论文部分内容阅读
环辛四烯为一不平面分子,一般相信,理论中的平面环辛四烯需要将一对不成对电子填入两个简并不成键轨道,因而引起之伪扬-泰勒效应,可使带 D_(8h)对称性之平面环辛四烯非平面化而成“船”形的结构。本文简单介绍加减电子法、带张力环稠合法、键长缩短法和金属螫合法四种可使不平面之环辛四烯成为平面方法。然而,随有机合成方法之不断进展,在将来可能出现更多改变环辛四烯不平面结构的方法。我们在此文章提出化合物98即为一个可使环辛四烯成为平面的例子。98之合成将成为有机合成化学家的一个新的挑战。
Cyclooctylene is a nonplanar molecule. It is generally believed that the plane cyclooctatetraene in theory requires a pair of unpaired electrons to fill in two degenerate non-bonding orbitals, thus causing pseudo-Young-Taylor effect, D_ (8h) symmetry plane cyclooctatetraene non-planar and form a “boat” -shaped structure. This article briefly introduces the addition and subtraction electron method, with tension ring fusion method, the key length shortening method and the metal 螫 law four can make the non-planar ring Xinte ene into a planar method. However, with the progress of the organic synthesis method, more methods for changing the non-planar structure of cyclooctatetranes may appear in the future. We propose in this paper that Compound 98 is an example of planarizing cyclooctatetraene. The synthesis of 98 will be a new challenge for organic synthesis chemists.