First Detection of a Ruthenium-Carbene-Resorc[4]arene Complex During the Progress of a Metathesis Reaction
For the first time we describe the detection of a ruthenium-carbene-resorc[4]arene complex produced, as a key intermediate, during an olefin metathesis reaction carried out on a resorc[4]arene bicyclic olefin with [Ru(=CHPh)Cl2(PCy3)2] Grubbs first-generation (G1ST) catalyst. The complex was identified by using high-resolution (600 MHz) 1H, 31P NMR and DOSY spectroscopy, in a non-invasive fashion. The singlet at ? = 19.98 ppm (1H NMR), attributed to the alkylidene proton in the G1ST catalyst and that at ?