Investigations into the preparation of sila-β-diketones via 2-trimethylsilyl-1,3-dithianes: structural characterization of a second polymorph of bis(2,2,6,6-tetramethyl-2-sila-3,5-heptanedionato)copper(II)
作者:Rolf U Claessen、Andrei M Kornilov、Kulbinder K Banger、Silvana C Ngo、Seiichiro Higashiya、Christopher C Wells、Evgeny V Dikarev、Paul J Toscano、John T Welch
DOI:10.1016/j.jorganchem.2003.09.032
日期:2004.1
condensation of the anion of 2-trimethylsilyl-1,3-dithiane with 1-bromo-3,3-dimethylbutan-2-one, followed by unmasking of the latent carbonyl moiety with HgO/HgCl2. A monoclinic polymorph of the known copper(II) complex, Cu(tmshd)2, was crystallized and studied by X-ray diffraction methods and found to be disordered like the orthorhombic one. Attempts to synthesize the disilylated β-diketone, 2,2,6,6-tetramethyl-2
通过将2-三甲基甲硅烷基-1,3-二硫杂环丁烷的阴离子与1的缩合反应合成2,2,6,6-四甲基-2-silaheptane-3,5-二酮(tmshdH)的sila-β-二酮-溴-3,3-二甲基丁烷-2-酮,然后用HgO / HgCl 2掩盖潜在的羰基部分。通过X射线衍射方法对已知铜(II)配合物的单斜晶型Cu(tmshd)2进行了结晶和研究,发现其像正交晶体一样无序。尝试使用二噻吩合成二甲化的β-二酮,2,2,6,6-四甲基-2,6-二硅庚烷-3,5-二酮和单甲硅烷基化的4,4-二甲基-4-sila-3-氧代戊醛方法未成功。但是,1,3-二噻烷基前体,与杂质一起2,2 ' -双(三甲基硅烷基)-2,2 '晶体学研究了-bi-1,3-二硫杂环丁烷。对于这些分子,观察到对固态键合参数的大的立体电子和空间位阻效应。