each isomer. Thus we have described a unique technique using peroxidase compound I for measuring rates and equilibria of keto-enoltautomerism which could readily be applied to a study of the influence of acid-base catalysts upon the rates. M-' s-l with a correction for hydrate formation.6
表 I. 对于 2-甲基丙醛 K,,,, 是 1.7 X 和 kl 8.6 X 这些结果与通过其他实验和理论方法获得的结果相比2 丙醛和丁醛在其烯醇形式中都具有顺反异构体。我们的结果可以与突发阶段的单个指数曲线拟合,其后是线性零阶阶段。爆发结果表明两种几何异构体与化合物 I 的反应性没有可检测到的差异,这可能是因为已知化合物 I 反应缺乏选择性,或者一种异构体占主导地位。爆发后观察到的线性行为可能是两个零级反应的总和,每个异构体一个。因此,我们描述了一种使用过氧化物酶化合物 I 测量酮-烯醇互变异构的速率和平衡的独特技术,该技术可以很容易地应用于酸碱催化剂对速率影响的研究。M-' sl 修正了水合物的形成。 6
Transient Palladadiphosphanylcarbenes: Singlet Carbenes with an “Inverse” Electronic Configuration (p<sub>π</sub><sup>2</sup> instead of σ<sup>2</sup>) and Unusual Transannular Metal−Carbene Interactions (π<sub>C</sub><sub>→</sub><sub>Pd</sub> Donation and σ<sub>Pd</sub><sub>→</sub><sub>C</sub> Back-donation)
作者:Joan Vignolle、Heinz Gornitzka、Laurent Maron、Wolfgang W. Schoeller、Didier Bourissou、Guy Bertrand
DOI:10.1021/ja066738j
日期:2007.1.1
Upon treatment with [PdCl(allyl)]2, asymmetrically substituted α,α‘-diphosphanyl diazo compounds eliminate dinitrogen to afford C-chlorodiphosphanylmethanide complexes in high yields. In the presence of a chloride-abstracting agent, such as sodium tetraphenylborate, the C-chlorodiphosphanylmethanide complexes react with pyridine and trimethylphosphine, readily affording the corresponding nitrogen and