Photolysis of 'naphtho-o-carborane' under oxygen leads to the quinone, 5,8-
diketonaphthocarborane. Photolysis in the presence of hydrogen donors such
as acetonitrile or 1,4-cyclohexadiene leads both to the quinone and 5-ketod
ihydronaphthocarborane. By contrast, photolysis of 'benzocarborane' under s
imilar conditions leads only to a highly stereo- and regiospecific dimeriza
tion. (C) 2000 Elsevier Science Ltd. All rights reserved.