= Benzaldehyde
<Benzaldehyde> is $\mathrm{C_6H_5CHO}$, an <aldehyde> whose carbonyl carbon is attached directly to a phenyl group. It combines aromatic-ring chemistry with reactions of an aldehyde carbonyl.
Addition of an appropriate <nucleophile> at the carbonyl carbon gives a new tetrahedral centre. Because benzaldehyde has no ordinary enolizable alpha carbon, its role in an <aldol reaction> commonly differs from that of an enolate-forming partner.
<Organic Chemistry by John McMurry>[Chapters19 and23: aldehyde addition and carbonyl condensation]{ref}
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