Biphenyl-3,4′-diol derived bent-core compounds with branched side chains have been synthesized and characterized to study the influence of terminal branched groups on mesophase properties and transition temperatures of bent-core mesogens. The liquid crystalline properties of the compounds were investigated by differential scanning calorimetry, optical polarizing microscopy and X-ray scattering. Depending on the length of the chain, the size of molecular branches and the position of branched chains, either enantiotropic or monotropic rectangular columnar phases were observed. For one of the compounds combining two different branched side chains, a new type of optically isotropic dark conglomerate phase (MIso[*]) was found. It is proposed to be a distorted version of a non-tilted or only slightly tilted B6-like intercalated smectic phase with additional in plane order.
我们合成了具有支化侧链的联苯-3,4′-二醇衍生弯曲核化合物,并对其进行了表征,以研究末端支化基团对弯曲核介质的介相性质和转变温度的影响。通过差示扫描量热法、光学偏光显微镜和 X 射线散射法研究了这些化合物的液晶特性。根据分子链的长度、分子分支的大小和分支链的位置,可以观察到各向同性或各向同性的矩形柱状相。对于其中一种结合了两种不同支链侧链的化合物,发现了一种新型光学各向同性暗砾石相(MIso[*])。据推测,它是一种无倾斜或仅有轻微倾斜的 B6 类插层 Smectic 相的扭曲版本,具有额外的平面顺序。
OLIGONUCLEOTIDE WITH PROTECTED BASE
申请人:Ajinomoto Co., Inc.
公开号:US20130267697A1
公开(公告)日:2013-10-10
The present invention provides a protected nucleotide for elongation, which can be purified efficiently and in a high yield by a liquid-liquid extraction operation, and can achieve an oligonucleotide production method by a phosphoramidite method.
It has been found that the above-mentioned problem can be solved by a particular oligonucleotide comprising a protected base and/or particular oligonucleotide protected by a branched chain-containing aromatic group at 3′-position.
The present invention provides a protected nucleotide for elongation, which can be purified efficiently and in a high yield by a liquid-liquid extraction operation, and can achieve an oligonucleotide production method by a phosphoramidite method.
It has been found that the above-mentioned problem can be solved by a particular oligonucleotide comprising a protected base and/or particular oligonucleotide protected by a branched chain-containing aromatic group at 3′-position.