Improved Sonogashira CC coupling through clay supported palladium complexes with tridentate pincer bis-carbene ligands

Novel phosphite palladium complexes and their application in C–P cross-coupling reactions

“…It is worth pointing out that other small size phosphite ligands, such as triphenylphosphite, do not yield ortho-metallated complexes under the same reaction conditions [4d,14]. 13 C NMR analysis showed a signal at d 150.1 ppm, which is very typical for the C ipso of CePd s-bonds in ortho-metallated complexes [4,5,14].…”

“…This method provides an entry to arylphosphonates, arylphosphinates and arylphosphine oxides [10]. To the best of our knowledge, pincer complexes have not been studied in CeP cross-coupling reactions for the preparation of tertiary phosphine-boranes, though, their remarkable catalytic performances in Heck [11], Suzuki [12] and Sonogashira [13] reactions have been carefully studied and are well documented.…”

Mono‐, Bi‐ and Tridentate N‐Heterocyclic Carbene Ligands for the Preparation of Transition‐Metal‐Based Homogeneous Catalysts

“…Scheme 42. Similar heterogenized catalytic systems were tested in the Sonogashira coupling of aryl halides with phenylacetylene (Scheme 41). [94] The activities of the immobilized systems are higher than that of previously reported Pd-carbene catalysts [95] or Pd-immobilized catalytic systems [96] for the coupling of the same substrates.…”

Donor‐Functionalised N‐Heterocyclic Carbene Complexes of Group 9 and 10 Metals in Catalysis: Trends and Directions

“…[75][76][77] Peris and Claver et al have immobilized the rigid pincer complexes, type 27 ( Figure 4), in clays (montmorillonite and bentonite), and tested the resulting systems in the Heck olefination of aryl halides and Sonogashira coupling of aryl halides with terminal alkynes. [76,77] In the first example, Peris and Claver et al, employed the catalyst system to couple phenyl iodide and styrene at temperatures of 180°C and recycled the system up to 10 times with little loss in activity. [76] Aryl bromides could also be coupled with good yields.…”