. 2018 Sep 24;23(10):2442. doi: 10.3390/molecules23102442
© 2018 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Scheme 53.
Cobalt-catalyzed [2 + 2 + 2]-cycloaddition.