Théorie

Premier Mémoire sur les Types Chimiques; Par M. J. Dumas. Second Mémoire sur les Types Chimiques; par MM. J. Dumas et J.-S. Stas.

1840 · 45032 — Paris Fortin Masson et Cie 1840. 8vo. Without wrappers. Extracted from 'Annales de Chimie et de Physique' 2e Series tome 73. Pp. 73-103 incl. Note de Liebig pp. 100-103 and pp. 113-166. Some scattered brownspots. <br/><br/><em>This paper which was published at the same year in "Comptes Rendues" 3 Fevrier is the most importent on the theory of structural types and the nomenclature of organic compounds refuting the electrochemical theory of Berzelius. "The development of this idea type organique into what is sometimes called the "Older Type Theory" as distinguished from Gerhardt's Type heory is contained in Dumas' importent memoir on the substitution and the theory of types presented on 3 febriary 1840."Partington IV p. 365. In the second paper Stas and Dumas record the first use of 'potash-lime' the precursor of soda-lime an invaluable reagent in organic chemistry."Jean Baptiste Dumas advances a theory that the chemical properties of an organic compound are determined by its structure and not as seems to be the case with inorganic compounds by its electrical properties. he illustrates the concept with the example that the basic qualitative properties of acetic acid are retained even after replacing three fourths of the hydrogen by chlorine. As a consequence he calls for a revision of chemical nomenclature for organic compounds basing terms on common features not on elemental composition."Parkinson "Breakthroughs" 1840 C. </em> unknown