Pd/mannose promoted tandem cross coupling-nitro reduction: expedient synthesis of aminobiphenyls and aminostilbenes
作者:Sandeep Rohilla、Pradeep Pant、Nidhi Jain
DOI:10.1039/c5ra04129e
日期:——
d-Mannose as a ligand for Pd catalyzed cross-coupling, and as a hydrogen source for nitro reduction in a modular one-pot cross coupling-nitro reduction sequence.
d-甘露糖作为钯催化的交叉偶联反应的配体,以及作为模块化的一锅交叉偶联-硝基还原序列中的氢源。
Palladium-Catalyzed Suzuki Reactions in Water with No Added Ligand: Effects of Reaction Scale, Temperature, pH of Aqueous Phase, and Substrate Structure
作者:Zhao Li、Carol Gelbaum、William L. Heaner、Jason Fisk、Arvind Jaganathan、Bruce Holden、Pamela Pollet、Charles L. Liotta
DOI:10.1021/acs.oprd.6b00180
日期:2016.8.19
The heterogeneous palladium-catalyzedSuzukireactions between model aryl bromides (4-bromoanisole, 4-bromoaniline, 4-amino-2-bromopyridine, and 2-bromopyridine) and phenylboronic acid have been successfully conducted in water with no added ligand at the 100 mL scale using 20–40 mmol of aryl bromide. The product yields associated with these substrates were optimized, and key reaction parameters affecting
[EN] METHOD OF PURIFYING DIANHYDRIDES, THE DIANHYDRIDES FORMED THEREBY, AND POLYETHERIMIDES FORMED THEREFROM<br/>[FR] PROCÉDÉ DE PURIFICATION DES DIANHYDRIDES, DIANHYDRIDES AINSI OBTENUS, ET POLYÉTHERIMIDES FORMÉS À PARTIR DE CEUX-CI
申请人:SABIC INNOVATIVE PLASTICS IP
公开号:WO2009120212A1
公开(公告)日:2009-10-01
A method for purifying an oxydiphthalic anhydride comprises diluting a first mixture comprising an oxydiphthalic anhydride, a solvent, a catalyst, and an inorganic salt with a solvent, to provide a second mixture having a solids content of 10 to 30 percent based on total weight of the second mixture; filtering and washing the solids of the second mixture at a temperature below the crystallization point temperature of the oxydiphthalic anhydride to provide a third mixture; hydrolyzing the third mixture by adding water and a water-soluble acid to form a fourth mixture; heating the fourth mixture; then cooling to provide a solid-liquid mixture, optionally decanting a portion of the liquid, re diluting the remaining solid-liquid mixture, then filtering to provide a solid component; washing the solid component with water to provide a fifth mixture of oxydiphthalic tetra acid and water; ring closing the oxydiphthalic tetra acid to provide oxydiphthalic anhydride, and filtering the oxydiphthalic anhydride.
To provide a novel diamine, and a polyimide precursor and a polyimide using it. A diamine represented by the formula (1):
wherein each of X
1
and X
5
which are independent of each other, is a single bond or the like; each of X
2
and X
4
which are independent of each other, is —CH
2
— or the like; X
3
is a C
1-6
alkylene or the like; each of Y
1
and Y
2
which are independent of each other, is a single bond or the like; R is a C
1-20
linear, branched or cyclic hydrocarbon group; and a is 0 or 1).
A cyclic carbodiimide compound which is useful as an end-sealing agent for polymer compounds. The cyclic carbodiimide compound is represented by the following formula (i):
In the above formula, X is a divalent group or a tetravalent group represented by the following formula (i-4). When X is divalent, q is 0 and when X is tetravalent, q is 1. Ar
1
to Ar
4
are each independently an aromatic group. They may be substituted by an alkyl group having 1 to 6 carbon atoms or phenyl group.