Hydridic hydrogen organoboron compounds

Oxidative addition [1, 38] of 1-alkenyl, i-alkynyl, allyl, benzyl, and aiyl halides to a palladium(O) complex affords a stable rra .s-<7-palladium(II) complex (11). The reaction proceeds with complete retention of configuration for alkenyl halides and with inversion for allylic and benzylic halides. Alkyl halides having /3-hydrogens are rarely useful because the oxidative addition step is very slow and may compete with /3-hydride elimination from the a-organopalladium(II) species. However, it has been recently shown that iodoalkanes undergo the cross-coupling reaction with organoboron compounds (Section 2.4.5). 

Although they are not classified as organoboron compounds, boron hydrides, chloroboranes, boron halides and boric acid esters are discussed in the first part of this chapter as also is the determination of hydridic and active hydrogen in these types of compounds. 

Table 38, Determination of Hydridic Hydrogen in Organoboron Compounds...

The term carborane generally designates a carbon-boron-hydrogen system in which both the carbon and boron atoms are incorporated into a skeletal network. In comparison, the carbon atoms of compounds designated as organoboron hydrides are generally of a ligand nature. The use of the prefix dovo has been su ested for the closed polyhedral carboranes (e.g.. Fig. 1) which, in addition, are named as derivatives of boron hydrides 11). 

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