The Ru(0)-catalyzed straightforward synthesis of conjugated tetraenes has been achieved in up to 85% yield by coupling of 2 equiv of internal alkynes with 1,3-butadiene at room temperature. The stoichiometric reaction of [Ru(η⁴-cisoid-1,3-butadiene)(η⁴-1,5-COD)(NCMe)] with 2 equiv of 3-hexyne produces a tetraene complex of Ru(0), [Ru{3–6-η⁴-(3E,5E,7E,9E)-4,9-diethyldodeca-3,5,7,9-tetraene}(η⁴-1,5-COD)(NCMe)], in 98% yield, which releases the conjugated tetraene ligand in 92% yield by exposure to 1,3-butadiene.

中文翻译：

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Ru（0）催化共轭四烯的简单合成：使用两个内部炔烃与1,3-丁二烯的方法

通过在室温下将2个当量的内部炔烃与1,3-丁二烯偶联，可以以高达85％的产率实现Ru（0）催化的共轭四烯的直接合成。的化学计量反应的[Ru（η ⁴ - cisoid -1,3-丁二烯）（η ⁴ -1,5-二COD）（NCMe）]与2当量3-己炔的产生复杂的Ru（0）的四烯，[茹{3-6-η ⁴ - （3- ê，5 ë，7 ê，9 ë）-4,9- diethyldodeca -3,5,7,9-四烯}（η ⁴ -1,5-二COD）（ NCMe）]，产率为98％，通过与1,3-丁二烯接触，以92％的产率释放出共轭四烯配体。