Halides boranes

Phosphine itself will react directly with borane halides or diborane. Unlike phosphine, PH3, borane, BH3 is very difficult to isolate and it is usually formulated as the dimer. This dimer (9.11) dissociates and behaves as the monomer in most of its reactions. 

The main chemical products produced from these minerals are (a) boron oxides, boric acid and borates, (b) esters of boric acid, (c) refractory boron compounds (borides, eu .), (d) boron halides, (e) boranes and carbaboranes and (f) organoboranes. The main industrial and domestic uses of boron compounds in Europe (USA in parentheses) are ... 

Figure 6.23 Fluorine-19 nmr spectra of mixtures of boron halides showing the presence of mixed fiuorohalogeno-boranes.

Acyl halides are reduced to alcohols by L1A1H4 or NaBH4, as well as by other metal hydrides (Table 19.5), but not by borane. 

Reaction of halo ketones or diazo ketones with boranes 10-112 Carbonylation of alkyl halides... 

Addition of unsaturated boranes to methyl vinyl ketones Hydrocarboxylation of triple bonds Addition of acyl halides to triple bonds 1,4-Addition of acetals to dienes... 

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