Draw the (pericyclic) reaction (reaction 1), including all mechanistic steps, that lead from the starting materials to the intermediate product. Show all isomers that can be formed and provide an explanation as to why that is. Determine the configuration of all chiral centers.

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.