Heavy analogs of carbenium ions: Si-, Ge-, An- and Pb-centered cations
Heavy analogs of organic free radicals: Si-, Ge-, Sn-, and Pb-centered radicals
Heavy analogs of carbanions: Si-, Ge-, Sn- and Pb-centered anions
Heavy analogs of carbenes: silylenes, germylenes, stannylenes and plumbylenes
Heavy analogs of alkenes, 1,3-dienes, allenes and alkynes: multiply bonded derivatives of Si, Ge, Sn and Pb
Heavy analogs of aromatic compounds.