Transfer Hydrosilylation

Transfer hydrogenation is without question a common technology in industry and academia. Unlike its countless varieties, conceptually related transfer hydrosilylations had essentially been unreported until the recent development of a radical and an ionic variant. The new methods are both based on a silicon‐substituted cyclohexa‐1,4‐diene and hinge on the aromatization of the corresponding cyclohexadienyl radical and cation intermediates, respectively, concomitant with homo‐ or heterolytic fission of the Si? C bond. Both the radical and ionic transfer hydrosilylation are brought into context with one other in this Minireview, and early insight into the possibility of transfer hydrosilylation is included. Although the current state‐of‐the‐art is certainly still limited, the recent advances have already revealed the promising potential of transfer hydrosilylation.     

水杨酰苯胺衍生物分子内电荷/质子转移荧光

将苯甲酰苯胺(BA)类电荷转移(CT)反应基团耦合到具有激发态分子内质子转移(ESIPT)反应通道的水杨酸(SA)分子中,设计合成了苯胺对/间位取代的水杨酰苯胺及其羟基甲基化衍生物邻甲氧基苯甲酰苯胺,考察了环己烷、乙醚、乙腈和甲醇中两类水杨酰苯胺衍生物吸收光谱和荧光光谱的溶剂效应和取代基效应.结果表明,水杨酰苯胺的荧光为SA-型质子转移(PT)荧光,对取代基的依赖性较小;当电子给体苯胺基的给电子能力提高时,如N-甲基水杨酰苯胺分子,其荧光为BA-型CT荧光.而羟基甲基化后的衍生物邻甲氧基苯甲酰苯胺则表现出与BA类似的荧光光谱特性,具有明显的取代基效应.认为水杨酰苯胺衍生物的激发态存在着相互竞争的BA-型CT和SA-型PT通道,二者可经苯胺基上取代基的电子效应调控.     

复合材料树脂传递模塑工艺及适用树脂

简要介绍树脂模型工艺（RTM）的基本原理,优点及适用树脂的特性;对适用于RTM工艺的先进基体树脂进行综述,并介绍了国内外的商业开发情况。     

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The copyright to this article is transferred to Chinese Chemical Society and Institute of Chemistry,CAS and Springer(respective to owner if other than Chinese Chemical Society and Institute of Chemistry,CAS and Springer and for U.S.government employees:to the extent transferable) effective if and when the article is accepted for     

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Transfer ribonucleic acids

Transfer ribonucleic acids (tRNAs)

1 Abbreviations used according to IUPAC-IUB convention: tRNA = transfer ribonucleic acid; tRNA_yeast = mixture of tRNAs from yeast; tRNA^Phe = phenylalanine specific tRNA; Phe-tRNA = tRNA esterified (“charged”) with Phe; mRNA = messenger RNA; DNA = deoxyribonucleic acid; U = uridine; A = adenosine; C = cytidine; G = guanosine; pA = 5′-adenylic acid; Ap or A- = 3′-adenylic acid; m²′G = 2′-O-methyl guanosine; m⁷G = 7-methyl guanosine; mG = N(2)-dimethyl guanosine; other methylated nucleosides are abbreviated analogously; abbreviations of other odd nucleosides are given with Fig. 2; p or – signifies phosphate; RNase = ribonuclease; DEAE = diethylaminoethyl; fMet = N-formayl methionine.

occur in all living organisms. In biological protein synthesis they accept activated amino acids which are then transferred to growing peptide chains. With molecular weights lying between 25000 and 30000, tRNAs are easily within the reach of today's physical, chemical, and biochemical methods. The primary structures of several tRNAs as well as some relationships between structure and function have been elucidated. Three-dimensional structure, specificity, and mechanism of action are the subjects of present research efforts.     

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