042

DOI - 10.1139/v68-233

Subject(s) - chemistry , kinetic isotope effect , kinetic energy , carbon fibers , isotope , isotopes of carbon , thermodynamics , substitution (logic) , organic chemistry , deuterium , atomic physics , nuclear physics , physics , materials science , quantum mechanics , composite number , computer science , total organic carbon , composite material , programming language

The temperature dependence of k 12 /k 13 for methanolysis and ethanolysis at the α-carbon of 1-bromo-1-phenylethane has been determined over the ranges 25° and 45° respectively. It is found that the kinetic isotope effect increases with increasing temperature for these systems. This result offers support for earlier interpretations on the 13 C fractionations measured previously and the data are considered in terms of the original Bigeleisen equation. The results indicate that primary kinetic 13 C isotope effects may be useful for distinguishing between bimolecular and unimolecular substitution mechanisms.

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