Anton A. Anisimov

Synthesis and structure of new polyhedral Ni, Na- and Cu, Na-metallasiloxanes with tolyl substituent at the silicon atom

Two new polyhedral tolyl-containing metallasiloxanes, {(Na+)2[TolSi(O)O−]6(Ni2+)4(Na+)4(OH−)2[TolSi(O)O−]6}*(EtOH)14(H2O)2 and {[CuSi(O)O−]12(Cu2+)4(Na+)4}*(EtOH)8}, and two new large stereoregular cyclosiloxanes, cis-[TolSi(O)OSiMe3]6 and tris-cis-tris-trans-[TolSi(O)OSiMe3]12, have been synthesized and their structures have been determined by X-ray crystallography.

Mechanochemistry – a new powerful green approach to the direct synthesis of alkoxysilanes

The present work shows a new one-stage mechanochemical method for the direct synthesis of alkoxysilanes by silicon mechanoactivation followed by a reaction with an alcohol. Alkoxysilanes were obtained with nearly complete silicon and alcohol conversion. This method allows for a considerable simplification of the traditional multistage process by eliminating three stages that include silicon and catalyst preparation, and adapts it to green chemistry requirements. Vibration milling removed the oxide film, and the mechanoactivation of the large silicon fraction (1000–2000 μm) occurs in the reactor working space. Abrasion of the reactor walls and grinding bodies made of brass results in a developed catalytic surface on silicon, as it has been proven by a set of physical analytical methods such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (PXRD), and X-ray photoelectron spectroscopy (XPS).

New star-like polydimethylsiloxanes: synthesis, properties, and application

New star-like polydimethylsiloxanes with a cis-tetraphenylcyclotetrasilsesquioxane fragment as the core (branching center) were synthesized and characterized. The thermophysical properties of the obtained polymers were studied by DSC and TGA. The epoxy resin surface modified with the obtained polymers was analyzed by XPS.