Production of jet fuel intermediates from furfural
and acetone by aldol condensation over MgO/NaY.
While Figure 1 does not show an analysis for wine cubes, it is interesting to note the differences in furfural
content (butterscotch, caramel aromas) or the cube heavy toast reported by Nadalie.
It is the toasting of the oak, conversion from lignins to vanillins and glucose to methyl furaldehydes and cyclotenes, all as flavor additives, and rhanmose to furfurals
and trans-oak lactones to stabilize color and help with other wine reactions.
The ETS analysis found the Gamba barrel skewed dramatically to the sweet oak and butterscotch edge of the spectrum, with high amounts of 5-methylfurfural and furfural
and moderate (or about average) amounts of the lactone compounds.