Selective Monoarylation of Benzenediols via Dianion Intermediates
作者:Chaoyu Xie、Kevin A. Sullivan、Michael E. Laurila、David N. Mitchell、Y. John Pu
DOI:10.1080/00397910701648769
日期:2007.12.1
Abstract Application of the SNAr reaction on benzenediols with arylfluorides revealed an enhancement in monosubstitution selectivity over bis substitution when excess base was used. This trend was studied using symmetrical and nonsymmetrical benzenediols with various levels of steric hindrance. The effect of various bases was examined. A 100% monoselectivity was achieved in the presence of 2.5 equiv
Synthesis of Novel Amide Derivatives with In Vitro Antiproliferative and Cytotoxic Activity
作者:Ying Liu、Guo-Yan Zhang、Yang Li、Ya-Nan Zhang、Song-Zhi Zheng、Zhao-Xia Zhou、Sheng-Ji An、Ying-Hua Jin
DOI:10.1002/hc.21057
日期:2013.1
Some amidederivatives are highly valuable products with antiproliferative and cytotoxic bioactivity. In this paper, 12 novelamide compounds were synthesized correspondingly by boc-protection glycine, deprotection, and condensation reactions. The antiproliferative and cytotoxicactivity of these compounds was also evaluated by human cervical cancer (Hela) and hepatoma carcinoma (SK-Hep-1) cancer cell
Novel diisocyano-based dinuclear gold(I) complexes with aggregation-induced emission and mechanochromism characteristics
作者:Zhao Chen、Zheng Li、Lan Yang、Jinhua Liang、Jun Yin、Guang-Ao Yu、Sheng Hua Liu
DOI:10.1016/j.dyepig.2015.05.021
日期:2015.10
properties, suggested ortho-isomer luminogen 1 exhibited reversible mechanochromic fluorescence, whereas meta-isomer luminogen 2 showed switchable mechanical force-induced luminescenceenhancement behavior. No mechanochromism behavior was observed for para-isomer luminogen 3. Powder X-ray diffraction indicated that the morphology phase conversion between crystalline and amorphous states is responsible
CRYSTALLINE POLYIMIDE FOR MELT MOLDING WITH SATISFACTORY THERMAL STABILITY
申请人:Mitsui Chemicals, Inc.
公开号:EP1090945A1
公开(公告)日:2001-04-11
A thermoplastic polyimide having good thermal stability, comprising a repeating unit represented by the chemical formula (1), a molecular terminal being composed of the chemical formula (2) and/or chemical formula (3), characterized in that:
a melt viscosity ratio calculated by the numerical formula (1) and/or the numerical formula (3) is within a numerical range shown in the numerical formula (2) and/or the numerical formula (4) and 1,3-bis(4-aminophenoxy)benzene represented by the chemical formula (3) for production of the above polyimide, characterized in that the content of an azo compound is from 0.0 to 0.2%.
The thermoplastic polyimide of the present invention has excellent characteristics ① to ④ described below. ① It is superior in thermal stability on melting. That is, the degree of lowering of the fluidity on melting with a lapse of time is small and it is possible to apply to conventional melt molding. ② It has high heat resistance. ③ It is superior in productivity. ④ It is superior in dimensional accuracy.