A process for preparing a polyhydric alcohol according to the invention comprises subjecting a polyhydric alcohol compound having protected hydroxy group(s) to microwave irradiation in the presence of basic compound(s) or acid(s) having an acid dissociation exponent (pKa) of −8 to 3 at 25° C. to remove the protecting groups of the hydroxy group of the polyhydric alcohol compound. The invention can provide an industrially advantageous process for preparing polyhydric alcohols by readily removing protecting group(s) from protected hydroxy group(s) of polyhydric alcohol compounds.
Weak Interaction Based Interpretation of Crystal Packing Characteristics of Aromatic Rings Accumulating Molecules: Hirshfeld Surface Analyses Reinforced X-ray Crystal Study on 1,8-Dibenzoyl-7-Ethoxynaphthalen-2-ol and Its 2-Ethoxylated Homologue
surface. The general X-raycrystal structural analysis determined effective non-covalent bonding intra/intermolecular interactions to be the governing interactions for molecular packing based short interatomic distances. The minute spatial structure around respective interactions demonstrates the characteristics of non-covalent bonding interatomic interactions. The general X-raycrystal structural analysis
对具有相似分子式、仅区别一个取代基(即2-羟基和2-乙氧基)的两种二苯甲酰萘衍生物晶体中的分子环境进行了弱相互作用类型的比较研究,使用通过赫什菲尔德表面分析和穿过分子表面的归一化原子间距离的二维绘图强化的 X 射线晶体结构研究。一般的 X 射线晶体结构分析确定有效的非共价键分子内/分子间相互作用是基于短原子间距离的分子堆积的主导相互作用。各个相互作用周围的微小空间结构展示了非共价键原子间相互作用的特征。一般X射线晶体结构分析进一步揭示了整个晶体对称性与相互作用方式之间的关系。赫什菲尔德表面分析揭示了分子表面上短接触的位置。二维绘图展示了覆盖分子表面的相互作用原子对作为有效分子间非共价键相互作用的几何分布的贡献。根据非共价键相互作用的强度分类,特别是与分子接触指数的成比例/不成比例分布有关的强度分类,合理地解释了两种化合物所确定的堆积特征和接近度的差异。比较表明,优异的分子间相互作用集中在分
Packing structure and non-classical hydrogen bonding interactions of the toluene solvate crystal of 1,8-bis(4-methylbenzoyl)naphthalene-2,7-diyl dibenzoate: Role of toluene molecule in determination of the spatial arrangement of the major constituent molecules
body mainly act as the hydrogen acceptors of C–H…O and C–H…π non-classical hydrogen bonds. The naphthalene ring moderately contributes as the hydrogen acceptor for C–H…π non-classical hydrogen bonds and as the hydrogen donor for C–H…O non-classical hydrogen bonds. The roles of the toluene molecule are not limited to a simple filler for the void among the major constituentmolecules but proved to position
PROCESS FOR THE PREPARATION OF POLYHYDRIC ALCOHOLS
申请人:National Institute of Advanced Industrial Science and Technology
公开号:EP1298115A1
公开(公告)日:2003-04-02
A process for preparing a polyhydric alcohol according to the invention comprises subjecting a polyhydric alcohol compound having protected hydroxy group(s) to microwave irradiation in the presence of basic compound(s) or acid(s) having an acid dissociation exponent (pKa) of -8 to 3 at 25°C to remove the protecting groups of the hydroxy group of the polyhydric alcohol compound. The invention can provide an industrially advantageous process for preparing polyhydric alcohols by readily removing protecting group(s) from protected hydroxy group(s) of polyhydric alcohol compounds.
PHOTOSENSITIVE RESIN COMPOSITION, PHOTOSENSITIVE RESIN COMPOSITION FILM, CURED PRODUCT, INSULATING FILM AND MULTILAYER WIRING BOARD
申请人:Toray Industries, Inc.
公开号:EP3276414A1
公开(公告)日:2018-01-31
The present invention provides a photosensitive resin composition which forms a pattern having a rectangular cross section, high resolution and wide light exposure margin, and which is capable of forming a film that has excellent heat resistance. This photosensitive resin composition is characterized by containing (a) a polyimide which has, at a terminal of the main chain, at least one group selected from the group consisting of a carboxyl group, a phenolic hydroxyl group, a sulfonic acid group and a thiol group, (b) a monomer, (c) a thermally crosslinkable compound, (d) a photopolymerization initiator and (e) a polymerization inhibitor. This photosensitive resin composition is also characterized in that the polymerization inhibitor (e) is a compound that is obtained by adding at least one hydroxyl group, alkoxy group, aryloxy group or aralkyloxy group to a naphthalene skeleton or an anthracene skeleton of a compound having a naphthalene skeleton or an anthracene skeleton.