The cations 5Io6C1~+ and Ta6Cl~+ have related structures [1, 6] in which the metal ions are at the corners of an octahedron and the chlorine atoms are either above the faces of the octahedron a+(5 [oGCls) or above the edges (TaGCI~+). Discussions of the bonding...
‘In allowed thermal pericyclic reactions the number of (4q+2)sand (4r)acomponents must be odd.’ Let’s break it down: Acomponentis abond or orbitalthat takes part in the reaction asone unit. Both thedieneand thedienophileareeach one single component. We label the components by thetype...