In 2018, Collins and co-workers reported a copper (I) catalyzed reductive Csp3-Csp cross-coupling between N-(acyloxy)phthalimides and bromoalkyne under blue light (Figure ). They synthesized and screened a wide variety of heteroleptic diamine-diphosphine copper (I) complexes for the transformation, identifying [Cu(dq)(BINAP)]BF4 as the most effective catalyst which delivered the desired product in 87% yield. The absence of light and photocatalyst ceased product formation depicting their necessity in the reaction.