substitution even in the presence of strong electron‐donating groups and enables de‐tert‐butylation required for the complete annulation. Also demonstrated is the applicability of the method to introduce five‐, six‐, and seven‐membered rings containing oxygen, whereas multiple annulations also open up a short synthetic path to ladder‐type O‐heteroacenes and oligodibenzofurans.
Formation of dibenzofurans by flash vacuum pyrolysis of aryl 2-(allyloxy)benzoates and related reactions
作者:Michael Black、J. I. G. Cadogan、Hamish McNab
DOI:10.1039/c002480e
日期:——
Flashvacuumpyrolysis (FVP) of aryl 2-(allyloxy)benzoates 5 and of the corresponding aryl 2-(allylthio)benzoates 6 at 650 °C, gives dibenzofurans 19 and dibenzothiophenes 20, respectively. The mechanism involves generation of phenoxyl (or thiophenoxyl) radicals by homolysis of the O-allyl (or S-allyl) bond, followed by ipso attack at the ester group, loss of CO2 and cyclisation of the resulting aryl
Palladium-Catalyzed Cross-Coupling of Benzyl Ketones and<i>α,β</i>-Unsaturated Carbonyl and Phenolic Compounds with<i>o</i>-Dibromobenzenes to Produce Cyclic Products
A number of carbonyl and phenolic compounds efficiently couple with o-dibromobenzenes in the presence of a palladium catalyst and a base to give the corresponding oxygen-containing heterocycles or carbocyclic compounds. Thus, from the reactions of benzyl phenyl ketones, 1-naphthols, and α,β-unsaturated aldehydes and ketones, benzofuran, benzopyran, benzocyclobutane, and indene derivatives, respectively, are produced selectively via the successive formation of C–C and C–O bonds or of two C–C bonds.
NMR and DFT studies on persistent carbocations derived from benzo[<i>kl</i>
]xanthene, dibenzo[<i>d</i>
,<i>d</i>
′]benzo[1,2-<i>b</i>
:4,3-<i>b</i>
′]difuran, and dibenzo[<i>d</i>
,<i>d</i>
′]benzo[1,2-<i>b</i>
:4,5-<i>b</i>
′]difuran in superacidic media
carbocations generated by the protonation of hetero‐polycyclic aromaticcompounds with oxygen atom(s) were studied by experimental NMR and density function theory calculations. Benzo[kl]xanthene (1), dibenzo[d,d′]benzo[1,2‐b:4,3‐b′]difuran (2), and dibenzo[d,d′]benzo[1,2‐b:4,5‐b′]difuran (3) were synthesized by the annulation of arenediazonium salts. Compound 1 in FSO3H‐SbF5 (4:1)/SO2ClF and 3 in FSO3H‐SbF5 (1:1)/SO2ClF
通过实验NMR和密度函数理论计算研究了杂多环芳族化合物与氧原子质子化产生的持久碳阳离子。苯并[ kl ]吨蒽(1),二苯并[ d,d ']苯并[1,2- b:4,3- b ']二呋喃(2)和二苯并[ d,d ']苯并[1,2- b:4,5- b ']二呋喃(3)是通过芳构氮鎓盐的环化反应合成的。FSO 3 H-SbF 5(4:1)/ SO 2 ClF和3中的化合物1在FSO 3 H-的SbF 5(1:1)/ SO 2的ClF电离以1AH +与质子化在C(4)和四氢-3aH- +与质子化在C(6),以及这些阳离子被成功通过NMR在低温下观察到。密度泛函理论计算表明,1aH +和3aH +是最稳定的质子化碳正离子,2应当在C(6)质子化下电离为2aH +。根据在变化13个c。化学位移(Δδ 13 C)中,正电荷被离域到用于萘单元1AH+,为一个苯并[ b, d ]呋喃单元2AH +,并进入一个苯并[
[EN] DIBENZOXANTHENE COMPOUND, ORGANIC LIGHT-EMITTING DEVICE, DISPLAY, IMAGE INFORMATION PROCESSOR, AND IMAGE-FORMING APPARATUS<br/>[FR] COMPOSÉ DE DIBENZOXANTHÈNE, DISPOSITIF ÉLECTROLUMINESCENT ORGANIQUE, AFFICHAGE, PROCESSEUR DE DONNÉES D'IMAGES, ET APPAREIL FORMANT DES IMAGES
申请人:CANON KK
公开号:WO2014007186A1
公开(公告)日:2014-01-09
Provided is a novel compound having a high lowest triplet excited level (T1 level), a narrow bandgap, and a shallow highest occupied molecular orbital (HOMO) level. A dibenzoxanthene compound is represented by formula [1] described in Claim 1. In formula [1], R1 to R7 are each independently selected from the group consisting of hydrogen, alkyl groups, aryl groups, heterocyclic groups, aryloxy groups, alkoxy groups, amino groups, silyl groups, and cyano groups.