Double-twist Mobius aromaticity in a 4n + 2 electron electrocyclic reaction

摘要

One transition state for the 10 electron (4n + 2) electrocyclisa-tion of Z,E,Z-decapentaene is predicted to have the properties of a double-twist Mobius strip,with delocalised bond lengths and the NICS(0) magnetic index typical of aromaticity;a 5,6-di-~tBu substituted decapentaene is predicted to react in this mode in preference to the competitive six-electron electrocyclisation.