Search Method for Formula Search

  • The arrangement is based on the general formula "CxHyElementz" where the symbol of elements is alphabetical.
  • Inorganics precede carbon-containing compounds. Inorganics with no-carbon are arranged alphabetically.

    ex. Cl3, BF3, D2O, HBr, HCl, H4N2 (Hydrazine), H3NO (Hydroxylamine)

  • Organics with no hydrogen such as CCl4 are listed before any CH.
  • Salts of acids are indexed under the formulas of the free acids.

    ex. CH3CH2COONa (Propionic Acid Sodium Salt) ..... C3H6O2

  • Salts of amines, except onium and diazonium salts are indexed under the formulas of the free amines.

    ex. CH3NH2・HCl (Methylamine Hydrochloride) → CH5N
    (CH3)4NCl (Tetramethylammonium Chloride) → C4H12ClN
    [(C6H5)3AsCH3] I (Methyltriphenylarsonium Iodide) → C19H18AsI
    [(C6H5)3PCH3] I (Methyltriphenylphosphonium Iodide) → C19H18IP
    NO2C6H4N:N・BF4 (4-Nitrobenzenediazonium Tetrafluoroborate) → C6H4BF4N3O2

  • Water of crystallization is omitted from the formula, so index by the formula of anhydrous.

    ex. HOOCCH2CH2CH(NH2)COOH・H2O (DL-Glutamic Acid) → C5H9NO4
    HOC6H4CH(OH)COOH・xH2O (DL-Hydroxymandelic Acid) → C8H8O4


- Besides above index method, please index by the molecular formula. -