Minozzi et al. subsequently studied the suitability of a large family of heteroleptic Cu(I) PCs in this reaction and found that only four out of the 40 copper complexes tested could yield greater than 50% of the desired alkyne when using bromoalkynes as the coupling partner (Figure ), and only one of these complexes, [Cu(dq)(BINAP)]BF4 [dq = 2,2′-biquinoline and BINAP = (±)-2,2′-bis(diphenylphosphino)-1,1′-binaphthalene], could provide a yield greater than 70%. The reaction was conducted in THF over 24 hours using 394 or 450 nm LED flexible strips of 72 W per 5 m spool. No mechanistic studies were conducted, and the authors could find no correlation of the yield with the photophysical/electrochemical properties of the Cu(I) complexes.