Isolation of a chiral anthracene cation radical: X-ray crystallography and computational interrogation of its racemization
作者:Maxim V. Ivanov、Khushabu Thakur、Anshul Bhatnagar、Rajendra Rathore
DOI:10.1039/c6cc10307c
日期:——
Chiral cation-radical salts hold significant promise as charge-transfer materials, chirooptical switches, and electron-transfer catalysts for enantioselective synthesis. Herein we demonstrate that the readily-available chiral 9,10-diphenyleanthracene derivative (i.e. SANT) forms a...
The titanium-induced coupling of 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one (3) gave 10,10′11,11′-tetrahydro-5,5′-bis(5H-dibenzo[a,d]cycloheptenyl)(5) and the chiral bridged diphenylanthracene (4), which was resolved and has a racemization barrier of ∼23 kcal/mol (1 cal = 4.184 J); the crystal structure of (4) has been determined.
钛诱导的10,11-dihydro-5 H -dibenzo [ a,d ] cyclohepten-5-one(3)的偶联反应得到10,10'11,11'-tetrahydro-5,5'-bis(5 H -二苯并[ a,d ]环庚烯基)(5)和手性桥联的二苯基蒽(4),其被拆分并且具有〜23 kcal / mol的消旋化势垒(1 cal = 4.184 J);已经确定了(4)的晶体结构。
Static and dynamic stereochemistry of a chiral, doubly bridged 9,10-diphenylanthracene from a stereospecific polycyclic aromatic dicarbonyl coupling
pentagons and heptagons remain rare. In this paper, we report dicyclohepta[ijkl,uvwx]rubicene (DHR), a non-benzenoid isomer of dibenzo[bc,kl]coronene with two pentagons and two heptagons. We developed an efficient and scalable synthetic method for DHR by using Scholl reaction and dehydrogenation. Crystalstructure of DHR shows that the benzenoid rings, two pentagons and two heptagons are coplanar.