OM RX R R R R RX anti: syn n'C4Hg M 88:12 CH2=CH Mel 75:25 CH3 CH2=CHCH2 Br 89:11OM R' R''X O R'' R' O R'' R' R' R''X anti:syn n - C4 H9 MeI CH2 =CH- MeI CH3 CH2 =CHCH2 Br 88:12 75:25 89:11