Synthesis, Electrochemical and Optical Properties of Stable Yellow Fluorescent Fluoranthenes
摘要:
A novel series of thermally stable yellow light emitting fluoranthenes with an amine donor and a nitrite acceptor was prepared from a ketene-S,S-acetal under mild conditions without using an organometal catalyst. The organic light emitting device of yellow fluoranthene 10b exhibited substantially low turn-on voltage (2.6 V) and maximum brightness of 470 Cd/m(2) with luminance efficiency of 2.0 Cd/A without using any dopant.
An efficient substituent dependent synthesis of congested pyridines and pyrimidines
作者:Ramendra Pratap、Brijesh Kumar、Vishnu Ji Ram
DOI:10.1016/j.tet.2007.07.062
日期:2007.10
An efficient and versatile synthesis of various congested pyridines 3a–h, 6a,b, 8a–n, 10a–g, and 16a,b, and (pyrimidin-4-yl)acetonitriles 13a–g has been delineated by base catalyzed ring transformation of suitably functionalized 2H-pyran-2-ones 1a–h, 5, 7, and 15 by formamidineacetate 2a, acetamidine hydrochloride 2b, S-methylisothiourea 9a, pyrazol-1-yl-carboxamidine 9b, and arylamidine hydrochloride
Regioselective synthesis of functionalized naphtho[b]thiophenes through a ‘lactone methodology’
作者:Manish Dixit、Atul Goel
DOI:10.1016/j.tetlet.2006.03.081
日期:2006.5
Benzo[b]thiophene and its benzannulated derivatives are important classes of compounds due to their unique chemical properties and biosteric relationship with indole. In this letter, we report a convenient route for the synthesis of substituted naphtho[b]thiophenes through a ring transformation reaction of suitably functionalized 2H-pyran-2-ones with 6,7-dihydro-5H-benzothiophene-4-one, in good yields
苯并[ b ]噻吩及其苯甲环化衍生物由于其独特的化学性质和与吲哚的生物立体关系而成为重要的化合物。在这封信中,我们报告了通过适当官能化的2 H-吡喃-2-酮与6,7-二氢-5 H-苯并噻吩-4-酮的环转化反应,合成取代的萘并[ b ]噻吩的简便方法,收益率很高。
One-pot regioselective synthesis of dihydronaphthofurans and dibenzofurans
A regioselective approach for the synthesis of substituted naphthofurans and dibenzofurans has been demonstrated through a ring transformation reaction of suitably functionalized 2H-pyran-2-ones by reaction with 6,7-dihydro-5H-benzofuran-4-one and 7-methoxybenzofuran-3-one, respectively, in high yields. The novelty of the procedure lies in the creation of an aromatic ring transformed by 2H-pyran-2-one involving the -COCH2- moiety of a cyclic ketone. (c) 2006 Elsevier Ltd. All rights reserved.