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Acid catalysed condensation of resorcinol and pyrogallol with aromatic aldehydes using a microfluidic vortex fluidic device (VFD) under continuous flow conditions results in the selective formation of resorcin[4]arenes and pyrogallol[4]arenes as predominantly their C4v isomers. Notably C2v isomers and C2h isomers can be also prepared with the latter being converted to the C4v isomer when the VFD operates in confined mode.

Graphical abstract: Stereospecific synthesis of resorcin[4]arenes and pyrogallol[4]arenes in dynamic thin films

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