Abstract
Two high yielding protocols for the dehydration of glycerol to acrolein have been designed using strong Bronsted acid immobilized on silica gels. Acrolein is obtained with yield ranging from 91 to 95% in organic solvent or under solvent free conditions. The optimized solventless protocol has been then adapted for the direct formation of divinylglycol from glycerol. Neo-formed acrolein is directly coupled to divinylglycol by a double addition process giving 72% of the target divinylglycol in 1 h at a 10 g scale. This process could be referred as a two-chamber reactor with no accumulation of acrolein. Moreover, the reaction rate can be monitored by the rate of glycerol addition, which allows securing the whole system.
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