▁yellow - or ange ▁solid , ▁also ▁described ▁by ▁Mond . ▁ ▁When ▁he ated , ▁Fe ( CO ) 5 ▁converts ▁to ▁small ▁amounts ▁of ▁the ▁metal ▁cluster ▁Fe 3 ( CO ) 1 2 , ▁a ▁green ▁solid . ▁Simple ▁therm ol ysis , ▁however , ▁is ▁not ▁a ▁useful ▁synth esis , ▁and ▁each ▁iron ▁car b ony l ▁complex ▁exhib its ▁distinct ▁react ivity . ▁ ▁Indust rial ▁production ▁and ▁use ▁The ▁industrial ▁production ▁of ▁this ▁comp ound ▁is ▁somewhat ▁similar ▁to ▁the ▁Mond ▁process ▁in ▁that ▁the ▁metal ▁is ▁treated ▁with ▁carbon ▁mon ox ide ▁to ▁give ▁a ▁vol atile ▁gas . ▁In ▁the ▁case ▁of ▁iron ▁pent ac ar b ony l , ▁the ▁reaction ▁is ▁more ▁sl ugg ish . ▁It ▁is ▁necessary ▁to ▁use ▁iron ▁sp on ge ▁as ▁the ▁starting ▁material , ▁and ▁har sh er ▁reaction ▁conditions ▁of ▁ 5 – 3 0   MP a ▁of ▁carbon ▁mon ox ide ▁and ▁ 1 5 0 – 2 0 0   ° C . ▁Similar ▁to ▁the ▁Mond ▁process , ▁sul fur ▁acts ▁as ▁a ▁catal yst . ▁The ▁cru de ▁iron ▁pent ac ar b ony l ▁is ▁pur ified ▁by ▁dist ill ation . ▁U ll mann ' s ▁Encyclopedia ▁of ▁Indust rial ▁Chem istry ▁reports ▁that ▁there ▁are ▁only ▁three ▁plants ▁manufact uring ▁pent ac ar b ony l ir on ; ▁B AS F ▁in ▁Germany ▁and ▁G AF ▁in ▁Alabama ▁have ▁capac ities ▁of ▁ 9 0 0