▁NS C ▁ 8 9 2 6 4 . ▁ ▁Str ucture ▁and ▁react ivity ▁The ▁structure ▁of ▁ben zo [ c ] flu or ene ▁is ▁dep icted ▁in ▁the ▁inf obox ▁on ▁the ▁right . ▁It ▁is ▁an ▁a rom atic ▁flu or ene - der ived ▁mole c ule ▁with ▁an ▁extra ▁ben z ene ▁ring . ▁This ▁ben z ene ▁ring ▁is ▁attached ▁to ▁carbon ▁ 3 ▁and ▁ 4 ▁of ▁the ▁flu or ene - der ived ▁mole c ule . ▁ ▁The ▁ 3 D ▁structure ▁of ▁ben zo [ c ] flu or ene ▁is ▁dep icted ▁in ▁the ▁inf obox ▁on ▁the ▁right ▁as ▁well . ▁It ▁is ▁mostly ▁flat , ▁because ▁it ▁consists ▁of ▁ 3 ▁a rom atic ▁rings . ▁Only ▁the ▁ 2 ▁hydro gen ▁atoms ▁on ▁the ▁ 5 ▁ring ▁are ▁orient ed ▁into ▁the ▁ 3 D ▁plane . ▁ ▁Syn thesis ▁ ▁Ben zo [ c ] flu or ene ▁occurs ▁naturally ▁in ▁tar , ▁but ▁can ▁also ▁be ▁manually ▁synth es ized ▁in ▁a ▁four ▁step ▁process , ▁which ▁is ▁dep icted ▁in ▁the ▁picture ▁below . ▁The ▁starting ▁product ▁is ▁ 1 - ind an one ▁( 1 ). ▁This ▁is ▁b rom in ated ▁in ▁a ▁substitution ▁reaction ▁to ▁ 3 - b rom o ind an one ▁( 2 ) ▁using ▁the ▁re agent ▁N - b rom os u cc in im ide . ▁This ▁subst ance ▁is ▁de h ydro b rom in