Acetals: Hal/X and O/O, S, Se, Te

Chlorine, Bromine, and Iodine

Aldehydes

Ene-X Compounds (X=S, Se, Te, N, P)

Acetals: O/N, S/S, S/N, and N/N and Higher Heteroatom Analogues

Three Carbon-Heteroatom Bonds: Esters, and Lactones; Peroxy Acids and R(CO)OX Compounds; R(CO)X, X=S, Se, Te

Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts

Quinones and Heteroatom Analogues

Three Carbon-Heteroatom Bonds: Ketenes and Derivatives

Three Carbon-Heteroatom Bonds: Ketene Acetals and Yne-X Compounds