Publications with shared reference: Building Heterocyclic Systems with RC(OR)<sub>2</sub><sup>+</sup> Carbocations in Recyclable Brønsted Acidic Ionic Liquids: Facile Synthesis of 1‐Substituted 1<i>H</i>‐1,2,3,4‐Tetrazoles, Benzazoles and Other Ring Systems with CH(OEt)<sub>3</sub> and EtC(OEt)<sub>3</sub> in [EtNH<sub>3</sub>][NO<sub>3</sub>] and [PMIM(SO<sub>3</sub>H)][OTf]