Preferred Label : electrocyclic reaction;
IUPAC definition : A molecular rearrangement that involves the formation of a σ-bond between the termini
of a fully conjugated linear π-electron system (or a linear fragment of a π-electron
system) and a decrease by one in the number of π-bonds, or the reverse of that process.
For example: The stereochemistry of such a process is termed 'conrotatory' or antarafacial
if the substituents at the interacting termini of the conjugated system both rotate
in the same sense, e.g. or 'disrotatory' (or suprafacial) if one terminus rotates
in a clockwise and the other in a counter-clockwise sense, e.g.;
Origin ID : E01948;
See also
A molecular rearrangement that involves the formation of a σ-bond between the termini
of a fully conjugated linear π-electron system (or a linear fragment of a π-electron
system) and a decrease by one in the number of π-bonds, or the reverse of that process.
For example: The stereochemistry of such a process is termed 'conrotatory' or antarafacial
if the substituents at the interacting termini of the conjugated system both rotate
in the same sense, e.g. or 'disrotatory' (or suprafacial) if one terminus rotates
in a clockwise and the other in a counter-clockwise sense, e.g.
