The addition of (2-ethynyl-3-methoxy-2methylcyclopropyl)benzene to Tip 2 SiSiTipPh, a disilene with an asymmetric substitution pattern, was investigated. The regiochemistry of the ring-opened products indicates a stepwise mechanism with a biradical intermediate. The results are consistent with those obtained in similar experiments with symmetrically substituted disilenes.
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