Synthesis and Absolute Configuration of the 7-Phenylhepta-4,6-diyne-1,2-diol Isolated from Bidens pilosa

The configurations for the starting epoxides (R)-3 and (S)-3 were incorrectly drawn; the two structures should be exchanged­ with one another. The configurations for all intermediates and end products were correct, as further secured by the following optical rotations: for (R)-4: [α]_D ²³ –16.9 (c 1.0, CHCl₃) {Lit.^3a [α]_D ²⁵ –16.4 (c 1.035, CHCl₃)}; for (R)-5: [α]_D ²³ –12.4 (c 0.63, CHCl₃) {Lit.^3a [α]_D ²⁵ –12.1 (c 0.62, CHCl₃)}.

Synthesis 2011, 2131.