It′s all about the timing: Precise control of the residence time (tRx; see picture) of reactive intermediates in flow microreactors enables the reaction pathway of lithiated 1,2-dichloroethene to be switched to produce either alkenes or alkynes. This method also allows versatile syntheses of asymmetric disubstituted dichloroalkenes and alkynes.
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Nagaki et al. (2012) studied this question.
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