Quaternary carbon

[2] The formation of chiral quaternary carbon centers has been a synthetic challenge.

to construct asymmetric quaternary carbon atoms.

One of the most industrially important compounds containing a quaternary carbon is bis-phenol A (BPA).

The central atom is a quaternary carbon.

Retrosynthetically, that carbon is the central atom of an acetone molecule before condensation with two equivalents of phenol - BPA Production Process