Photochemistry has tremendous applications in the synthetic organic chemistry. The photochemical behaviors
of compounds containing carbonyl chromophores are most widely and extensively investigated as these
elicit many types of photochemical reactions. Of these, the photochemical intramolecular H-abstraction reactions
are of great importance as these have been used as the suitable tools for the creation of the numerous synthetic and
natural exotic small to large ring carbo- and hetero-cyclic molecules. Furthermore, these H-abstraction reactions
are performed in clean and mild conditions without the involvement of precious and toxic reagents and construct a
route for the development of clean and green methods and are thus of immense utilities in the area of synthetic organic
chemistry. This article presents a survey of synthetic utilities as well as the functionalization of unactivated
carbon offered by the photochemical intramolecular H-abstraction in addition to our own work in the area.
Keywords: Photochemical approach, irradiation, H-abstraction, cyclization, functionalization.
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