Synthesis of Primary Aromatic Amides by Aminocarbonylation of Aryl Halides Using Formamide as an Ammonia Synthon
作者:Anita Schnyder、Matthias Beller、Gerald Mehltretter、Thomas Nsenda、Martin Studer、Adriano F. Indolese
DOI:10.1021/jo015577t
日期:2001.6.1
Primary aromatic amides were prepared by a palladium-catalyzed aminocarbonylation reaction of aryl halides in high yields (70-90%) using formamide as the amine source. The reactions require a palladium catalyst in combination with a nucleophilic Lewis base such as imidazole or 4-(dimethylamino)pyridine (DMAP). Aryl, heteroaryl, and vinyl bromides and chlorides were converted to the primary amides under
Designing a Cr-catalyst bearing redox non-innocent phenalenyl-based ligand towards hydrosilylative CO<sub>2</sub> functionalization
作者:Soumi Chakraborty、Arpan Das、Jasimuddin Ahmed、Sayani Barman、Swadhin K. Mandal
DOI:10.1039/d0cc05348a
日期:——
A Cr(iii)-complex bearing a redox non-innocent ligand initiates SET mediated silylative functionalization of CO2.
一种携带氧化还原非无辜配体的Cr(iii)络合物引发了SET介导的CO2硅基官能化反应。
Synthesis of Unsymmetrical Aroyl Acyl Imides by Aminocarbonylation of Aryl Bromides
作者:Anita Schnyder、Adriano F. Indolese
DOI:10.1021/jo016076a
日期:2002.1.1
Aroyl imides were prepared by a palladium-catalyzed aminocarbonylation reaction of aryl bromides with carbon monoxide and primary amides in good yields (58-72%). The reactions were carried out under mild conditions (5 bar, 120 degreesC) using 1 mol % of a palladium phosphine complex. Several aryl bromides were reacted with formamide, acetamide, benzamide, and benzenesulfonamide, respectively. For activated aryl bromides, a phosphine-to-palladium ratio of 2:1 was sufficient, but less reactive aryl bromides required a ligand-to-palladium ratio of 6:1 in order to stabilize the catalyst and achieve full conversion. The imides were very sensitive to aqueous basic conditions and were easily converted to aroyl amides or benzoic acids.
Optical compensation films having positive birefringence for liquid crystal display
申请人:Zheng Xiaoliang Joe
公开号:US20080239491A1
公开(公告)日:2008-10-02
A method for controlling positive birefringence in an optical compensation film (positive C-plate) having high positive birefringence throughout the wavelength range 400 nm<λ<800 nm is provided. The method includes selecting polymers with optically anisotropic subunits (OASUs) that exhibit the buttressing effect, wherein the OASUs may be disks, mesogens or aromatic rings substituted with birefringence enhancing substituents. The method further includes processing the polymer by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. These optical compensation films may be used in LCDs, particularly IPS-LCDs.
Optical compensation films with disk groups for liquid crystal display
申请人:Harris Frank W.
公开号:US20080241428A1
公开(公告)日:2008-10-02
Optical compensation films (positive C-plate) with disk anisotropic subunits (OASUs) that have high positive birefringence throughout the wavelength range 400 nm<λ<800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.