Alkylidyne (carbaborane) complexes of the Group 6 metals. 9. The closo to hyper-closo transformations in a tungstacarborane cage system: crystal structure of [NEt4][W2(.mu.-CC6H4Me-4)(CO)2(.eta.5-7,8-Me2-7,8-C2B9H9)[.eta.6-7,8-Me2-7,8-C2B9H8-10-(CH2C6H4Me-4)]]

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