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The lithiation reagent and temperature may be the key factors controlling the 1,3-lithium shift of propargylic/allenylic lithium (see scheme). Under the right conditions, 1,1-diarylallenes and 1,3-diarylallenes can be easily and highly selectively synthesized by the lithiation of 1-aryl-1-alkynes and the subsequent transmetalation (1), and Pd-catalyzed coupling with aryl halides (2).
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Ma et al. (2004) studied this question.
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