Less is more? Probing the template amount required for solid-state olefin [2 + 2] photocycloaddition in a ball mill.

The first template-assisted olefin [2 + 2] photocycloaddition performed in a ball mill is reported. Using catalytic amounts of template resorcinol (as low as 10 mol%) enables rapid, quantitative and stereoselective dimerisation of trans-1,2-bis(4-pyr…

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