A ligand/base/metal oxidant free Pd‐catalyzed C(sp 2 )–H activation, followed by isocyanide insertion to synthesize indolizine/imidazoline fused heterocyclics in PEG‐400 as a recyclable solvent. The present transformation is greener and an efficient strategy using oxygen as external oxidant. The spectroscopic properties of selected indolizine/imidazoline fused heterocyclics were studied by UV−visible and fluorescence spectroscopy.
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Kumar et al. (2018) studied this question.
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