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of alkyne 15, a4n2d.50.01 eq. of thret Cu(I) catalyst (0.735.4mM) were used in THF-d89/MeOH (30:1 (1v3/v)). 2 17 Cycles wonere performed w42h.e5re one cyclerctonsisted of 90 min 3p.u9lsing at 20 kHz 1wFitohr 2a0l%l reaamcptiloitnusd1e.0ofe1q2.5oµfmazwiditeh...