Use of crown ethers to isolate intermediates in ammonia-borane dehydrocoupling reactions
CHEMICAL COMMUNICATIONS（2016）
Abstract
The presence of 18-crown-6 in the Lewis acid-promoted dehydrocoupling reaction of ammonia borane permits isolation of [(THF)BH2NH3](+) and [BH2(NH3)(2)](+) cations. [(THF)BH2NH3](+) reacts with Lewis bases to give either boron adducts or by deprotonation at nitrogen to give borazine and ammonia-borane.
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Key words
crown ethers,ammonia-borane
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