A quaternary carbon center is a carbon atom bonded to four other carbon atoms. These centers are particularly challenging to form because they lack a hydrogen atom, which is typically used in many chemical reactions. All-carbon quaternary centers can be found in various natural products and pharmaceuticals, making their synthesis of significant interest to synthetic chemists.
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(S)-4,5,5-trimethyl-4-(4-methylphenyl)-2-cyclopentenone
