Abstract
The formation of dimers and cycloaddition products upon irradiation of compounds containing olefinic bonds constitutes one of the first types of photochemical reactions observed. Early workers were dependent mainly upon irradiation in sunlight, often for periods of several months (varying as to the season) to obtain small yields of products. Laborious separation and purification often led to the elucidation of the gross structure of these products, but since the excellent physical tools commonly available to the present-day photochemist were lacking, the stereochemistry of the products often remained completely obscure. A review of the reactions discovered and investigated prior to the rapid acceleration in photochemical progress of the past twenty years is given by Mustafa.(1)
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