H 6 O ). ▁ ▁Production ▁Indust ri ally , ▁fur an ▁is ▁manufact ured ▁by ▁the ▁p all ad ium - catal yz ed ▁dec ar b ony lation ▁of ▁fur f ural , ▁or ▁by ▁the ▁co pper - catal yz ed ▁ox id ation ▁of ▁ 1 , 3 - but ad iene : ▁ ▁In ▁the ▁labor atory , ▁fur an ▁can ▁be ▁obtained ▁from ▁fur f ural ▁by ▁ox id ation ▁to ▁ 2 - f uro ic ▁acid , ▁followed ▁by ▁dec ar box yl ation . ▁It ▁can ▁also ▁be ▁prepared ▁directly ▁by ▁thermal ▁decomposition ▁of ▁pent ose - cont aining ▁materials , ▁and ▁cell ulos ic ▁sol ids , ▁especially ▁p ine ▁wood . ▁ ▁Syn thesis ▁of ▁fur ans ▁The ▁Fe ist – Ben ary ▁synth esis ▁is ▁a ▁classic ▁way ▁to ▁synth es ize ▁fur ans , ▁although ▁many ▁synth eses ▁have ▁been ▁developed . ▁One ▁of ▁the ▁simplest ▁synth esis ▁methods ▁for ▁fur ans ▁is ▁the ▁reaction ▁of ▁ 1 , 4 - d ik et ones ▁with ▁ph osph orus ▁pent ox ide ▁( P 2 O 5 ) ▁in ▁the ▁Pa al – K nor r ▁synth esis . ▁The ▁th i oph ene ▁formation ▁reaction ▁of ▁ 1 , 4 - d ik et ones ▁with ▁Law ess on ' s ▁re agent ▁also ▁forms ▁fur ans ▁as ▁side ▁products . ▁Many ▁routes ▁exist ▁for ▁the ▁synth esis ▁of ▁subst it uted ▁fur ans . ▁ ▁Chem istry ▁Fur