Figure 37.
Cage 27 as a protective environment for guests. (a) Crystal structure of P4⊂27.165 (b) Extraction of P4 from 27 by n-heptane was not possible, whereas replacing P4 with benzene results in phosphorus release into the organic phase. (b) Reproduced with permission from ref (165). Copyright 2009 American Association for the Advancement of Science. (c) Schematic representation of a cage-controlled Diels–Alder reaction: encapsulation of furan by 27 prevented its reaction with maleimide. Addition of benzene released furan, triggering reaction.175