State of palladium in ligandless catalytic systems for the Heck reaction of nonactivated bromobenzene

Schmidt, Alexander F.; Al-Halaiqa, A.; Смирнов, В. В.; Kurokhtina, A. A.

doi:10.1134/s0023158408050078

Cited by 23 publications

(16 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results of the UV monitoring of the real catalytic Suzuki-Miyaura reaction indicate that a considerable part of the palladium is in the form of [PdX 4 ] 2halo acid complexes (catalyst resting state) and is unin volved in the main catalytic cycle. This is also typical of the Mizoroki-Heck reaction conducted under ligand free conditions [27,28].…”

Section: (Iv)mentioning

confidence: 54%

Role of the base and endogenous anions in “ligand-free” catalytic systems for the Suzuki–Miyaura reaction

et al. 2016

Self Cite

View full text Add to dashboard Cite

UV spectroscopic studies combined with kinetic measurements for the Suzuki-Miyaura reaction catalyzed by "ligand free" catalytic systems have demonstrated that the base is involved in the formation of the palladium complexes ensuring the occurrence of the transmetalation stage. It follows from UV monitor ing data for the catalytic reaction involving aryl iodides that a considerable part of palladium during the pro cess is in the form of Pd 2+ acid complexes with endogenous anions and does not participate in the main cat alytic cycle.

show abstract

Section: (Iv)mentioning

confidence: 54%

Role of the base and endogenous anions in “ligand-free” catalytic systems for the Suzuki–Miyaura reaction

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…[25,[28][29][30][31][32] The crucial role of anionic Pd intermediates has been postulated in the Heck cycle. [6,32] The complex [PdBr 4 ] 2À has been suggested as an intermediate in the formation of colloidal palladium, [22,33] and the Pd species [PdX 3 ] À (X = Br, I) have been detected in Heck reaction mixtures. Reduction of these Pd II halide species (with concurrent halide loss) (re)generates the active Pd 0 species.…”

Section: Nmr Investigations During the Catalytic Reactionmentioning

confidence: 99%

Acceleration of the Rate of the Heck Reaction through UV‐ and Visible‐Light‐Induced Palladium(II) Reduction

2010

View full text Add to dashboard Cite

show abstract

“…. 41 Using the same approach to the Suzuki reaction the characteristic absorption of [PdBr 4 ] 2-(335-340 nm) in spectra of reaction solution was not observed. However, the absorption was found in the area of 360 nm, and its intensity passed through the maximum in the course of reaction ( Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Suzuki reaction: mechanistic multiplicity versus exclusive homogeneous or exclusive heterogeneous catalysis

Kurokhtina¹,

Schmidt²

2009

Arkivoc

View full text Add to dashboard Cite

Comparative studies of the kinetics and selectivity of the Suzuki and Heck reactions, the modified tests on homogeneity-heterogeneity and an implementation of the solid-phase variant of the Suzuki reaction indicate a substantial contribution of the heterogeneous mechanism to the Suzuki reaction catalysis which is in contrast to the Heck reaction. The contributions of molecular complexes, colloidal Pd and the larger-sized particles to Suzuki catalysis depend on the nature of the catalyst precursor, the solvent and the temperature of the reaction. It has been established that these contributions change significantly during the reaction as well.

show abstract

State of palladium in ligandless catalytic systems for the Heck reaction of nonactivated bromobenzene

Cited by 23 publications

References 34 publications

Role of the base and endogenous anions in “ligand-free” catalytic systems for the Suzuki–Miyaura reaction

Role of the base and endogenous anions in “ligand-free” catalytic systems for the Suzuki–Miyaura reaction

Acceleration of the Rate of the Heck Reaction through UV‐ and Visible‐Light‐Induced Palladium(II) Reduction

Suzuki reaction: mechanistic multiplicity versus exclusive homogeneous or exclusive heterogeneous catalysis

Contact Info

Product

Resources

About