title: Synthesis for the mesomer and racemate of thiophene-based double helicene under irradiation.
abstract: In this work, the racemate and mesomer of the thiophene-based naphthalene-cored double helicenes (1) were obtained efficiently by one-pot photocyclization of 1,1,2,2-tetrakis(dithieno[2,3-b:3',2'-d]thiophen-2-yl)ethene in the presence of iodine in dry benzene. The structure of meso-1a was confirmed by single crystal X-ray analysis. The chiral resolution of the racemate was carried out by chiral HPLC, and the chiral properties, such as CD spectra, optical rotations, and half-life of enantiomers were characterized.
authors.affiliation: Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004, China.
authors.forename: Xinming
authors.initials: X
authors.lastname: Liu
authors.forename: Panpan
authors.initials: P
authors.lastname: Yu
authors.forename: Li
authors.initials: L
authors.lastname: Xu
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Yang
authors.forename: Jianwu
authors.initials: J
authors.lastname: Shi
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Wang
authors.forename: Yanxiang
authors.initials: Y
authors.lastname: Cheng
authors.forename: Hua
authors.initials: H
authors.lastname: Wang