One-step synthesis of a 9-phosphabarbaralane. Close approach to a bishomoaromatic system in the solid state.
One-step synthesis of a 9-phosphabarbaralane. Close approach to a bishomoaromatic system in the solid state.
复制标题
9-Phosphabarbaralane 的一步合成。
DOI：
10.1021/ja00263a041
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发表时间：
1986
影响因子：
15
通讯作者：
A. Cowley
中科院分区：
文献类型：
--
作者：
S. Weissman;S. Baxter;A. Arif;A. Cowley
理论预测，5 尤其是 Hoffmann 等人的预测。 5a 和杜瓦等人。 5b_d 激发了通过取代 semibullvalene6 和 barbaralane 来实现以 V 为例的双芳香族系统的尝试。 7 通过 X 射线晶体学，已确定许多取代的半牛烯具有异常长的 C2-C8 键和短的 C4-C6 距离。 8 这些几何异常被描述为“与接近 Cope 重排过渡态的结构一致”，6p 然而，唯一可用于比较的 barbaralane 几何结构对应于 C (2)-C (8) 和 C (4)-C (6) 距离分别为 1.585 和 2.370 A 的局部结构。 78 因此，令人惊讶的是，l9 的 X 射线衍射研究（图 2 和表 I）表明，
Theoretical predictions, 5 notably by Hoffmann et al. 5a and Dewar et al. 5b_d have inspired attempts to achieve a bishomo-aromatic system as exemplified by V through substitution of semibullvalene6 and barbaralane. 7 By means of X-ray crystallography it has been determined that a number of substituted semibullvaienes possess unusually long C2-C8bonds and shortC4-C6 distances. 8 These geometric anomalies have been described as “consistent with a structure that is approaching the transition state for Cope rearrangement", 6p The only barbaralane geometry available for comparison, however, corresponds to a localized structure with C (2)-C (8) and C (4)-C (6) distances of 1.585 and 2.370 A, respectively. 78 It was therefore surprising that the X-ray diffraction study of l9 (Figure 2 and Table I) revealed that the