Paper

Chem. Commun., 1996, 2033 – 2034, DOI: 10.1039/CC9960002033

Crystallographic evidence for the diene character of C₂B₁₀H₁₀C₄H₄(benzocarborane) and a Diels–Alder reaction of its anionic nido-analogue, [C₂B₉H₁₀C₄H₄]^–: crystal structures of C₂B₁₀H₁₀C₄H₄ and C₂B₁₀H₁₀C₄H₆

Royston C. B. Copley, Mark A. Fox, Wendy R. Gill, Judith A. K. Howard, J. A. Hugh MacBride, Richard J. Peace, Graham P. Rivers and Kenneth Wade

Single-crystal X-ray diffraction studies on [C₂B₁₀H₁₀C₄H₄]( ‘ benzocarborane ‘ ) and C₂B₁₀H₁₀C₄H₆( ‘ dihydrobenzocarborane ‘ ) show that the C₆ rings of each posses localised double bonds and this has been confirmed by bond-order calculations: the nido-anion. [C₂B₉H₁₀C₄H₄]^– synthesised from C₂B₁₀H₁₀C₄H₄, with maleic anhydride forms a Diels-Alder adduct.

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