1. An alternative thermochemical reference system Introduction Alkanes as reference substances Compounds containing O, N, S, F, Cl, Br and/or I2. Hydrocarbons Alkanes Cycloalkanes Alkenes Monoolefines Cyclic mono-alkenes Di and polyolefines. Stabilization energy of butadiene Allenes Alkynes Aromatic hydrocarbons Stabilization energy of benzene Substituted benzene derivatives Polycyclic aromatic hydrocarbons3. The oxygen derivatives of hydrocarbons Alcohols Vinyl alcohol Phenols Ethers Cyclic ethers Stabilization energy of furan Peroxides Aldehydes and ketones Acetals and ketals Carboxylic acids Carboxylic acid esters Carboxylic acid anhydrides Ketene and carbon dioxide4. Organic compounds containing nitrogen Amines Azocycloalkanes Aromatic amines Carboxylic acid amides Hydrazine derivatives Nitriles Imines, oximes, hydroxylamines and azo compounds Heteroaromatic compounds Five member ring compounds. Stabilization energy of pyrrole Benzenoid heteroaromatic compounds Nitro compounds Organic nitrites and nitrates 5. Organosulfur compounds Thiols Organic sulfides Cyclic sulfides Stabilization energy of thiophene Thioaldehydes Carbothioic S-acids and esters Disulfides Sulfoxides, sulfones sulfites and sulfates6. Organohalides Halogens Alkyl halides Alkenyl halides Aryl halides Halogen derivatives of carboxylic acids and esters Carboxylic acid halides Carbonyl halides7. Radicals, cations, and anions Radicals Carbocations Carbanions Homolytic dissociation energies and relative enthalpies8. Inorganic compounds Elements Hydrogen compounds of the elements Carbon sulfides and oxides Sulfuric acid, sulfur oxides and halides Nitrogen compounds 9. Components of the heats of reactions 
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