A simple, one-pot preparation of rhenium(I) sigma-arylalkynyl complexes is reported using thallium(I) hexafluorophosphate as a halogen abstraction agent. This new route to rhenium sigma-alkynyls enjoys higher yields compared to analogous preparations using silver salts by eliminating potential electrochemical degradation pathways.
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Liddle et al. (2007) studied this question.
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