pentafluorophenyltrimethylsilane (I) and cyanomethyltrimethylsilane (II) with enolizable ketones in the presence of a catalytic amount of potassium cyanide-18-crown-6 complex gave the corresponding trimethylsilyl enolethers. The same dehydrogenative silylation of acetylacetone and benzoylacetone with silane I was extended to the preparation of 2,4-bis(trimethylsiloxy)-1,3-pentadiene and 1-phenyl-1,3 -bis(trimethylsiloxy)-1
在催化量的氰化钾-18-冠-6配合物存在下,用可烯丙基化的酮处理五氟苯基三甲基硅烷(I)和氰基甲基三甲基硅烷(II),得到相应的三甲基甲硅烷基烯醇醚。乙酰丙酮和苯甲酰基丙酮与硅烷I的相同脱氢甲硅烷基化反应扩展到了2,4-双(三甲基甲硅烷氧基)-1,3-戊二烯和1-苯基-1,3-双(三甲基甲硅烷氧基)-1,3-丁二烯的制备, 分别。在相同条件下用二甲基双(五氟苯基)硅烷对乙酰丙酮和苯甲酰基丙酮进行脱氢甲硅烷基化反应,得到了新颖的杂环基5-亚甲基-2,6-二氧杂-1-硅酰基己烯-3-烯。在研究的反应中,硅烷的甲硅烷基化能力按Me 3 SiCN⋍Me 2 Si(CN)2的顺序增加<Me 3 SiCH 2 CN <Me 3 SiC 6 F 5> Me 2 Si(C 6 F 5)2。另一方面,氰化钾-18-冠-6配合物催化将硅烷I或II加成至不可烯化的化合物如苯甲醛,巴豆醛和甲基(三乙基锗基)乙烯酮的羰基上。
Monosodium acetonitriles, their preparation, properties and reactions
作者:Carl Krüger
DOI:10.1016/s0022-328x(00)92412-4
日期:1967.7
Monosodium acetonitrile and homologous compounds are prepared by the reaction of sodium bis(trimethylsilyl)amide with acetonitrile or the corresponding nitriles in either solution at low temperature. The IR and NMR spectra of these compounds are discussed. Sodium acetonitrile adds to polar double bonds (carbonyl and cyano groups) only. It is shown that sodium acetonitrile and analogous compounds are
Calcined MgAICO<sub>3</sub>-HT Catalysed Cyanosilylation of Carbonyl Compounds and Nucleophilic Ring Opening of Oxiranes Using TMSCN
作者:B. M. Choudary、N. Narender、V. Bhuma
DOI:10.1080/00397919508011830
日期:1995.9
Nucleophilic addition of TMSCN to carbonyl compounds is found to be catalysed efficiently using hydrotalcite as a solid base. The catalyst is also found to be active in the nucleophilicringopening of oxiranes giving high regioselectivity.
Epoxides can be opened under neutral conditions with TMSN3 and TMSCN in the presence of catalytic amounts of Lewis acid, affording the corresponding ring-opened compounds in high yields.