Decomplexation of Cyclopentadienylmanganese Tricarbonyls under Very Mild Conditions: A Novel Route to Substituted Cyclopentadienes and Their Application in Organometallic Synthesis
作者:Siden Top、El Bachir Kaloun、Stéphanie Toppi、Audrey Herrbach、Michael J. McGlinchey、Gérard Jaouen
DOI:10.1021/om010274a
日期:2001.10.1
attempted decomplexation using Ce(IV) or Fe(III) leads merely to decomposition products. It is proposed that, upon photolytic loss of a CO ligand, coordination of methanol or water facilitates an intramolecular proton transfer to the cyclopentadienyl ring. This method is applicable to polyfunctional molecules such as ethynylestradiol. In this new synthetic approach, these cymantrenes have also been
Reaction of [Re(CO)6]+ cation with cyclopentadienylthallium derivatives. Formation of cyclopentadienylrheniumtricarbonyl derivatives via [Re(CO)3L3]+ (L=solvent)
作者:Stéphane Masi、Siden Top、Gérard Jaouen
DOI:10.1016/s0020-1693(03)00110-5
日期:2003.7
The reaction of [Re(CO)(6)](+) with cyclopentadienylthallium derivatives in DMSO or in DMF affords the corresponding cyclopentadienyltricarbonylrhenium derivatives with high yields. The cyclopentadienyl transfer from CpTl to [Re(CO)(6)][BF4] was also carried out in acetonitrile. However, in this case it is necessary to work in a sealed tube heated at 160 degreesC. Two compounds are obtained: the expected CpRe(CO)(3) and a rhenium salt which was identified as [Re(CO)(3)(CH3CN)(3)][BF4]. The triacetonitrile tricarbonyl cation fac-[Re(CO)(3)(CH3CN)(3)](+) is also formed upon dissolution of [Re(CO)(6)][BF4] in acetonitrile and heating at 160 degreesC under pressure. It reacts afterwards with CpTl in acetonitrile to yield CpRe(CO)(3) (32%). Thus, [Re(CO)(3)(CH3CN)(3)][BF4] can be considered as an intermediate for this ligand-transfer reaction. (C) 2003 Elsevier Science B.V. All rights reserved.