You can prepare CuCl from CuSO4, copper wire and table salt by gently boiling all three together:
CuSO4(aq) + Cu(s) + 2 NaCl(aq) ===> 2 CuCl(s) + Na2SO4(aq)
CuCl precipitates as a white powder. Then dissolve in NH3 and filter. Lead acetylene through that solution and that should yield Cu(I) acetylide
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