1997 organo-boron compounds

organo-boron compoundsS 0040

39 - 193A Novel Approach to an Oxoborane and Its Lewis Base Complex.— The 1,3,2,4-dithiastannaboretane (I) bearing an extremely bulky aryl groupon the boron atom reacts with dimethyl sulfoxide to form an oxoborane whichis stable as dimethyl sulfoxide complex (III) in solution. It reacts with thenitrile oxide (IV) to the 1,3-dipolar cycloadduct (V) and aqueous work-upgives the dihydroxyborane (VI). Interestingly, reaction of (I) with diphenylsulfoxide affords the dimer (VII). — (ITO, M.; TOKITOH, N.; OKAZAKI,R.; Tetrahedron Lett. 38 (1997) 25, 4451-4454; Dep. Chem., Fac. Sci., Univ.Tokyo, Bunkyo, Tokyo 113, Japan; EN)

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