trimethyl borate oor Indonesies
trimethyl borate
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Trimethyl borate, which is debatably not an organoboron compound, is an intermediate in the production of sodium borohydride.
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Current methods involve reduction of trimethyl borate with sodium hydride.
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Trimethyl borate, B(OCH3)3, is used as a precursor to boronic esters for Suzuki couplings: Unsymmetrical borate esters are prepared from alkylation of trimethyl borate: ArMgBr + B(OCH3)3 → MgBrOCH3 + ArB(OCH3)2 ArB(OCH3)2 + 2H2O → ArB(OH)2 + 2HOCH3 These esters hydrolyze to boronic acids, which are used in Suzuki couplings.
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In the Brown-Schlesinger process Sodium borohydride is industrially prepared following the original method of Schlesinger: sodium hydride (produced by reacting Na and H2) is treated with trimethyl borate at 250–270 °C: B(OCH3)3 + 4 NaH → NaBH4 + 3 NaOCH3 Millions of kilograms are produced annually, far exceeding the production levels of any other hydride reducing agent.
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4 sinne gevind in 2 ms. Hulle kom uit baie bronne en word nie nagegaan nie.