Since the discovery of catalytic hydroboration[21 several groups have been investigating the scope of this reaction [']. In addition, interesting results related to the mechanism of this reaction were obtained14J, and two recent theoretical studies contributed to its under~tanding[~I. So far, catecholbordne has proved to be the most versatile borane compound for this purpose. Catalysis is usually achieved by phosphane complexes of late transition metals, e.g. Wilkinson's complex[61. However, nontransition metal catalysis is also It is conceivable that many other boranes besides catecholborane will be suitable for catalytic hydrob o r a t i~n [~~] , and optimal efficiency will not only depend on the borane component and on the transition metal compound, but also on the substrate to be hydroborated. This work presents results aimed at the synthesis of new stable boranes of the type (R0)2BH which may be useful in catalytic hydroboration.
1997organo-boron compounds, nonmetal heterocycles organo-boron compounds, nonmetal heterocycles S 0047
-199Contributions to the Chemistry of Boron. Part 236. In Quest of New and Stable Bis(organyloxy)boranes (RO)2BH for Catalytic Hydroboration.-The title compounds are tested quantitatively in the transition metal catalyzed hydroboration of cyclopentene and the dioxaborinane. Here, ( VIII) shows to be superior to the 1,3,2-dioxaborolanes (VI) and (XIV). -(LANG, A.; NOETH, H.; THOMANN-ALBACH, M.; Chem. Ber./Recl. 130 (1997) 3, 363-369; Inst. Inorg.
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