Synthesis of 1,1-bis(silyl)-1-alkene derivatives bearing Si–H functional groups via Peterson protocol

Dimethylsilanone Generation from Pyrolysis of Polysiloxanes Filled with Nanosized Silica and Ceria/Silica

Temperature-programmed desorption mass spectrometry (TPD MS) was used to study the pyrolysis of PDMS and its composites with nanosized silica and ceria/silica. The results suggest that the elusive organosilicon compound, dimethylsilanone, is generated from PDMS over a broad temperature range (in some cases starting at 70 °C). The presence of nano-oxides catalyzes this process. Ions characteristic of the fragmentation of dimethylsilanone under electron ionization are assigned with the aid of DFT structure calculations. Possible reaction mechanisms for dimethylsilanone generation are discussed in the context of the calculated kinetic parameters. Observed accompanying products of PDMS pyrolysis, such as tetramethylcyclodisiloxane and hexamethylcyclotrisiloxane, indicate that multiple channels are involved in the dimethylsilanone release.

Synthesis of 2-aryl-1,1-Bis(Silyl)Alkenes-Containing Tetrasubstituted Imidazoles Catalysed by M–Cu/ZSM-5 (M: Cr, Mn, Co, Ni, V, Zn and Fe) Zeolites-Supported Bimetallic Nanostructures

The one-pot synthesis of tetrasubstituted imidazoles by using a series of M-Cu/ZSM-5 (M: Cr, Mn, Co, Ni, V, Zn and Fe) zeolites-supported bimetallic catalysts was studied. Fe-Cu/ZSM-5 bimetallic oxide catalyst had the highest activity in improving the efficiency of the heterogeneous cyclo-condensation reaction. Some imidazole derivatives terminated by vinylbis(silanes) have been synthesised using (Me3Si)3CLi through the Peterson olefination reaction.