The article gives a brief outline of the rediscovery of tetrahydronaphthalene-1,4-dione, a stable tautomer which has been known for over half a century but has not been applied in synthesis. Desymmetrization is readily achieved via enantioselective reduction. Synthetic potential
apart, the dione and its chromiumtricarbonyl complex are of theoretical interest. Thus, whereas dihydroxynaphthalene requires quite harsh conditions and leads to a 1:1 mixture of the two tautomers, the chromiumtricarbonyl complex of dihydroxynaphthalene tautomerizes under very mild conditions
to the tetrahydronaphthalene-1,4-dione complex. An earlier literature report showed that in trifluoroacetic acid, the dione tautomer is present exclusively. This has now been used to isolate multigram quantities of the compound.
这篇文章简要介绍了四氢萘-1,4-二酮的重新发现,这是一种稳定的互变异构体,已知已有半个世纪,但尚未应用于合成。通过对映选择性还原,可以轻松实现非对称化。除了合成潜力外,这种二酮及其铬三羰基配合物也具有理论兴趣。因此,虽然二氢萘酚需要相当严酷的条件,并导致两种互变异构体的1:1混合物,但二氢萘酚的铬三羰基配合物在非常温和的条件下发生互变异构,形成四氢萘-1,4-二酮配合物。早期的文献报告表明,在三氟乙酸中,只存在二酮互变异构体。现在已经利用这一点来分离多克量的化合物。