@article{01b140e2eed84aa0984f406c732f5bb2,
title = "Synthesis of oxa[9]helicene derivatives by cyclodehydration of 1,1′-bibenzo[c]phenanthrene-2,2′-diol using phosphorus pentoxide",
abstract = "A new one-step cyclization reaction has been established for the synthesis of oxa[9]helicene derivatives, containing eight ortho-condensed benzene rings and one furan ring. 1,1′-Bibenzo[c]phenanthrene-2,2′-diols (HEBPOLs) afforded the corresponding oxa[9]helicenes by refluxing with phosphorous pentoxide (P2O5) in o-dichlorobenzene. Enantiomerically pure oxa[9]helicenes were also synthesized with retention of the configuration and enantiopurity (>98% ee) from the corresponding enantiomerically pure HEBPOLs.",
author = "Hossain, {Md Sharif} and Mahmuda Akter and Michinori Karikomi",
note = "Funding Information: We would like to express our appreciation for the assistance provided by Mr. Makoto Roppongi at Utsunomiya University, Research and Development Collaborative Research Center in terms of analysis and equipment. This work was supported by a grant from Takahashi Industrial and Economic Research Foundation, Japan . Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",
year = "2021",
month = apr,
day = "13",
doi = "10.1016/j.tetlet.2021.152948",
language = "English",
volume = "69",
journal = "Tetrahedron Letters",
issn = "0040-4039",
publisher = "Elsevier Limited",
}