Cascade annulative π-extension for the rapid construction of carbazole based polyaromatic hydrocarbons
作者:Samrat Kundu、Ankush Banerjee、Shyam Chand Pal、Meghna Ghosh、Modhu Sudan Maji
DOI:10.1039/d1cc00668a
日期:——
Brønsted acid catalyzed cascade benzannulation strategy for the concise synthesis of benzo[a]carbazoles is reported. Efficacy of the methodology was further validated by synthesizing structurally diverse, extensive π-conjugated carbazole based PAHs.
COMPOUND FOR ELECTROLUMINESCENT DEVICE AND ORGANIC ELECTROLUMINESCENT DEVICES USING THE SAME
申请人:Balaganesan Banumathy
公开号:US20130048956A1
公开(公告)日:2013-02-28
The present invention provides a compound of formula (I) for an organic electroluminescent device:
wherein X
1
, X
2
, X
3
, Y, Ar
1
, Ar
2
, Ar
3
, Ar
4
, Ar
5
, Ar
6
, and Ar
7
are as defined in the description.
A method for preventing deposition of polymer scale and a coating agent therefor
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP0126991A1
公开(公告)日:1984-12-05
The invention provides a method for preventing deposition of polymer scale on the reactor walls in the polymerization of an ethylenically unsaturated monomer, in particular, by emulsion polymerization. The method comprises coating the reactor walls with a coating composition containing, as the essential components, (A) an organic compound having at least 5 conjugated π bonds in a molecule, (B) a chelating agent and (C) a metal compound capable of producing metal ions having a coordination number of at leas 2 which presumably forms a metallic chelate compound with the chelating agent contributing to the formation of a strongly adsorbed layer on the reactor walls. The coating composition may be further admixed with a silicic acid compound such as a colloidal silica.
Novel compounds that contain azadibenzofuran, azadibenzothiophene, and azadibenzoselenophene with fused rings that can be used as a host material in phosphorescent OLEDs is disclosed.