Palladium-catalyzed direct ortho C X bond construction via C H activation of azobenzenes: Synthesis of (E)-1,2-b(2,6-dibromo(chloro)-phenyl)diazene
摘要:
A palladium-catalyzed direct C-X bond formation of azobenzenes with 1,3-dibromo-5,5-dimethylhydantoin or trichloro isocyanuric acid via C-H activation has been developed. The reaction could proceed smoothly under an air atmosphere at 110 degrees C in the presence of Pd(Ph3P)(4) in DCE and 13 examples of products were obtained. (C) 2019 Elsevier Ltd. All rights reserved.
A smart approach to achieve an exceptionally high loading of metal nanoparticles supported by functionalized extended frameworks for efficient catalysis
selectively oxidized to afford high yields of azoxyarenes by using 30% hydrogen peroxide and selenium dioxide as catalyst in methanol at room temperature. The oxidation of 4-alkoxyanilines under the same reaction conditions furnishes the corresponding 4-alkoxy- N-(4-nitrophenyl)anilines in reasonable yields, alongside other oxidation by-products. The structure of 4-methoxy- N-(4-nitrophenyl)aniline is elucidated
A one-pot synthesis (yields over 50%) of methyl and ethyl esters from aldehydes (and the corresponding alcohol), using aromatic nitrocompounds as oxidizing agents under the catalytic action of cyanide ion or of a conjugate base of a thiazolium ion, is described. A variety of by-products (α-hydroxybenzylidenaniline) (16), α-methoxybenzylidenaniline (21), α-cyanobenzylidenaniline (27), N1-hydroxy-N1
A smart approach to achieve an exceptionally high loading of metal nanoparticles supported by functionalized extended frameworks for efficient catalysis
Pores of MOFs were decorated with terminal alkyne to achieve very high loading of gold nanoparticles for efficient catalytic reduction of aromatic nitro-compounds.
MODIFIER FOR AROMATIC POLYESTER AND AROMATIC POLYESTER RESIN COMPOSITION COMPRISING THE SAME
申请人:TABATA Masayoshi
公开号:US20110224343A1
公开(公告)日:2011-09-15
The present invention provides a modifier for aromatic polyesters which enhances the melt fluidity of aromatic polyesters without a significant decrease in the heat resistance of the aromatic polyesters, and an aromatic polyester resin composition including the modifier for aromatic polyesters. The present invention relates to a modifier for aromatic polyesters comprising polyhydric phenol residues and residues of aromatic polycarboxylic acid, acid halide or acid anhydride thereof, and the modifier comprises a material having a structure composed of a first residue selected from the group consisting of divalent residues represented by Formula (I): —Ar—W
1
x
—Ar— and by Formula (II): —Ar—, the first residues being bonded to two identical or different second residues selected from the group consisting of monovalent residues represented by Formula (III):
and monovalent residues represented by Formula (IV): —O—C(O)—R
7
—.
AbstractA method of directsynthesis of ortho-acyloxylated azoarenes via palladium-catalyzed C–Hbondactivation was developed. The reaction proceeded was smoothly at room temprature and have better yield in shorter times. The obtained ortho-acyloxylated azoarenes could be efficiently converted into 2-hydroxyazobenzenes in good yields through a hydrolysis process.Graphical AbstractMany various ortho-acyloxylated