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20) Vreugdenhil, W.; Haasnoot, J. G.; Schoondergang, M. F. J.; Reedijk, J. Inorg. Chim. Acta 1987, 130, 235 and references quoted therein. IntroductionHundreds of different icosahedral closo-carborane( 12) derivatives containing boron-element bonds (element = halogen, nitrogen, carbon, oxygen, sulfur, main-group and transition metals, etc.) have been synthesized over the last 25-30 years.l Direct electrophilic chlorination, bromination, and iodination is known to be an effective and convenient method for the preparation of boron halogenated 0-, m-, and p-carboranes2 Similarly, selective

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