Olefin Metathesis,
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‐Cresol, and the Second Generation Grubbs Catalyst: Fitting the Pieces
作者:Marthinus R. Swart、Linette Twigge、Elizabeth Erasmus、Charlene Marais、Barend C. B. Bezuidenhoudt
DOI:10.1002/ejic.202100078
日期:2021.5.14
generation catalyst (GII) allows the cross‐metathesis of acrylates with prop‐1‐en‐1‐ylbenzenes underconditions that only give the prop‐1‐en‐1‐ylbenzene self‐metathesis product in the absence of cresol. NMR and IR spectroscopy, MALDI‐TOF MS and XPS supported the formation of a ruthenium benzylidene with hydrogen bonds between p‐cresol and the chloride ligands of GII. XPS furthermore confirmed p‐cresol
对苯甲酚作为Grubbs第二代催化剂(GII)的添加剂,可以在只有丙-1-烯-1-基苯自我复分解产物的条件下,将丙烯酸与丙-1-烯-1-基苯进行交叉复分解在没有甲酚的情况下。NMR和IR光谱学,MALDI-TOF MS和XPS支持了在对甲酚和GII的氯化物配体之间具有氢键的钌亚苄基的形成。XPS还证实了对甲酚会增加GII Ru 3d 5/2,3d 3 / 2,3p 3/2和3p 1/2光电子线的结合能,而11 H NMR光谱表明卡宾碳和氢被保护。因此推测,对甲酚可以通过减少金属中心的电子密度和增加卡宾的电子密度,使缺电子化合物与钌亚苄基之间的相互作用更加轻松。
Iodination of Thallium(I) Salts of Phenols
作者:Richard C. Cambie、David S. Larsen、Peter S. Rutledge、Paul D. Woodgate
DOI:10.1071/c97051
日期:——
The iodination of thallium(I) salts of phenols is examined and the results are
compared with those of the selective ortho-iodinating
reagent thallium(I) acetate-iodine.
p-Cresol derivatives of the Grubbs 2nd generation catalyst were prepared with either hydrogen bonds between p-cresol and the Cl-ligands or ligand exchange between the Grubbs 2nd generation catalyst and thallium p-cresolate to form Ru-O coordination bonds and TlCl. ATR FTIR and UV-Vis spectroscopic studies revealed a blue shift in certain bands, indicating that coordination occurred. X-ray Photoelectron Spectroscopy was recorded for each of the three Ru-complexes. The binding energy of the Ru 3d(5/2), Ru 3p(3/2) photoelectron line (found at ca. 281 and 462 eV, respectively) of the different complexes showed the influence of the inductive electronic effects of the p-cresol interaction with the complexes. The Cl 2p photoelectron lines indicated ionic and covalent environments, representing the TlCl and the Ru-Cl bonds, respectively. The atomic ratio between Ru:P:Cl:N:Tl confirmed the binding modes of p-cresol to the Grubbs 2nd generation catalyst.
MIXAJLOV, I. E.;MINKIN, V. I.;DUSHENKO, G. A.;KAMENETSKAYA, I. A.;OLEXNOV+, DOKL. AN CCCP, 299,(1988) N 6, 1399-1402
作者:MIXAJLOV, I. E.、MINKIN, V. I.、DUSHENKO, G. A.、KAMENETSKAYA, I. A.、OLEXNOV+