已建议对二苯并噻吩S-氧化物(DBTO)进行光诱导的脱氧以释放原子氧[O(3 P)]。为了扩大可以使用O(3 P)的条件和应用,需要在更长的波长下生成O(3 P)。亚砜类苯并[ b ]萘-[1,2,d ]噻吩S-氧化物,苯并[ b ]萘并[2,1,d ]噻吩S-氧化物,苯并[ b ]噻吩[9,10- d ]噻吩S-氧化物,二萘并[2,1- b:1',2'- d ]噻吩S氧化物和二萘并[1,2- b:2',1'- d ]噻吩S-氧化物都比DBTO吸收更长波长的光。确定这些亚砜是否可用于产生O(3P),量子产率研究,产物研究和计算分析。与DBTO相比,这些亚砜的脱氧量子产率高出3倍。然而,与DBTO相比,这些亚砜对溶剂的氧化导致氧化产物的比率不同,这表明脱氧机理发生了变化。密度泛函计算表明,与DBTO相比,较大的亚砜具有更大的单重态-三重态间隙。由此得出结论,所检查的亚砜可能通过两种不同的机制进行脱氧。
Triphenylene-Benzofuran/Benzothiophene/Benzoselenophene Compounds With Substituents Joining To Form Fused Rings
申请人:Ma Bin
公开号:US20110266526A1
公开(公告)日:2011-11-03
Compounds comprising a triphenylene moiety and a benzo- or dibenzo-moiety are provided. In particular, the benzo- or dibenzo-moiety has a fused substituent. These compounds may be used in organic light emitting devices, particularly in combination with yellow, orange and red emitters, to provide devices with improved properties.
We report here a two-in-one strategy for the Pd(II)-catalyzed tandem C–H arylation/decarboxylative annulation between readily available cyclic diaryliodoniumsalts and benzoic acids. The carboxylic acid functionality can be used as both a directing group for the ortho-C–H arylation and the reactive group for the tandem decarboxylative annulation. By a step-economical double cross-coupling annulation
Pd-catalyzed C-H annulation reactions of halo- and aryl-heteroarenes were developed using readily available o-bromobiaryls and o-dibromoaryls, respectively. A variety of five-membered heteroarenes rapidly provided the corresponding phenanthrene-fused heteroarenes, which led to the identification of phenanthro-pyrazole and thiazole as new, stable -2 V redox couples. The flexible syntheses and tunability
A novel ligand-freePd-catalyzed cascade reaction between o-chlorobenzoic acids and cyclic diaryliodonium salts is reported. This one-pot procedure involves a carboxylic acid directed o-arylation followed by intramolecular decarboxylative annulation affording various valuable triphenylenes, which can be further transformed into diversified building blocks for material chemistry. For the first time
Annulative π-extension (APEX) reactions of heteroarenes are described herein. A catalytic system comprising a cationic palladium species and o-chloranil using dimethyldibenzosiloles as π-extending agents enabled the extension of the π-system of benzo[b]thiophenes. π-Extended dibenzofurans and carbazoles could also be obtained from benzofuran and N-tosylindole, respectively, with dimethyldibenzogermole
本文描述了杂芳烃的环状π-延伸(APEX)反应。使用二甲基二苯并甲硅烷作为π扩展剂的包含阳离子钯物种和邻氯甲腈的催化体系使苯并[ b ]噻吩的π系统得以扩展。π-扩展的二苯并呋喃和咔唑也可以分别从二甲基呋喃和锗的π-扩展剂分别从苯并呋喃和N-甲苯磺酰基吲哚得到。机理研究表明,两种可能的反应途径涉及基于碳链的苯并噻吩的双CH芳基化反应或正式的环加成/氧化级联反应。