has been achieved. The key steps include the intramolecular SNAr reaction for construction of the densely functionalized xanthone skeleton, the stereoselective lactone cleavage using a chiral nucleophile to induce the axial stereochemistry, and the SmI2‐mediatedpinacol cyclization for the stereocontrolled conversion of axially chiral biaryl dialdehyde into the corresponding trans diol.
已经实现了对FD‐594六环核的立体控制访问。关键步骤包括:分子内S N Ar反应,用于构建密集功能化的蒽酮骨架;使用手性亲核试剂进行立体选择性内酯裂解,以诱导轴向立体化学;以及SmI 2介导的频哪醇环化,用于轴向控制性转化轴向手性联芳基二醛转化为相应的反式 二醇。
WHITE-EMITTING COMPOUNDS, PROCESS FOR THE PRODUCTION THEREOF, AND WHITE-EMITTING DEVICES
申请人:HIROSE ENGINEERING CO., LTD.
公开号:EP1650208A1
公开(公告)日:2006-04-26
The objective of the present invention is to provide a novel white light-emitting compound, which is a single substance, capable of emitting white light by itself, a simple process of preparing the white light-emitting compound, and a white light-emitting element including the white light-emitting compound. The white light-emitting compound according to the present invention is characterized by its structure represented by formula (1) :
wherein R1 denotes a hydrogen atom, an alkyl group with 1 to 10 carbon atoms, or a specified aryl group, wherein there are no cases where both R1 s are hydrogen atoms.
A series of 1D-, 2D-, and 3D-hydrogen-bonded organic frameworks (1D-, 2D-, and 3D-HOFs) force-driven by macrocyclic multifluorine tectons (F-tectons) was constructed on the basis of burgeoning multifluorinated diaminoterephthalates (25, 345, and 26). Crystalline 25 gave ladder-shaped 1D-HOFs containing one kind of macrocyclic F-tecton looped by two F···H(CH3) hydrogen bonds in competition with strong
One-Pot Synthesis of a Pentacyclic Bis(aminophenolic)bipyridone from Monocyclic Precursors
作者:Doetze J. Sikkema
DOI:10.1055/s-1993-26025
日期:——
1,4-cyclohexanedione-2,5-dicarboxylic methyl ester can be condensed with 2,4-diaminophenol, aromatized and cyclized to 3,10-diamino-2,9-dihydroxyquino [2,3-b]acridine-7(5H),14(12H)-dione in a one-pot procedure. The product must be handled with care to avoid oxidation; isolation as the hydrochloride salt allows convenient manipulation and purification to polymerization quality material.
Diaminoterephthalates: Scaffolds for Combinatorial Chemistry
作者:Rebekka Pflantz、Jens Christoffers
DOI:10.1002/chem.200802151
日期:2009.2.16
Fluorescent building blocks: Tetracarboxyamides with a central fluorescent diaminoterephthalate unit were prepared from succinyl succinates following a combinatorial‐like strategy. The 2,5‐diaminoterephthalates (see scheme; PG=protecting group) possess four points of diversification and are introduced as new scaffolds for combinatorialchemistry.