Gold for the Generation and Control of Fluxional Barbaralyl Cations
作者:Paul R. McGonigal、Claudia de León、Yahui Wang、Anna Homs、César R. Solorio-Alvarado、Antonio M. Echavarren
DOI:10.1002/anie.201207682
日期:2012.12.21
comparison with the shape‐shifting barbaralylcation, which exists as a mixture of 181 400 degenerate forms. Gold‐catalyzed cycloisomerizations of 7‐alkynyl cyclohepta‐1,3,5‐trienes were found to proceed via fluxionalbarbaralyl intermediates (see scheme). The evolution of the intermediates into 1‐ or 2‐substituted indenes could be controlled by the choice of gold complex.
Shape-selective crystallisation of fluxional carbon cages
作者:Aisha N. Bismillah、Jiri Sturala、Brette M. Chapin、Dmitry S. Yufit、Paul Hodgkinson、Paul R. McGonigal
DOI:10.1039/c8sc04303e
日期:——
Dynamic covalent rearrangements of fluxional carbon cages, such as bullvalenes and barbaralanes, impart ‘shapeshifting’ molecular properties. Here, a series of five barbaralanes each interconvert dynamically between two constitutional isomers in solution, but resolve to single isomers upon crystallisation. Unexpectedly, the minor solution-phase isomers are resolved in two instances. Through dynamic