Electrocyclic Reaction Lab Report

CHAPTER I
Introduction and Background: An electrocyclic reaction is the coordinated cyclization of a conjugated π-electron framework by changing over one π-bond to a ring shaping σ-bond. The reverse reaction might be called electrocyclic ring opening. An electrocyclic reaction is characterized as the thermal or photochemical transformation of an acyclic conjugated framework into a ring framework by arrangement of an σ bond between the closures of the conjugated framework in a deliberate procedure, or the reverse of this reaction. These reactions are reversible in nature. In organic chemistry, an electrocyclic reaction is a sort of pericyclic rearrangement where the net outcome is one pi bond being changed over into one sigma bond or the other way around (Dinda, 2017). These reactions are typically ordered by the accompanying criteria:
 Reactions can be either photochemical or thermal.
 Reactions can be either ring-opening or ring-shutting (electrocyclization).
 Contingent upon the sort of reaction (photochemical or thermal) and the quantity of pi electrons, the reaction can occur through either a conrotatory or disrotatory instrument (Dinda, 2017).
 The sort of

A disrotatory ring closure is symmetry allowed because like phases of the p orbitals overlap to frame the new σ bond of the ring. In the disrotatory ring closure, both methyl groups are pushed down (or up), making them cis in the product” (Singh, 2005). This is a particular example of the general procedure watched for conjugated polyenes with an odd number of π bonds. The HOMO of a conjugated polyene with an odd number of π bonds has like phases of the peripheral p orbitals on the same side of the molecule. Accordingly thermal electrocyclic reactions happen in a disrotatory fashion for a conjugated polyene with an odd number of π