Abstract
We report a photochemical reaction system which requires activation by two colors of light. Specifically, a dual wavelength gated system is established by fusing the visible light mediated deprotection of a dithioacetal with the UV light activated Diels–Alder reaction of an o‐methylbenzaldehyde with n‐ethylmaleimide. Critically, both light sources are required to achieve the Diels–Alder adduct, irradiation with visible or UV light alone does not lead to the target product. The introduced dual gated photochemical system is particularly interesting for application in light driven 3D printing, where two color wavelength activated photoresists may become reality.
Highlights
We report a photochemical reaction system which requires activation by two colors of light
One of the reaction components must absorb an incident photon to induce a photochemical reaction. Photochemical ligations, such as the [2+2]-cycloaddition of styrylpyrene moieties[3] or the light-induced Diels–Alder cycloaddition of o-methylbenzaldehydes with electron-deficient dienophiles,[4] require one reaction partner to be activated to an excited state from which the
In order to expand the applicability of photochemical reactions, the combination of two distinct light sources, each activating different species, enables an advanced level of reaction control
Summary
We report a photochemical reaction system which requires activation by two colors of light. Photochemical ligations, such as the [2+2]-cycloaddition of styrylpyrene moieties[3] or the light-induced Diels–Alder cycloaddition of o-methylbenzaldehydes (oMBAs) with electron-deficient dienophiles,[4] require one reaction partner to be activated to an excited state from which the
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