passages.id: split_4_validation_530_passage
passages.type: progene_text
passages.text: Oxygenation of copper(I) complex 13b derived from the BIT(OMe,SBu-t) ligand is slow , relative to 2b , producing a mixture of ( BIT ( OMe , SBu - t ) ) 2Cu2 ( mu-OH)2 - type complexes 14b and 15b in which the - SBu - t group is uncoordinated ; one of these complexes ( 15b ) has been ortho - oxygenated on a neighboring aryl group according to the X - ray analysis and characterization of the free ligand .