Preparation of Alkenes:Elimination Reactions Elimination reaction X-Y B-elimination or 1.2-elimination A.Dehydration of alcohols H OH H20 Keg<1 higher b.p. lower b.p (distill alkene to drive rxn -> H2S04, reversible ease of dehydration: H3PO4 3°>2°>1°College Preparation of Alkenes: Elimination Reactionsof Science C X C Y C C + X Y Elimination reaction β-elimination or 1,2-elimination A. Dehydration of alcohols C H C OH C C + H 2 O H + Keq < 1 higher b.p. lower b.p (distill alkene to drive rxn → ) OH H 2SO 4 ∆ OH H 3PO 4 ∆ - r e v e r s i b l e - ease of dehydration: 3 ° > 2º > 1º