:Deoxydehydration

Deoxydehydration (DODH) is a chemical reaction for removing two adjacent hydroxyl groups in a vicinal diol to form an alkene.{{Cite book|last1=Boucher-Jacobs|first1=Camille|last2=Nicholas|first2=Kenneth M.|date=2014|title=Deoxydehydration of polyols|journal=Topics in Current Chemistry|volume=353|pages=163–184|doi=10.1007/128_2014_537|issn=0340-1022|pmid=24756633|isbn=978-3-319-08653-8}} In contrast to hydrodeoxygenation which uses hydrogen as a reductant, deoxydehydration is able to use a variety of other reductants such as alcohols and organic phosphines.{{Cite book|title=Reaction Pathways and Mechanisms in Thermocatalytic Biomass Conversion II|last1=Liu|first1=Shuo|last2=Yi|first2=Jing|last3=Abu-Omar|first3=Mahdi M.|chapter=Deoxydehydration (DODH) of Biomass-Derived Molecules |date=2016|publisher=Springer, Singapore|isbn=9789812877680|series=Green Chemistry and Sustainable Technology|pages=1–11|language=en|doi=10.1007/978-981-287-769-7_1}} In research, the most common homogeneous catalysts for this reaction use rhenium.

Recently, research has focused on the use of vanadium heterogeneous catalysts for deoxydehydration, such as the conversion of 2,3-butanediol to butene.{{Cite journal|last1=Kwok|first1=Kelvin Mingyao|last2=Choong|first2=Catherine Kai Shin|last3=Ong|first3=Daniel Sze Wei|last4=Ng|first4=Joy Chun Qi|last5=Gwie|first5=Chuandayani Gunawan|last6=Chen|first6=Luwei|last7=Borgna|first7=Armando|date=2017-06-07|title=Hydrogen-Free Gas-Phase Deoxydehydration of 2,3-Butanediol to Butene on Silica-Supported Vanadium Catalysts|journal=ChemCatChem|language=en|volume=9|issue=13|pages=2443–2447|doi=10.1002/cctc.201700301|issn=1867-3880}} Although deoxydehydration over vanadium catalysts requires higher temperatures than over rhenium catalysts, the reaction can proceed without the need for hydrogen or external reductants, which can reduce waste products.{{Cite journal|last1=Petersen|first1=Allan R.|last2=Nielsen|first2=Lasse B.|last3=Dethlefsen|first3=Johannes R.|last4=Fristrup|first4=Peter|date=2018-01-08|title=Vanadium-Catalyzed Deoxydehydration of Glycerol Without an External Reductant|journal=ChemCatChem|language=en|volume=10|issue=4|pages=769–778|doi=10.1002/cctc.201701049|issn=1867-3880}}