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In an attempt to accelerate the decomposition of the intermediate and improve the yield of 2 and 9, a number of Lewis acids, nBu2BOTf, BF3.OEt2, Sc(OTf) 3, Sn(OTf)2, Yb(OTf)3, TiCl4, CuBr2, Fe(acac)3, Cu(acac)2, Ti(O iPr)4, Zr(OiPr)4, and Sn(2-ethylhexanoate)2) were screened both with and without the addition of Hunig's base, unfortunately to no avail
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2) were screened both with and without the addition of Hunig's base, unfortunately to no avail.
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