ChemInform Abstract: Regio‐Controlled Synthesis of 1,4‐Benzothiazinones.

Abstract

Regio-Controlled Synthesis of 1,4-Benzothiazinones. -Reaction of 2-aminothiophenol with epoxides (II) in refluxing MeCN gives regioselectivity 2-arylbenzothiazin-3-ones (III). The regioselectivity of the reaction can be reversed by reaction of 2-aminothiophenol hydrochloride with epoxides (II) [→(V)]. -(GHAILANE, T.; SAADOUNI, M.; BOUKHRIS, S.; HABBADI, N.; HASSIKOU, A.; KERBAL, A.; GARRIGUES, B.; SOUIZI*, A.; Heterocycles 83 (2011) 2, 357-363, http://dx.

Experimental and Theoretical Studies for Mild Steel Corrosion Inhibition in 1.0 M HCl by Two Stereoisomers of Benzothiazinone Derivatives

“…Constant phase elements have been widely used to account for deviations brought about by surface roughness [30][31]. CPE impedance is given by the following equation: (10) where Q is the constant phase element (CPE), ω is the sine wave modulation angular frequency (in rad s -1 ), j 2 = -1 is the imaginary number and n is the CPE exponent. According to n value, CPE can be resistance [ZCPE = R, n = 0], pure capacity [ZCPE = C, n = 1], inductance [ZCPE = L, n = -1] or Warburg impedance (n = 0.5) [32].…”

“…Most of these inhibitors contain nitrogen, sulphur and/or oxygen atoms, which may be adsorbed onto the metallic surface and block the active sites [7][8][9]. In addition, in our previous study [10], the inhibition efficiency of benzothiazinone derivatives, 2-aryl-benzothiazin-3-one with aryl = Ph-Cl, and 3-aryl-benzothiazin-2-one with aryl = Ph-CH3, on mild steel corrosion in acidic environments, was studied, and the results showed good agreement between experiments and theory. The aim of this work was to study the inhibition efficiency of two new organic compounds, namely 2-phenyl-benzothiazine-3-one (BHT1) and 3-phenylbenzothiazine-2-one (BHT2), synthesized and characterized by Souizi et al [11], on the mild steel corrosion in 1.0 M HCl, using experimental and theoretical methods.…”