Mononuclear copper(I) complexes of O-t-butyl-1,1-dithiooxalate and of O-t-butyl-1-perthio-1-thiooxalate

► Salt and Cu(I) complexes of O-t-butyl-1,1, dithiooxalate (i-dtotBu-) described. ► i-dtotBu- reacts with CuBr2 to give perthio-1-thiooxalato complex with short S-S bond.Crystal structures are reported for i-dtotBu- and each Cu(I) complex.