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ABSTRACT The crystal structure of a cyclic tetramer from racemic 6,8-dioxabicyclo[3.2.1]octan-7-one was determined. The tetramer crystallized with 1.5 CH3CN solvate per molecule in a

monoclinic space group C2/_c_, with _a_=44.53(3), _b_=5.997(2), _c_=22.562(9) Å, β=108.41(3)°; _Dc_=1.338, _Dm_=1.34g/cm3, _Z_=8. The final _R_ was 0.099 for 3120 observed data

(|_Fo_|≥3σ(_Fo_)). Contrary to the expectation of a meso compound having an inversion center or a 4 axis within the molecule, this tetramer was found to be a racemic mixture of a pair of

optically active enantiomers. The molecule showed an approximate four-fold symmetry with a roughly square 20-membered ring. The tetramer formed inclusion complex with an acetonitrile

molecule accommodated in its central cavity by dipole-dipole interaction. Another acetonitrile molecule was found on the crystallographic two-fold axis surrounded by six tetramer molecules.

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STEREOCOMPLEX IN A CRYSTAL Article Open access 05 August 2024 ARTICLE PDF REFERENCES * M. Okada, H. Sumitomo, and Y. Yamamoto, _Makromol. Chem._, 175, 3023 (1974). * M. Okada, H. Sumitomo,

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Neupert-Laves and M. Dobler, _Helv. Chim. Acta_, 59, 614 (1976). Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Applied Chemistry, Faculty of Engineering,

Nagoya University, Mikio Imaeda, Isao Tanaka & Tamaichi Ashida * Faculty of Agriculture, Nagoya University, Ichiro Tajima, Masahiko Okada & Hiroshi Sumitomo Authors * Mikio Imaeda

View author publications You can also search for this author inPubMed Google Scholar * Isao Tanaka View author publications You can also search for this author inPubMed Google Scholar *

Tamaichi Ashida View author publications You can also search for this author inPubMed Google Scholar * Ichiro Tajima View author publications You can also search for this author inPubMed 

Google Scholar * Masahiko Okada View author publications You can also search for this author inPubMed Google Scholar * Hiroshi Sumitomo View author publications You can also search for this

author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Imaeda, M., Tanaka, I., Ashida, T. _et al._ Crystal Structures of the

Cyclic Oligoesters from 6,8-Dioxabicyclo[3.2.1]octan-7-one. II. The Optically Inactive Cyclic Tetramer. _Polym J_ 14, 197–203 (1982). https://doi.org/10.1295/polymj.14.197 Download citation

* Issue Date: 01 March 1982 * DOI: https://doi.org/10.1295/polymj.14.197 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link

Sorry, a shareable link is not currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative KEYWORDS * Crystal Structure *

Cyclic Oligoester * 6,8-Dioxa-bicyclo[3.2.1]octan-7-one Cyclic Oligomer * Inclusion Complex