However, the typical inertness of unactivated Si-C(sp3) bondsunder conventional reaction conditions has hampered the application of simple tetraalkylsilanes in organic synthesis. Herein we report the chemoselective cleavage of Si-C(sp3) bonds of unactivated tetraalkylsilanes using iodine tris(trifluoroacetate). The reaction proceeds smoothly undermildconditions (-50 °C to room temperature) and tolerates
Magnesium-promoted reductivesilylation of 2- and 4-vinylpyridines with chlorotrialkylsilanes in N-methylpyrrolidinone at room temperature led to the selective formation of a variety of the corresponding β-mono-silylated compounds at the terminal carbon atom in good to excellent yields, whereas silylation of 3-vinylpyridine under the same reduction conditions failed to give a complex mixture of silylated
Addition of Trichlorosilane to Styrene, 2 Vinylpyridine, Allylcyanide and Octene-1
作者:Shun’ichi Nozakura
DOI:10.1246/bcsj.29.784
日期:1956.7
Addition reactions of trichlorosilane to styrene, 2-vinylpyridine, allylcyanide, and octene-1 were attempted in the presence of bases such as pyridine and in the presence of tetrapyridine nickel(II) chloride. The structures of the reaction products were established. In the presence of bases, trichlorosilane was added to 2-vinylpyridine and allylcyanide, yielding 2-β-trichlorosilylethylpyridine and
在吡啶等碱和四吡啶氯化镍 (II) 存在下,尝试了三氯硅烷与苯乙烯、2-乙烯基吡啶、烯丙基氰化物和辛烯-1 的加成反应。建立了反应产物的结构。在碱存在下,将三氯硅烷加入到 2-乙烯基吡啶和烯丙基氰化物中,分别生成 2-β-三氯甲硅烷基乙基吡啶和 β-三氯甲硅烷基丁腈。另一方面,在四吡啶氯化镍存在下,对所有检测的乙烯基化合物进行添加。(没有尝试2-乙烯基吡啶。)然而,在这种情况下,证明加成产物由两种位置异构体组成,其发生是由于加成方向不同,对于每种起始乙烯基化合物。
We report rhodium complexes bearing PAlP pincerligands with an X-type aluminyl moiety. IR spectroscopy and single-crystal X-ray diffraction analysis of a carbonyl complex exhibit the considerable σ-donating ability of the aluminyl ligand, whose Lewis acidity is confirmed through coordination of pyridine to the aluminum center. The X-type PAlP-Rh complexes catalyze C2-selective monoalkylation of pyridine
我们报告了带有 X 型铝基部分的 PAlP 钳形配体的铑配合物。羰基配合物的红外光谱和单晶 X 射线衍射分析表明铝基配体具有相当大的 σ 供体能力,其路易斯酸性通过吡啶与铝中心的配位得到证实。X 型 PAlP-Rh 配合物催化吡啶与烯烃的 C2 选择性单烷基化。
A convenient palladium-catalyzed coupling approach to 2,5-disubstituted pyridines