title: Aromatic Dicupra[10]annulenes.
abstract: Metal-containing aromatic systems (metalla-aromatics) are unique and important both experimentally and theoretically. Among metalla-aromatics, six-membered metallabenzenes and metallabenzynes have attracted much attention in recent years. However, reports on their superior homologues are rare. In this work, the first series of aromatic dicupra[10]annulenes were isolated from the reaction of dilithio reagents and copper salts. Single-crystal X-ray structural analysis revealed dicupra[10]annulenes with averaged bond lengths. (7)Li NMR spectra and theoretical calculations revealed considerable aromatic character. XPS data suggested that the oxidation state of Cu atom in dicupra[10]annulenes was more likely to be Cu(I), indicating that the dilithio moieties in dicupra[10]annulenes participated as noninnocent ligands. This work demonstrates a novel approach to construct macrocyclic metalla-aromatics.
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.|State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 200032, China.
authors.forename: Junnian
authors.initials: J
authors.lastname: Wei
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.|State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 200032, China.
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.|State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 200032, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Chi
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.|State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 200032, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.|State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 200032, China.
authors.forename: Wen-Xiong
authors.initials: WX
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.|State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 200032, China.
authors.forename: Zhenfeng
authors.initials: Z
authors.lastname: Xi