Table : Scope of the Mallory photocyclisation with stoichiometric iodine. * Concentration of reaction diluted to (0.5 mM). **Solvent was a 1:1 Toluene:MeCN mixture. a Iwao et al. (1980). Preparation of hetero-stilbenes was achieved via a Wittig reaction between literature-known Wittig salts S5a and S5b and commercially available heteroaromatic aldehydes (see SI for more information). The resulting products are E/Z mixtures which we separated by column chromatography where possible. Ultimately, we observed no significant difference between the reactivity between the E and Z isomers under photochemical conditions and, due to rapid photoisomerization, both isomers can be used as substrates for the Mallory photocyclisation.