Sulfur hydrides boron halides

Dimethylsulfoxide Acyl and aryl halides, boron compounds, bromomethane, nitrogen dioxide, magnesium perchlorate, periodic acid, silver difluoride, sodium hydride, sulfur trioxide... 

Boron substituents in the [l,3,2]diazaborolo[l,5- ]pyridine derivative 109 were studied. This compound was obtained via reduction of its precursor 108 with sodium amalgam (Scheme 27). The bromide attached to the boron atom was further displaced with various halide, hydride, sulfur, and carbon nucleophiles <2001JCD378>. [l,2,5]thiadiazolo[2,3- ]pyridine derivative 110 was deprotected (R = Cbz to R=H) by classical hydrogenolysis <2002AGE3866>. 

Preparation and Uses. Boric acid can be prepared in the laboratory by acid hydrolysis of a variety of boron compounds, including halides, esters, salts, and hydrides. It is prodnced commercially by reactions of snlfinic acid with sodium borates in the United States, and with sodium and calcium borates in Turkey. In Sonth America, boric acid is prodnced by reaction of sulfuric acid with ulexite, a mixed sodium-calcium borate. Boric acid is also produced in Rnssia from the borosilicate mineral datolite. 

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