Ž . Several manganese III porphyrins showed significantly increased turnover-numbers for the catalytic epoxidation of Ž . styrene upon addition of bulky Lewis acids such as ZnTPP and MgTPP TPPs tetraphenylporphyrin . Catalytic enhancement of twoto four-fold, depending on the additive, was observed with a manganese porphyrin bearing bis-pyridyl groups. The enhancement is primarily attributed to ...

The performance of trans axially substituted mono-(2 a) and bis(tert-butylisocyanide) (2 b) complexes derived from the highly active bio-inspired iron(II) (pre- )catalyst 2 containing an equatorial macrocyclic tetra N-heterocyclic carbene in homogenous olefin epoxidation catalysis is reported. H2O2 used as oxidant combination with Lewis acid Sc(OTf)3 additive resulting a considerable improvemen...

With the consumption of fossil fuels, level CO2 in atmosphere is growing rapidly, which leads to global warming. Hence, chemical conversion into high value-added products one most important approaches reducing emissions. Due being simple, inexpensive and environmentally friendly, direct synthesis cyclic carbonates from olefins a promising project for industrial application. In this review, we d...

The generation of multifunctional isolated active sites in zeolite supports is an attractive method for integrating multistep sequential reactions into a single-pass tandem catalytic reaction. In this study, bifunctional TiSn-Beta was prepared by simple and scalable post-synthesis approach, it utilized as efficient heterogeneous catalyst the conversion alkenes to 1,2-diols. Ti Sn Lewis acid wit...

The importance of chiral epoxides as synthetic building blocks in asymmetric synthesis is extremely difficult to overstate. While the highly enantioselective Sharpless, and JacobsenKatsuki, protocols for the epoxidation of internal alkenes are nowmature technologies of inestimable value, the conversion of terminal alkenes to enantioenriched 1-oxiranes has proven a considerably more difficult pr...

doi: 10.1111/j.1399-3054.2005.00538.x The light-induced de-epoxidation of xanthophylls is an important photoprotective mechanism in plants and algae. Exposure to ultraviolet radiation (UVR, 280–400 nm) can change the extent of xanthophyll de-epoxidation, but different types of responses have been reported. The de-epoxidation of violaxanthin (V) to zeaxanthin (Z), via the intermediate antheraxan...

A series of Mo-containing MFI zeolites with different Mo loadings (Mo-MFI-n, n represent the initial Si/Mo molar ratio) was hydrothermally synthesized by using tetrapropylammonium hydroxide as template and Mo-EDTA complex source. Various characterization results demonstrated that use is beneficial for incorporation more species into MFI-type zeolites. The special complexing capability EDTA2– pl...

We present a novel in situ reaction cell for heterogeneous catalysis monitored in situ by x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS). The reaction can be carried out at a total pressure up to 1 atm, a regime that has not been accessible to comparable in situ techniques and thus closes the pressure gap to many industrial standard conditions. Two alternate ...