Journal
GREEN CHEMISTRY
Volume 14, Issue 3, Pages 702-706Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2gc16202d
Keywords
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Funding
- National Science Foundation, PIRE [0730277]
- Danish Ministry of Science, Technology and Innovation
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Conversions of various pentoses and hexoses into methyl lactate has been demonstrated for the Sn-Beta catalyst. It is found that pentoses are converted to methyl lactate in slightly lower yields (similar to 40%) than what is obtained for hexoses (similar to 50%), but higher yields of glycolaldehyde dimethyl acetal are observed for the pentoses. This finding is in accordance to a reaction pathway that involves the retro aldol condensation of the sugars to form a triose and glycolaldehyde for the pentoses, and two trioses for hexoses. When reacting glycolaldehyde (formally a C-2-sugar) in the presence of Sn-Beta, aldol condensation occurs, leading to the formation of methyl lactate, methyl vinylglycolate and methyl 2-hydroxy-4-methoxybutanoate. In contrast, when converting the sugars in water at low temperatures (100 degrees C), Sn-Beta catalyses the isomerisation of sugars (ketose-aldose epimers), rather than the formation of lactates.
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