State ▁ag encies ▁of ▁North ▁Carolina ▁Military ▁and ▁V eter ans <0x0A> </s> ▁Ph eny lac et yl ene ▁is ▁an ▁al ky ne ▁hydro car bon ▁containing ▁a ▁phen yl ▁group . ▁It ▁exists ▁as ▁a ▁color less , ▁vis c ous ▁liquid . ▁In ▁research , ▁it ▁is ▁sometimes ▁used ▁as ▁an ▁analog ▁for ▁ac et yl ene ; ▁being ▁a ▁liquid , ▁it ▁is ▁easier ▁to ▁handle ▁than ▁ac et yl ene ▁gas . ▁ ▁Pre par ation ▁In ▁the ▁labor atory , ▁ph eny lac et yl ene ▁can ▁be ▁prepared ▁by ▁elim ination ▁of ▁hydro gen ▁b rom ide ▁from ▁sty rene ▁di b rom ide ▁using ▁sod ium ▁am ide ▁in ▁am mon ia : ▁ ▁It ▁can ▁also ▁be ▁prepared ▁by ▁the ▁elim ination ▁of ▁hydro gen ▁b rom ide ▁from ▁b rom ost y rene ▁using ▁mol ten ▁pot ass ium ▁hydro x ide . ▁ ▁Re actions ▁ ▁Ph eny lac et yl ene ▁can ▁be ▁reduced ▁( h ydro gen ated ) ▁by ▁hydro gen ▁over ▁Lind lar ▁catal yst ▁to ▁give ▁sty rene . ▁ ▁It ▁under go es ▁a ▁metal ▁catal yz ed ▁tr imer ization ▁to ▁give ▁ 1 , 2 , 4 - ▁( 9 7 %) ▁and ▁ 1 , 3 , 5 - tri phen yl ben z ene : ▁▁ ▁Cho osing ▁a ▁rh od ium ▁catal yst ▁leads ▁to ▁the ▁cycl otr imer ization ▁producing ▁both ▁the ▁ 1 , 2 , 4 - ▁and