Photolysis of 'naphtho-o-carborane' in the presence of excellent hydrogen d
onors such as 1,4-cyclohexadiene leads to quantitative double hydrogen abst
raction. Other molecules, including supercoiled DNA, similarly act as hydro
gen atom donors towards photolyzed naphtho-o-carborane. A diradical interme
diate is proposed. (C) 2000 Elsevier Science Ltd. All rights reserved.