SELECTIVE FLUORINATION OF ORTHO-CARBORANES AND META-CARBORANES - SYNTHESIS OF 9-MONOFLUORO-ORTHO-CARBORANE, 9,12-DIFLUORO-ORTHO-CARBORANE, 1,8,9,12-TRIFLUORO-ORTHO-CARBORANE, AND 8,9,10,12-TETRAFLUORO-ORTHO-CARBORANE AND 9-MONOFLUORO-META-CARBORANE, AND 9,10-DIFLUORO-META-CARBORANE - MOLECULAR-STRUCTURE OF 8,9,10,12-TETRAFLUORO-ORTHO-CARBORANE

Reaction of o- and m-carboranes 1 1 o-Carborane, 1,2-dicarbaclosododecaborane (12) = o-C2H2B10H10; m-carborane, 1,7-dicarbaclosododecaborane (12) = m-C2H2B10H10 with antimony pentafluoride results in replacement of hydrogen by fluorine at the boron atoms, to give in succession 9-fluoro-; 9,12-difluoro-; 8,9,12-trifluoro-; 8,9,10,12-tetrafluoro-o-carboranes and 9-fluoro-; 9,10-difluoro-m-carboranes. An X-ray structural study of the 8,9,10,12-tetrafluoro-o-carborane has been carried out. The compounds synthesized have been characterized by elemental analysis and 1H, 11B{1H}, 19F NMR spectroscopy. © 1990.