routes have been developed to construct its skeleton. However, synthesis of unsymmetric phenanthrenes remains a challenge. Here, an efficient one-pot tandem reaction for the preparation of phenanthrenes via sequential γ-C(sp2)–H arylation, cationic cyclization, dehydration, and 1,2-migration was developed. A wide range of symmetric and unsymmetric phenanthrenes with diversified functional groups were synthesized
zirconacyclopentadienes (ZrPAHs). The efficiency of this process is demonstrated by a high‐yielding fivefold intramolecular coupling to form a helical ZrPAH with 16 fusedrings (from a precursor with no fusedrings). Several other PAH topologies are also reported. Protodemetalation of the ZrPAHs allowed full characterization (including by X‐ray crystallography) of PAHs containing one or more appended dienes with the
Nogaideli,A.I. et al., Journal of Organic Chemistry USSR (English Translation), 1968, vol. 4, p. 100 - 102
作者:Nogaideli,A.I. et al.
DOI:——
日期:——
Regioselectivity in the Scholl Reaction: Mono and Double [7]Helicenes
作者:Mohammad Mosharraf Hossain、Khushabu Thakur、Marat R. Talipov、Sergey V. Lindeman、Saber Mirzaei、Rajendra Rathore
DOI:10.1021/acs.orglett.1c01706
日期:2021.7.2
We employed the density functionaly theory (DFT)-predicted regioselectivity of the intramolecular Scholl reaction in phenanthrene and dibenzo[g,p]chrysene frameworks to obtain π-extended mono and double [7]helicenes, respectively. The formation of these helical structures occurs despite the buildup of a large strain energy up to 30 kcal/mol compared with their most stable isomers. The twisted and strained
我们采用了密度泛函理论 (DFT) 预测的菲和二苯并 [ g , p ] 骨架中分子内 Scholl 反应的区域选择性,分别获得了 π 扩展的单和双 [7] 螺旋。尽管与其最稳定的异构体相比,积累了高达 30 kcal/mol 的大应变能,但仍会形成这些螺旋结构。通过实验(核磁共振、紫外-可见光、发射、电化学和单晶 X 射线衍射)技术对扭曲和应变结构进行了表征和分析,并得到了 DFT 计算的进一步支持。