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25.6.6.4.2 Variation 2: Formylation in Solvent-Free Conditions Using Microwaves

DOI: 10.1055/sos-SD-025-00443

Schall, A.; Reiser, O.Science of Synthesis, (200725619.

After formation of the VilsmeierHaack reagent (iminium salt 11) at 05°C, the actual formylation of the arene requires heating and reaction times of several hours. Consequently, an important improvement was discovered when dielectric heating by microwave irradiation was used in this process, resulting in significantly reduced reaction times and generally higher yields of the arenecarbaldehydes 14 (Table 9).[‌80‌] Moreover, by grafting the substrates and reagents onto silica gel no solvents are necessary, making this variation attractive also from an ecological point of view.

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