Decaborane reduction

Other well-studied reactions of decaborane(14) include reduction to the dianion, deprotonation, and electrophilic substitution ... 

In many catalytic processes and transition metal mediated reactions, a-bor-ane complexes have been shown to be intermediates. The bis(borane) complex Cp2Ti( 72-HBcat/)2 (HBcaT = HBcat-4-f-Bu) is a highly active catalyst for the hydroboration of vinylarenes [37]. A mechanism, shown in Scheme 3, has been proposed for the Ti-catalyzed hydroboration on the basis of a detailed mechanistic study [37]. Theoretical calculations provided further support to the proposed reaction mechanism and showed that the reductive elimination step, giving the product molecules, is rate-determining [38]. In the Cp2Ti(CO)2 catalyzed hydroboration of alkynes [36,37], the proposed reaction mechanism (Scheme 4) also involves a a-borane complex similar to 11 and 14. In the titanium-catalyzed decaborane-olefin hydroborations [47,48], a-borane complexes were also considered as intermediates. In the Cp2MH (M = Nb, Ta) mediated hydroboration reactions of olefins [39,41], Smith and his coworkers observed several interesting cr-borane complexes, such as 21-23 discussed above. 

Reductive etherification. Benzyl ethers are generated from ArCHO on treatment with decaborane in an alcohol (e.g., MeOH, EtOH). 

Catalytic reduction in methanol using decaborane as the hydrogen source successfully saturates alkenes and alkynes and converts nitroarenes to arylamines. Concurrent A -alkylation to afford ArNHCHRR occurs when a carbonyl compound (RR C=0) is present. " ... 

Several oxidations and reductions involving boron hydrides and their anions, particularly of decaborane, have been carried out electro-chemically in aprotic organic solvents. " Decaborane reduces to a mixture of anions BioHfg and BioHig.c/o o-Decahydrodecaborate (2-) undergoes oxidative dimerisation. 

Other boron-rich building blocks with potential applications in BNCT or energy-filtering transmission electron microscopy have also been reported recently. For that, tetracarboranylketone was prepared from the reaction of a tetraalkynylated ketone and decaborane. The crystal structure is represented in Figure 27.16. Reduction of the ketone yielded the corresponding tetracarboranylalcohol. Afterward, the tetracarboranylalcohol was functionalized with small spacer molecules, such as a propylalcohol or... 

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