Diazonium compounds are standard reagents used in synthesis of organic compounds, especially aryl derivatives. Hydrogenation is a useful means for converting unsaturated compounds into saturated derivatives. The product contains significant amounts of chlorinated benzoic acid derivatives. A variety of derivatives and analogues are known. Polyphosphates arise by polymerization of phosphoric acid derivatives. One such class is the oxidized fatty acid derivatives called oxylipins. Decomposition of mixtures of mono- and heterometallic alkoxide derivatives has also been examined. Typical dyes are triarylmethanes consisting of ortho-hydroxylbenzoic acid derivatives. This is the usual way that derivatives and bonds are traded. It also prevented further regulation of risky financial derivatives. Homopolymer polyamides derived from pairs of diamines and diacids (or diacid derivatives). They are analogous to partial derivatives in several variables. The resulting sodium derivatives can be alkylated. The resonance proposal also helped explain the number of isomers of benzene derivatives. Functionals are often expressed as definite integrals involving functions and their derivatives.