Corrigendum to “Experimental study on the thermochemistry of 1-(2H)-phthalazinone and phthalhydrazide” [J. Chem. Thermodyn. 40 (2008) 829–835]

Thermochemical study of four isomers of dichloroanisole

“…Therefore, one can conclude that the Cox scheme is a good method for the estimation of values of D f H m ðgÞ for the dichloroanisole isomers, which has also been observed in the case of the monochloroanisole isomers [4]. Hence, for the 2,5-and 3,4-dichloroanisole isomers, for which there are not available experimental values of D f H m ðgÞ, it is possible to estimate these parameters, using the literature values of D f H m ðgÞ for para-dichlorobenzene, D f H m ðgÞ ¼ ð22:5 AE 1:5Þ kJ Á mol À1 [49], and the ones reported above for ortho-dichlorobenzene, anisole and benzene, having good confidence on the estimated …”

“…In the case of the monochloroanisole isomers [4], it was found that the substitution of a chlorine atom in the metaposition in the anisole ring creates a higher effect of stabilization than in the ortho-or para-position, with a less enthalpic effect of stabilization in the ortho-position possibly due to steric repulsions between the -OCH 3 group and the chlorine atom. So, according to this, it is not surprising to find the 3,5-dichloroanisole as the most stable of the four studied dichloroanisole isomers, not only due to the two chlorine atoms being substituted in meta-position, but also because all the substituents are not attached to adjacent carbon atoms of the aromatic ring, hence eliminating possible steric repulsions.…”

“…The result obtained for the massic energy of combustion of 4-chlorobenzoic acid, at T = 298.15 K, for the reaction with HCl Á 600 H 2 O(l) as the sole chlorine-containing product in the final state, was D c u = À(19,568.6 ± 2.4) [4], which is in very good agreement with the recommended value [33], D c u = À(19,566.4 ± 1.5) J Á g À1 .…”

“…To provide new thermochemical data for this class of compounds, and as a part of an extensive and systematic study of the thermochemistry of halogenated aromatic compounds by our Research Group [2][3][4][5][6][7], this paper presents a complete experimental study of the thermochemistry of four isomers of dichloroanisole.…”

Energetics of thiophenecarboxaldehydes and some of its alkyl derivatives

“…Thermochemical data, more specifically enthalpies of formation in the gaseous state, are important to establish correlations between structure, energetic and reactivity, for the better understanding of the properties of molecules. As part of our interest on the thermochemistry of sulphur heterocycles, we have studied, in previous works, the thermochemistry of some substituted thiophenes, such as 2-n-and 3-n-alkylthiophenes [23], 2-and 3-thiopheneacetic acids methyl esters [24], 2-and 3-acetylthiophenes [25], some thiophenecarbonitrile derivatives [26], and 2-thiophenecarboxamide and 2-thiopheneacetamide [27]. In this paper, we extend our study to the thiophenecarboxaldehydes and to some of their alkyl derivatives.…”