Ac et one ▁But an ol ▁Eth an ol ▁fer ment ation ▁process ), ▁yield ing ▁ 3 ▁parts ▁of ▁ac et one , ▁ 6 ▁of ▁but an ol , ▁and ▁ 1 ▁of ▁eth an ol . ▁Ac et one ▁was ▁used ▁in ▁the ▁important ▁w art ime ▁task ▁of ▁casting ▁cord ite . ▁The ▁alco h ols ▁were ▁used ▁to ▁produce ▁vehicle ▁fu els ▁and ▁synth etic ▁rub ber . ▁ ▁Un like ▁ye ast , ▁which ▁can ▁dig est ▁only ▁sugar ▁into ▁alco hol ▁and ▁carbon ▁dio x ide , ▁C . ▁ac et ob ut y lic um ▁and ▁other ▁Clo str idia ▁can ▁dig est ▁whe y , ▁sugar , ▁st arch , ▁cell ul ose ▁and ▁perhaps ▁certain ▁types ▁of ▁l ign in , ▁yield ing ▁ ▁but an ol , ▁prop ionic ▁acid , ▁ ether , ▁and ▁g ly cer in . ▁ ▁In ▁gen etic ▁engineering ▁ ▁In ▁ 2 0 0 8 , ▁a ▁stra in ▁of ▁E scher ich ia ▁col i ▁was ▁gen et ically ▁engine ered ▁to ▁synth es ize ▁but an ol ; ▁the ▁gen es ▁were ▁derived ▁from ▁Clo str id ium ▁ac et ob ut y lic um . ▁In ▁ 2 0 1 3 , ▁the ▁first ▁micro b ial ▁production ▁of ▁short - chain ▁al kan es ▁was ▁reported ▁- ▁which ▁is ▁a ▁considerable ▁step ▁toward ▁the ▁production ▁of ▁gas oline . ▁One ▁of ▁the ▁cru cial ▁en zym es ▁- ▁a ▁fat ty