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The BF3·OEt2 mediated addition reactions of electron-rich arenes to 1,3-dialkoxyhepta-2,5-diyne(dodecacarbonyl)- tetracobalt complex 1 directly afford [7]metacyclophanediyne(dodecacarbonyl)tetracobalt complexes.
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Guo et al. (1999) studied this question.
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