On Kekulé’s insight Giuseppe Iurato E-mail:
[email protected] Abstract. In this paper, we would like to retake a historical controversy on the alleged discovery of Kekulé’s Benzene structure formula from other possible epistemological viewpoints which might perhaps put into a more right historical perspective this apparent and unmotivated riddle, also with the aid of some elementary psychoanalytic considerations. Moreover, one of the purposes of this paper is also that of understanding some possible, general aspects underlying a creative process. 1. Introduction This paper is centered on the vexata quæstio concerning the so-called Kekulé’s insight, namely, the alleged question inherent the discovery of the Benzene structure1. The Benzene, as chemical substance, was isolated by Michael Faraday in 1825 and the qualitative chemical analysis detected only carbon and hydrogen in it, so that its empirical formula is CH. Subsequent repeated analyses and molecular weight determinations2 (mainly made by Eilhard Mitscherlich in 1834) have determined to be C6H6 its molecular formula. The chemical properties of this substance show a high unsaturation degree (due to its low hydrogen-carbon ratio equal to 1:1) but it is no subject to those typical chemical reactions which characterize the other already known organic compounds, whence it follows that such a substance did should fall into another, new class of organic compounds: indeed, it will be the simplest chemical substance of the so-called aromatic compounds class. Thereafter, one of the main theoretical task was to determine, according to the new Dalton’s atomic theory, the possible geometrical configurations related to the disposition of the carbon and hydrogen atoms.