Piotr Pawluć

Bio: Piotr Pawluć is an academic researcher from Adam Mickiewicz University in Poznań. The author has contributed to research in topics: Silylation & Hydrosilylation. The author has an hindex of 19, co-authored 83 publications receiving 949 citations. Previous affiliations of Piotr Pawluć include Wrocław University of Economics & university of lille.

Markovnikov Hydrosilylation of Alkenes: How an Oddity Becomes the Goal

Abstract: Over the years, hydrosilylation of terminal alkenes has emerged as one of the most prominent applications of homogeneous catalysis. While most of the relevant reports concern β-selective hydrosilylation, yielding linear products which are of industrial importance, the opposite selectivity is also gaining increasing interest and sets the scene for the next challenges. Markovnikov hydrosilylation of alkenes, especially in its asymmetric variant, has become the aim of development of new catalytic systems successfully implementing base-metal complexes—one of the most prominent trends in contemporary catalysis. In this Perspective, we present the current state of this topic and the way it has been achieved, with special emphasis put on the issues still unresolved and prospective directions of development based on the trends present in the literature, but without unnecessary attention to some details of only historical significance.

Graphene oxide-branched polyethylenimine foams for efficient removal of toxic cations from water

Abstract: Highly porous foams based on graphene oxide functionalized with polyethylenimine are generated and used with unprecedented efficiency for adsorbing heavy metal ions. A multiscale analysis of the GO–BPEI nanocomposite provided evidence for the covalent grafting of BPEI on GO and the formation of low crystalline porous foams. The uptake experiments revealed that the GO–BPEI's adsorption of toxic cations is strongly dependent on the pH in range from 2 to 10, as a result of the different interactions at the supramolecular level between the metal ions and the GO–BPEI foam. The maximum uptake capacities for Cu(II), Cd(II) and Pb(II) are achieved at pH = 5 and exhibit values as high as 1096, 2051 and 3390 mg g−1, respectively, being ca. over 20 times greater than standard sorbents like activated carbon. The GO–BPEI composite can be easily regenerated as proven by performing adsorption cycles. Also, the thermodynamic parameters including standard Gibbs free energy (ΔGo), the enthalpy change (ΔHo) and entropy change (ΔSo) revealed the exothermic and spontaneous nature of the adsorption process.

Ruthenium-catalysed hydrosilylation of carbon–carbon multiple bonds

Abstract: Ruthenium-based complexes are generally considered to be efficient catalysts due to their high activity and electron transfer features. Although there are a limited number of highly selective olefin hydrosilylation protocols with ruthenium catalysts, recently a wide variety of the ruthenium complexes has been reported as unique catalyst precursors for the regiocontrolled hydrosilylation of alkynes. The ruthenium-catalysed hydrosilylation of alkynes represents one of the most efficient and straightforward methods for the synthesis of stereodefined vinylsilanes, which are particularly attractive scaffolds for further transformations including palladium-catalysed cross-coupling with organic halides or desilylative oxidation. The article highlights recent developments and covers the literature from the last two decades with respect to the ruthenium-catalysed hydrosilylation of alkenes and alkynes with particular emphasis on its application in organic synthesis.

Graphene Oxide Hybrid with Sulfur–Nitrogen Polymer for High-Performance Pseudocapacitors

Abstract: Toward the introduction of fast faradaic pseudocapacitive behavior and the increase of the specific capacitance of carbon-based electrodes, we covalently functionalized graphene oxide with a redox active thiourea-formaldehyde polymer, yielding a multifunctional hybrid system. The multiscale physical and chemical characterization of the novel 3-dimensional hybrid revealed high material porosity with high specific surface area (402 m2 g–1) and homogeneous element distribution. The presence of multiple functional groups comprising sulfur, nitrogen, and oxygen provide additional contribution of Faradaic redox reaction in supercapacity performance, leading to a high effective electrochemical pseudocapacitance. Significantly, our graphene-based 3-dimensional thiourea-formaldehyde hybrid exhibited specific capacitance as high as 400 F g–1, areal capacitance of 160 mF cm–2, and an energy density of 11.1 mWh cm–3 at scan rate of 1 mV s–1 with great capacitance retention (100%) after 5000 cycles at scan rate of 100...

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Use of Bromine and Bromo-Organic Compounds in Organic Synthesis

Abstract: Bromination is one of the most important transformations in organic synthesis and can be carried out using bromine and many other bromo compounds. Use of molecular bromine in organic synthesis is well-known. However, due to the hazardous nature of bromine, enormous growth has been witnessed in the past several decades for the development of solid bromine carriers. This review outlines the use of bromine and different bromo-organic compounds in organic synthesis. The applications of bromine, a total of 107 bromo-organic compounds, 11 other brominating agents, and a few natural bromine sources were incorporated. The scope of these reagents for various organic transformations such as bromination, cohalogenation, oxidation, cyclization, ring-opening reactions, substitution, rearrangement, hydrolysis, catalysis, etc. has been described briefly to highlight important aspects of the bromo-organic compounds in organic synthesis.

Palladium-catalysed cross-coupling of organosilicon reagents

Abstract: The palladium catalysed cross-coupling of organosilicon reagents with organo halides and pseudo-halides has developed over the past 30 years into an efficient and attractive carbon–carbon bond forming strategy. Extensive research within this field to expand and diversify on the scope of the organosilicon coupling reaction will continue to promote its use in the synthesis of biologically and pharmaceutically important organic molecules. The recent advances made within this area are explored in this critical review (199 references).