Hierarchical Ti-Beta with a three-dimensional ordered mesoporosity for catalytic epoxidation of bulky cyclic olefins

The construction of hierarchical titanosilicate beta zeolites with desirably interconnected meso-/microporosity, controllable morphology and enhanced activity of catalytic oxidation is a pervasive challenge in zeolite community. We report here in...

Synthesis of novel fluorinated building blocks via halofluorination and related reactions

A study exploring halofluorination and fluoroselenation of some cyclic olefins, such as diesters, imides, and lactams with varied functionalization patterns and different structural architectures is described. The synthetic methodologies were based on electrophilic activation through halonium ions of the ring olefin bonds, followed by nucleophilic fluorination with Deoxo-Fluor®. The fluorine-containing products thus obtained were subjected to elimination reactions, yielding various fluorine-containing small-molecular entities.

A Highly Efficient Heterogeneous Catalyst of Bimetal-Organic Frameworks for the Epoxidation of Olefin with H2O2

A series of bimetel organic framework MnxCu1−x-MOF were prepared. The MOFs was characterized and analyzed by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The catalytic activity of the developed catalyst was tested on various olefins by H2O2 as oxidant. The MOFs catalyst exhibits excellent catalytic activity for the epoxidations of various aromatic and cyclic olefins. Particularly, Mn0.1Cu0.9-MOF can achieve 90.2% conversion of styrene with 94.3% selectivity of styrene oxide at 0 °C after reaction 6 h. The MOF exhibited the catalytic activity of inverse temperature effect on epoxidation of styrene. The introduction of copper component can stabilize H2O2 and inhibit its decomposition to a certain extent. The catalyst can be reused at least five cycles without significant loss in activity towards epoxidation.

cis-Specific ring opening metathesis polymerisation (ROMP) of cyclic olefins using (pentafluorophenylimido)vanadium(v)-alkylidene, V(CHSiMe3)(NC6F5)[OC(CF3)3](PMe3)2

Highly cis-specific (Z selective) ring opening metathesis polymerisation of cycloheptene has been demonstrated using V(CHSiMe3)(NC6F5)[OC(CF3)3](PMe3)2.

Bolaform surfactant-directed synthesis of TS-1 zeolite nanosheets for catalytic epoxidation of bulky cyclic olefins

Hierarchical TS-1 nanosheets were hydrothermally synthesized by using a bolaform surfactant as the structure-directing agent and exhibited improved catalytic performance and superior recyclability in the epoxidation of cyclohexene and cyclooctene.

One-pot oxidative cleavage of cyclic olefins for the green synthesis of dicarboxylic acids in Pickering emulsions in the presence of acid phosphate additives

Dicarboxylic acids were prepared by the oxidative cleavage of cyclic alkenes by adsorbing dodecyltrimethylammonium phosphotungstate particles and silica particles functionalized with octadecyl chains and sulfonic acid groups at the W/O interface.