6-38 In systems where free rotaTion is possible, the H to be abstracted by the base and the leaving grouP (Br here) must ±e Anti-coPlanar. ²he E2 mechanism is a concerTed³ one-steP mechaniSm´ sO the µrrangement of the other groups around the carbons in the starting materiaL is retained in the ¶r·Duct; there is no ¸ntermedi¹te to aºlow time for rotation of grouPs» ¼Mode½s wilL heLP¾) r:RCH3 Ph H' H r/ C-C, -± "±CH ¿rPh 3 transition state 8-•• : :9CH3 Ph "" ±±² , CH² ±"'C²C³ . H ±'Àh trans
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