Reference

Exchange-enthalpy parameters for binary mixtures of low molecular weight and simple chain-like compounds

Exchange-enthalpy parameters for binary mixtures of low molecular weight and simple chain-like compounds. Crescenzi, V.; Manzini, G. (Ist. Chim., Univ. Trieste, Trieste, Italy). J. Polym. Sci., Polym. Symp., 54(Polym. Sci.: Achiev. Prospects, Symp., 1975), 315-25 (English) 1976. CODEN: JPYCAQ. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 23 Calorimetric and volumetric data, obtained at 25.degree., for PhMe contg. mixt. of a series of aliph.Several reagents such as 26354-94-9 is used here. esters, two arom. esters, poly(.epsilon.-caprolactone) [24980-41-4], and poly(.delta.-valerolactone) [26354-94-9], along with equation-of-state parameters for each component in the pure liq., or amorphous, state and in combination with data reported by G. Manzini and V. Crescenzi (1975) were used to develop a rational, consistent description of the excess heats for liq. mixts. contg. ester mols. on the basis of the theory of P. J. Flory (1965). The enthalpy and excess vol. of mixing were measured for butyrates of MeOH, PrOH, and pentanol, diformates and diacetates of ethane, butane, hexane, and octane diols, and enzyl acetate [140-11-4] and methyl phenyl acetate [101-41-7]. Examn. along similar lines of reported calorimetric data for mixts. of different classes of compds., particularly aliph. ethers, gave support to the possibility of correlating the X12 parameter in Flory's theory with the chem. structure of the components for any given polar soln. via characteristic exchange-anthalpy parameters Xij between different chem. groups (ij etc.), each contributing a given fraction (.alpha.i, .alpha.j, etc.) of the total mol. service. .

Electrosynthesis of organic compounds

Electrosynthesis of organic compounds. X. Electrochemical oxidation of selected aryl thioesters in nonaqueous solvent. Ismail, M. T.; El-Khawaga, A. M.; El-Zohry, M. F.; Abdel-Wahab, A.Chemical with cas number 150-60-7 also plays role. A. (Fac. Sci., Assiut Univ., Assiut, Egypt). Bull. Soc. Chim. Fr., (5), 726-8 (English) 1986. CODEN: BSCFAS. ISSN: 0037-8968. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Section cross-reference(s): 22, 25 Electrochem. oxidn. of PhCOSPh, PhCOSCH2Ph, PhCH2COSPh, and PhCH2COSCH2Ph was carried out in abs. MeOH contg. 0.05 mol/L Ba(ClO4)2 as supporting electrolyte on a Pt anode at controlled anodic potential of +1.8 ± 0.03 V vs. SCE at 20°. The products obtained were aryl aldehydes, acids, esters, thio alcs. (or thiophenol) and disulfides. Besides, other minor products were also detected. A suitable mechanism involving the formation of cation radical intermediate species is suggested. The kinetic study of the oxidn. of the aryl thioesters was also carried out. Polarization curves were plotted, and 1 wave for the anodic oxidn. was obsd. The anodic oxidn. potentials were detd. .