Boron compounds oxoacids

SULFICYLBIS (METHANE) (67-68-5) CjHjOS (CH3)2S0 Combustible liquid [explosion limits in air (vol %) 2.6 to 63.0 flashpoint 203°F/95°C oc autoignition temp 419°F/215°C Fire Rating 2]. Violent or explosive reaction with strong oxidizers, acryl halides, aryl halides and related compounds, alkali metals p-bromobenzoyl acetanilide, boron compounds, especially hydrides iodine pentafluoride, magnesium perchlorate, methyl bromide, perchloric acid, periodic acid, silver fluoride, sodium hydride, potassium permanganate. Forms powerfully explosive mixtures with metal salts of oxoacids [iron(III)nitrate, phosphonic acid, sodium perchlorate]. On small fires, use dry chemicals or COj extinguishers. 

Investigations of the oxoacidic properties of boron(III) compounds in molten Nal and KCl-NaCl at 700 °C were reported by Cherginets and... 

As organic acids are polar, thermally unstable, and have low volatility, it is necessary for GC analysis to convert them into nonpolar, volatile, and thermally stable derivatives. Such derivatization is usually achieved by esterification. The most common method is trimethylsilylation with A,0-bis(trimethylsilyl)trifluoroacet-amide (BSTFA) containing 1% trimethylchlorosilane. However, methylation with diazomethane or methanolic hydrogen chloride/boron trifluoride in methanol is also possible [19,20]. The derivatization to other esters has also been reported, but is rather uncommon in routine analysis [21]. Oxoacids should be stabilized by formation of an oxime prior to the esterification described above. Otherwise, formation of multiple/nonstable derivatives would greatly impair the determination of this class of compounds. The oximes can then react with BSTFA to yield TMS-oxime TMS esters. 

---