@article{643a766a62474c62b70dce750a9c9112,
title = "Room-Temperature Ring-Opening Polymerization of δ-Valerolactone and ϵ-Caprolactone Caused by Uptake into Porous Pillar[5]arene Crystals",
abstract = "Confined space provides a reaction platform with altered reaction rate and selectivity compared with a homogeneous solution. In this work, porous phenolic pillar[5]arene crystals were used as a reaction space to promote and perturb equilibrium between lactones and their corresponding polyesters. Immersion of porous pillar[5]arene crystals in liquid lactones induced ring-opening polymerization of δ-valerolactone and ϵ-caprolactone at room temperature because the phenolic hydroxy groups have catalytic activity via hydrogen bonds and the pillar[5]arene cavities prefer linear guests. After the reaction, pillar[5]arene and polyesters formed pseudo-polyrotaxanes.",
keywords = "Crystals, Host–Guest Systems, Macrocycles, Pillar[n]Arenes, Polymerization",
author = "Kenichi Kato and Koki Maeda and Motohiro Mizuno and Yuta Nishina and Shixin Fa and Shunsuke Ohtani and Tomoki Ogoshi",
note = "Funding Information: This work was supported by JSPS KAKENHI Grant Numbers JP20K22528 (Research Activity Start‐up, K.K.), JP21K14611 (Early‐Career Scientists, K.K.), JP21K14612 (Early‐Career Scientists, S.F.), JP21K20533 (Research Activity Start‐up, S.O.), JP18H04510, and JP20H04670 (Scientific Research on Innovative Areas, T.O.), JP20H04666 (Scientific Research on Innovative Areas, M.M.), JP19H00909 and JP22H00334 (Scientific Research (A), T.O.), Nagase Science and Technology Foundation (T.O.) and JST CREST Grant Number JPMJCR18R3 (T.O. and Y.N.), and MEXT World Premier International Research Center Initiative (WPI), Japan. The authors thank Dr. Masayuki Gon and Prof. Dr. Kazuo Tanaka (Kyoto University) for IR spectroscopy, Dr. Takeshi Yamamoto and Prof. Dr. Michinori Suginome (Kyoto University) for PXRD measurement, and Mr. Keita Miyagawa (Okayama University) for investigation on the ring‐opening polymerization. Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",
year = "2022",
doi = "10.1002/anie.202212874",
language = "English",
journal = "Angewandte Chemie - International Edition",
issn = "1433-7851",
publisher = "John Wiley and Sons Ltd",
}