The stable borylene-bridged Mn2 complexes 1 and 2 are formed in the reaction of K[(η5-C5H4R)-Mn(SiMePh2)(CO)2] with the diboranes(4) B2X2Cl2. The mechanism of formation still remains to be clarified. The molecular structure of 1 (R = H) shows similarities with dimetallacyclopropane derivatives.
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Braunschweig et al. (1995) studied this question.
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