Alkene hydrosilylation is amongst the largest industrial homogenous catalysis processes. Cobalt offers a sustainable alternative to commonly used platinum catalysts achieve this transformation. Using two bisiminopyridine cobalt(II) regiodivergent of alkenes has been developed. Variation pre-catalyst activator and ligand substituents were investigated enable controlled, both aryl- alkyl-substitu...

In this issue of Chem Catalysis, Wang et al. report the synthesis 1,1-cyclopropanediesters promoted by a D2-symmetric chiral amidoporphyrin catalyst. The carbene transfer from unsymmetrical diazomalonates to large scope challenging alkenes occurred with high stereocontrol thanks efficiency Co(II)-based metalloradical catalytic system.

This work reports the isolation and spectroscopic characterization of pentavalent metal–imido species that are reactive towards N-group transfer reactions including alkene aziridination C–H amination.

Functionality preferences of metathesis Ru carbenes to various alkenes and alkynes with electronic and steric diversity were determined by using time-dependent fluorescence quenching. The functionality preferences depend not only on the properties of multiple bonds but also on the ligands on Ru. There was a good correlation between functionality preference and the metathesis reaction outcome. T...

We describe a novel two-step method, starting from bulk silicon wafers, to construct DNA conjugated silicon nanoparticles (SiNPs). This method first utilizes reactive high-energy ball milling (RHEBM) to obtain alkene grafted SiNPs. The alkene moieties are subsequently reacted with commercially available thiol-functionalized DNA via thiol-ene click chemistry to produce SiNP DNA conjugates wherei...

The effects of starting material substitution patterns on reaction selectivity for the gold(I)-catalysed cycloisomerisations of aryl substituted 1,7-enynes were investigated. The results indicated the chemoselectivity of the reaction to be highly substrate and catalyst dependent. Either the piperidine or the tetrahydro-1H-azepine product was obtained in moderate to excellent yields depending on...

The cationic ruthenium-hydride complex, formed in-situ from the treatment of the tetranuclear ruthenium-hydride complex {[(PCy(3))(CO)RuH](4)(mu(4)-O)(mu(3)-OH)(mu(2)-OH)} with HBF(4).OEt(2), was found to be a highly effective catalyst for the intermolecular coupling reaction of arylketones and 1-alkenes to give the substituted indene and ortho-C-H insertion products. The formation of the inden...

Since the molybdenum and ruthenium carbene complexes 1a and 1b were discovered by Schrock and Grubbs in 1990 and 1992, synthetic organic chemistry has progressed with the use of these complexes as the catalyst for olefin metathesis. It was found that the ruthenium carbene complex was also effective for enyne metathesis, which occurs between an alkene and an alkyne. Intramolecular enyne metathes...