One-pot synthesis of quaternary carbon centered cyclobutanes via Pd( ii )-catalyzed cascade C(sp 3 )–H activations

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A novel approach toward quaternary carbon centered cyclobutanes through Pd( ii )-catalyzed sequential intramolecular methylene C–H alkylation and intermolecular methine C–H bond arylation, alkenylation, alkylation, alkynylation, allylation, benzylation or alkoxylation is described.