Carbon−Oxygen Bond Formation between a Terminal Alkoxo Ligand and a Coordinated Olefin. Evidence for Olefin Insertion into a Rhodium Alkoxide
作者:Pinjing Zhao、Christopher D. Incarvito、John F. Hartwig
DOI:10.1021/ja063347w
日期:2006.8.1
Preparation and reactivity of a series of bis(phosphine) rhodium(I) alkoxides stabilized by intramolecular olefin coordination are reported. Rh(PEt3)2[kappa1:eta2-OCRR'(CH2)nCH=CH2]} (n = 1, 2) were prepared via alcoholysis of Rh(PEt3)2[N(SiMe3)2]} by the corresponding alcohols HOCRR'(CH2)nCH=CH2. The in situ generated Rh(PEt3)2[kappa1:eta2-OCRR'(CH2)2CH=CH2]} were not stable at ambient temperatures
报道了一系列通过分子内烯烃配位稳定的双(膦)铑(I)醇盐的制备和反应性。Rh(PEt3)2[kappa1:eta2-OCRR'(CH2)nCH=CH2]} (n = 1, 2) 通过 Rh(PEt3)2[N(SiMe3)2]} 的醇解制备醇 HOCRR'(CH2)nCH=CH2。原位生成的 Rh(PEt3)2[kappa1:eta2-OCRR'(CH2)2CH=CH2]} 在环境温度下不稳定,在添加的 PEt3 存在下分解,得到 2,2-二取代-5-亚甲基四氢呋喃和 [(PEt3)4Rh-H] 的产率很高。动力学和氘标记结果支持通过将烯烃直接插入 Rh-O 键,然后快速消除 β-氢化物来实现合成氧化途径。相比之下,Rh(PEt3)2[kappa1:eta2-OCRR'CH2CH=CH2]}被分离为稳定的晶体,并且Rh-烯烃相互作用由X-射线结构证明。这些复合物的加热产生 [Rh(PEt3)2(eta2-allyl)]