反应详情

A solution of deca-1,4-diyne in THF was prepared following the method indicated in Example 1 and then an equivalent of ethylmagnesium bromide was added thereto at 0°. The mixture was kept at 60° for 45 min. After having added 1,2 equivalent of paraformaldehyde, the mixture was brought to reflux for 3 h. Once cooled, it was extracted with petroleum ether 80:100° and the organic phases were washed with water, then with an aqueous solution saturated with NaCl, dried and evaporated. The obtained residue was chromatographed on a column filled with silica, using as eluting agent a mixture of 1 to 10% of ethyl acetate in cyclohexane. Undeca-2,5-diyn-1-ol was thus obtained in 40% yield.

1. customat 0°
2. temperatureto reflux for 3 h
3. temperatureOnce cooled
4. extractionit was extracted with petroleum ether 80
5. wash100° and the organic phases were washed with water
6. dry with materialwith an aqueous solution saturated with NaCl, dried
7. customevaporated
8. customThe obtained residue was chromatographed on a column
9. additionfilled with silica
10. washas eluting agent
11. additiona mixture of 1 to 10% of ethyl acetate in cyclohexane