CHIRALS IN BOXES. “The capsule remains achiral, but the remaining space is chiral, and coencapsulated molecules respond in an amplified way. We probe the various regions of the capsule with guests of different shape. Primary acetylenes, the narrowest of functional groups, can access the tapered ends of the capsule that exclude functions as small as methyl groups.”
https://www.ncbi.nlm.nih.gov/pubmed/19603810
