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Dehydrobromination of threo-MeCHBrCHBrCH2OH gave (E)-2- and (E)-3-bromo-2-buten-1-ol, which with EtMeCHLi gave, resp., (E)-MeCH:CLiCH2OLi and (E)-MeCLi:CHCH2OLi; these with MeI or ethylene oxide gave (Z)-MeCH:CMeCH2OH, Me2C:CHCH2OH, and (E)-HOCH2CH2CMe:CHCH2OH. [on SciFinder (R)]