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首页> 外文期刊>Chemistry: A European journal >Monosaccharides as Silicon Chelators:Pentacoordinate Bis(diolato)(phenyl)silicates with the cis-Furanose Isomers of Common Pentoses and Hexoses
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Monosaccharides as Silicon Chelators:Pentacoordinate Bis(diolato)(phenyl)silicates with the cis-Furanose Isomers of Common Pentoses and Hexoses

机译：单糖作为硅螯合剂：五配位双（二醇基）（苯基）硅酸盐与常见戊糖和己糖的顺式呋喃糖异构体

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摘要

Five-coordinate phenylsili-cates are formed from the reaction of trimethoxy(phenyl)silane with mono-saccharides in methanol in the presence of a stoichiometric amount of base.Five complexes have been isolated and characterized with two ketoses and three aldopentoses.The silicon central atom in [K([18]crown-6)] [PhSi(beta-D-Fruf2,3H_2)_2]-MeOH (1,Fru = fructose) is part of two chelate rings,with the ligands being beta-D-fructo-furanose-O~2,O~3 dianions.The p-fura-nose isomer is best suited for silicon li-gation because it exhibits a torsion angle close to 0~° for the most acidic diol function,thus assuring a flat chelate ring.The same structural principles are also found in [K([18]crown-6)] [PhSi(beta-D-Araf1,2H_2)_2] centre dot 2 MeOH (2,Ara = arabinose),[K([18]crown-6)][PhSi-(alpha-D-Ribfl,2H_2)_2] (3,Rib = ribose),[K([18]crown-6)][PhSi(alpha-D-Xylfl,2H_2)_2]centre dot acetone (4,Xyl = xylose),and [K([18]-crown-6)][PhSi(alpha-D-Rulf2,3H_2)_2] (5,Rul = ribulose).
机译：五配位苯基硅酸酯是由三甲氧基（苯基）硅烷与单糖在甲醇中在化学计量的碱存在下反应形成的，已分离出五种配合物，并用两个酮糖和三个醛糖苷进行了表征。 [K（[18] crown-6）] [PhSi（beta-D-Fruf2,3H_2）_2] -MeOH（1，Fru =果糖）中的原子是两个螯合环的一部分，配体为β-D-果糖-呋喃糖-O〜2，O〜3二价阴离子。对-呋喃糖-鼻异构体最适合硅连接反应，因为它在最酸性的二醇官能团中表现出接近0〜°的扭转角，因此可确保平坦在[K（[18] crown-6）] [PhSi（beta-D-Araf1,2H_2）_2]中心点2 MeOH（2，Ara =阿拉伯糖），[K（ [18] crown-6）] [PhSi-（alpha-D-Ribfl，2H_2）_2]（3，Rib =核糖），[K（[18] crown-6）] [PhSi（alpha-D-Xylfl， 2H_2）_2]中心点丙酮（4，Xyl =木糖）和[K（[18]-皇冠-6）] [PhSi（alpha-D-Rulf2,3H_2）_2]（5，Rul =核糖）。

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