is accompanied by the synthesis of 3mol ATP. During butanol fermentation the glycolytic reducing equivalents are reoxidized by reduction of butyryl-CoA to butanol via butyraldehyde. Therefore, 2mol hexose have to be oxidized to gain the electrons required. The spare acetoacetyl-CoA isconvertedtoacetoacetateandtheCoA is transferred to acetate, giving rise to acetyl-CoA and