Boronates, dinuclear structures

Few examples have been reported of metals coordinated to six-membered boron-sulfur heterocycles. Ashe et al. prepared 4-methyl-l,4-thiaborin (SC4H4BMe) which forms a stable molybdenum tricarbonyl sandwich complex 144.158 jn g etjert s laboratory, the reaction of the diborolyl complex 33 (Section 3.01.3.2) with COS afforded the dinuclear complex 145 whose structure was determined crystallographically.36 Other products, not involving boron-sulfur heterocycles and hence outside the scope of this discussion, were obtained via the treatment of 33 with different sulfur reagents such as CS2.36... 

Structure of a dinuclear heterometallic methoxide derivative containing lithium and boron, (MeOH)2Li(/x-OMe)2B(OMe)2 (Fig. 13), was detemiined by the X-ray diffraction method (124) both lithium and boron atoms were found to be four coordinate. 

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