期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 82, 期 1, 页码 78-82出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2007.12.008
关键词
levoglucosan; pyrolysis; boric acid; phenylboronic acid; borate; boronate; thermal stability
The influence of boric acid or phenylboronic acid on thermal conversion of levoglucosan in acidic sulfolane was studied. Although levoglucosan was converted to levoglucosenone, furfural and 5-hydroxymethyl furfural (total yield: similar to 40 mol%) at 200 degrees C in sulfolane containing 0.1wt% H2SO4, addition of boric acid enormously lowered the yields of these, and instead caused the formation of a stable complex in more than 70 mol% yield. Thus, boric acid substantially suppressed the acid-catalyzed dehydration and formation of furfurals from levoglucosan through complex formation. From the H-1 NMR spectrum, the chemical structure of this complex was confirmed as alpha-D-glucofuranose cyclic 1,2:3,5-bisborate, which was readily hydrolyzed quantitatively to glucose by the addition of water. Phenylboronic acid also exhibited similar influences. (C) 2008 Elsevier B.V. All rights reserved.
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