Novel ionic liquids as reaction medium for atom transfer radical polymerization of methyl methacrylate

Atom transfer radical polymerization （ATRP） of methyl methacrylate （MMA） employing ethyl 2-bromoisobutyrate （EBiB）/ CuBr as the initiating system was investigated at 50 ℃ in the absence of any additional ligand in the three room temperature ionic liquids （RTILs）, 1-methyl-imidazolium acetate （[mim][CH3COO]）, 1-methylimidazolium propionate （[mim][CH3CH2COO]） and 1-methylimidazolium butyrate （[mim][CH3CH2CH2COO]）, respectively. All the polymerization in the three RTILs proceeded in a well-controlled manner. The sequence of the apparent polymerization rate constants was kapp（[mim][CH3COO]） 〉 kapp（[mim] [CH3CH2COO]） 〉 kapp （[mim][CH3CH2CH2COO]）.

The Isomeric Structures of H_2GeLiF, the Prototype Germylenoid

The structures of four isomeric forms of the model germylenoid, H2GeLiF. have been examined by ah initio MO theory. The most stable structure is suggested to be the p-complex 1.The other three species. three-membered ring 2, δ-complex 3 and tetrahedron 4. are also local minima on the potential energy surface. but are higher in energy.

One pot synthesis of bis-silicon-bridged stilbene derivatives

Bis-silicon-bridged 芪衍生物在联合了二度的准备的一个修改过程被综合[2-(silyl ) 苯基] 乙炔和它的 intramolecular 在一个壶的减少的环合。结果显示一条壶途径在可比较的收益生产了目标产品到以前报导的二拍子的圆舞方法的。