Scavenging of 1,4-Biradicals by Bis(acetylacetonato)copper(II). The Importance of Paramagnetic Effects

Article abstract of DOI:10.1021/j100210a042

Cu(acac)2 is shown to interact with the triplet biradical (CH3)2C^.CH2CH2C^.(OH)C6H5 promoting its intersystem crossing to the product forming singlet species.The scavenging of the biradicals does not lead to any new products, but the product ratios (cyclobutanol and acetophenone) are modified, showing that paramagnetic scavengers can exert some control on the conformation of the nascent singlet biradical.The rate of scavenging in methanol at 27 deg C is 2.0E9 M^-1 s^-1, as determined by laser flash photolysis.