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More than a monooxygenase: Cytochrome P450BM3 (CYP102A1) and its evolved variants have been found to desaturate a range of alkylbenzenes (see scheme). Desaturation levels are heavily influenced by the structural characteristics of the alkyl substituent. With cumene, α-hydroxylation yields are more severely impacted by α-deuteration than desaturation yields.
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Whitehouse et al. (2008) studied this question.
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