Gondysia preceeded Neadysgonia (Lepidoptera, Erebidae, Erebinae), a new generic synonymy from Southeastern United...

Overview

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.