The free radical dispersion polymerization of styrene (St) and methyl methacrylate (MMA) initiated by poly(oxyethylene) (PEO) macroazoinimer (MIM-400) in water/ethanol, was investigated at three different temperatures (50, 60 and 80 8C) for seven polymerization times (3, 6, 9, 12, 24, 36 and 48 h). PStPEO and PMMA-PEO networks were obtained. In each case, polymer gel fractions depend on the pol...

The ground-breaking advances in catalytic olefin metathesis by Grubbs and others have revolutionized many aspects of organic synthesis, ensuring a high general level of interest in the key metal alkylidene catalysts. The mechanism of ruthenium-mediated olefin metathesis catalysed by first (1a) and second generation (1b) Grubbs complexes has been extensively studied both by experiment and by com...

The mechanical relaxation behavior and microstructure of a series of novel norbornylPOSS organic-inorganic copolymers have been investigated. We have examined the influence on physical properties of both the weight fraction of POSS-norbornyl monomer and the corner group composition. POSS refers to the polyhedral oligomeric silsesquioxane inorganic/organic macromer, which is composed of an inorg...

A highly selective method for the synthesis of asymmetrically substituted carbocycles and heterocycles from unactivated aldehyde-olefin precursors has been achieved via enantioselective SOMO-catalysis. Addition of a catalytically generated enamine radical cation across a pendent olefin serves to establish a general asymmetric strategy toward the production of a wide range of formyl-substituted ...

Oxidative annulations for the synthesis of carbocycles were developed using a catalytic palladium(II) system. Indoles with pendant olefin tethers were oxidatively cyclized to form annulated products. Electron-rich aromatic systems were also investigated, culminating in the synthesis of benzofurans and dihydrobenzofurans by a similar protocol. These reactions were demonstrated to proceed by an i...

He(I) and He(II) photoelectron spectra are reported for (/^-CsHs^MLX (M = Nb, Ta; L = H, CO; X — propene, 1-butene, propyl) and some methylcyclopentadienyl derivatives. Also the spectra of some yr-allyl and dihalide complexes are reported. Unambiguous assignments could be made of the metal d ai orbital, the Cp orbitals, the olefin n ionization and the M-hydride and 7t-allyl orbitals. Very regul...