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.
Palladium-Catalyzed Double Annulations To Construct Multisubstituted Benzodifurans
作者:Zhiqiang Liang、Shengming Ma、Jihong Yu、Ruren Xu
DOI:10.1021/jo7016263
日期:2007.11.1
Efficient synthetic routes to construct multisubstituted benzo[1,2-b:5,4-b‘]difurans and benzo[1,2-b:4,5-b‘]difurans from bis(allyloxy)bis(alkynyl)benzenes or bis(alkynyl)dihydroxybenzenes and allylic halides utilizing palladium-catalyzed double annulations is reported. By further applying a double ring-closing metathesis reaction, pentacyclic compounds were also prepared.
有效的合成路线来构建多取代苯并[1,2- b:5,4- b “] difurans和苯并[1,2- b:4,5- b ”]由二difurans(烯丙氧基)双(炔基)苯或据报道,利用钯催化的双环双(炔基)二羟基苯和烯丙基卤化物。通过进一步进行双闭环复分解反应,还制备了五环化合物。
A novel heterocyclic compound is provided. In particular, a novel heterocyclic compound which can improve the element characteristics of the light-emitting element is provided. The heterocyclic compound is represented by a general formula (G1)
DBqAr1nAr2-A (G1)
in which a substituted or unsubstituted dibenzo[f,h]quinoxalinyl group and a substituted or unsubstituted benzobisbenzofuranyl group are bonded to each other via a substituted or unsubstituted arylene group. In the general formula (G1), DBq represents a substituted or unsubstituted dibenzo[f,h]quinoxalinyl group, Ar1 represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, n represents 0 or 1, Ar2 represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, and A represents a substituted or unsubstituted benzobisbenzofuranyl group. When the arylene group represented by Ar1 and Ar2 has substituents, the substituents may be bonded to each other to form a ring.
A compound including a first ligand L
A
of Formula I
is disclosed. In the structure of Formula I, one of L
1
and L
2
is C, and the other is N; Y
1
to Y
14
are each C or N; at least two adjacent Y
7
, Y
8
, Y
9
, and Y
10
are carbon atoms that are fused to a structure of Formula II
Z
1
and Z
2
are each O, S, Se, NR, CRR′, or SiRR′; and each R, R′, R
A
, R
B
, R
C
, and R
D
is hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L
A
is complexed to a metal M by L
1
and L
2
, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.
An organic electroluminescence device sequentially includes an anode, an emitting layer, an electron-transporting region, and a cathode, the electron-transporting region including an electron-transporting material that includes a cyano group and an aromatic ring group.