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A new halopropargylation of alkynes promoted by boron trihalides has been developed. Reactions of (Z)-2-halo-1-vinylboron dihalides (generated in situ via reaction of alkynes with boron trihalides) with lithium propargyloxides in CH2Cl2 at room temperature produce the corresponding (Z)-1-halo-1,4-enynes in modest to good yields.
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Kabalka et al. (2004) studied this question.
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