title: High-pressure NMR study of cis-1,n-disubstituted[n]paracyclophanes. Effect of increased pressure on the hindered internal rotation.
abstract: The effect of hydrostatic pressure on the rate of internal rotation of title compounds has been examined by the DNMR method. Quartz pressure-resisting NMR cells were used to realize the high-pressure experiments up to 390 (line shape measurements) and 450 MPa (chemical shift measurements). Application of hydrostatic pressure was found to accelerate the rotation of the benzene ring, while pressure-induced low-frequency chemical shifts of bridge methylene protons indicated that there is a considerable shrinkage of the methylene bridge structure upon pressurization.
authors.affiliation: Contribution from the Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan. shichijo@biol.kobe-u.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Yamada
authors.forename: S
authors.initials: S
authors.lastname: Yonehara
authors.forename: S
authors.initials: S
authors.lastname: Tanaka
authors.forename: F
authors.initials: F
authors.lastname: Muro
authors.forename: A
authors.initials: A
authors.lastname: Watanabe
authors.forename: K
authors.initials: K
authors.lastname: Nishikawa