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The betaine-ylide route to trans-alkenols

(E)-RCH:CH(CH2)nOH (n = 2,3,5,7; R = Et, pentyl, hexyl, E-CH:CHMe) were obtained in 69-78% yield in a 1-pot reaction by treating HO(CH2)nCH2P+Ph3 Br- with PhLi in tetrahydrofuran-EtiO, followed by addn. of RCHO, treatment with HCl-Et2O, and with KOCMe3. [on SciFinder (R)]

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