passages.id: split_9_validation_526_passage
passages.type: progene_text
passages.text: The reaction of [(BIT(OH,SMe ) ) Cu(CH3CN)]PF6 ( 2a ) with dioxygen produces [(BIT(O,SOMe ) ) 2Cu2(DMF)2](PF6)2 (4) , whose X - ray structure revealed the presence of bridging BIT - alkoxo ligands and terminal - SOMe groups .