Stereospecific synthisis of 2,3-dihydro-2-metallaphenalenes, meso-[M(η-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>R<sub>2</sub>][M = Zr, Hf; R<sub>2</sub>=(CHSiME<sub>3</sub>)<sub>2</sub>C<sub>10</sub>H<sub>6</sub>], via an unstable dilithium reagent, [R<sub>2</sub>{Li(tmeda)}<sub>2</sub>](tmeda = tetramethyl-ethylenediamine), which is coverted the complex [CHSiME<sub>2</sub>C(SiMe<sub>3</sub>)C<sub>10</sub>H<sub>6</sub>][Li(tmeda)]<sub>2</sub>containing a silicon heterocycle dicarbanion
作者:Rocco I. Papasergio、Colin L. Raston
DOI:10.1039/c39820001023
日期:——
In situ Grignard reactions of 1,8-(ClCH2)2C10H10H6 have yielded 2,3-dihydro-2,2-dimethyl-2-silaphenalene, which can be selectively momolithiated at the 1-position, and 1,8-(Me3SiCH2)2C10H6, a compound readily dilithiated and subsequuently converted into the zirconium and hafnium metallacycles, meso-[M(η-C5H5)2(CHSiME3)2C10H6]; the dilithium complex is converted into the complex [[graphic omitted]C10H6][Li(tmeda)]2 containing a silicon heterocycle dicarbanion and characterized as the substituted silaphenalene, the same product as the ClSiMe3 adducts of momo-lithiated silaphenalene.
1,8-(ClCH2)2C10H10H6原位格氏反应生成了 2,3-二氢-2,2-二甲基-2-硅杂萘,它可以在 1-位选择性地发生摩莫利特化、和 1,8-(Me3SiCH2)2C10H6,这种化合物很容易被二硫化,并随后转化为锆和铪金属环,介-[M(δ--C5H5)2(CHSiME3)2C10H6];二锂络合物转化为[[图形省略]C10H6][Li(tmeda)]2络合物,该络合物含有硅杂环二卡班尼,其特征为取代的硅萘,与momo-锂化硅萘的ClSiMe3加合物是相同的产物。