Kinetic isotope effects for the C-H activation step in phase-transfer halogenations of alkanes.

Org Lett

Institut fur Organische Chemie der Georg-August Universitat, Tammannstrasse 2, D-37077 Gottingen, Germany, and Department of Organic Chemistry, Kiev Polytechnic Institute, 37 Pobeda Avenue 252056, Kiev, Ukraine.

Published: July 2000

Within the scope of phase-transfer halogenations (Br and I) of alkanes, significant H/D kinetic isotope effects (KIE = 4-5) indicate that hydrogen abstraction is rate limiting. The excellent agreement of computed and experimentally determined H/D KIE as well as trapping experiments support the involvement of trihalomethyl radicals in the activation step.

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http://dx.doi.org/10.1021/ol0059347DOI Listing

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