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Theoretical study to synthesis 1,3,5,-tri glycerol benzene using Semi-empirical and Ab-Initio calculation methods | ||
| Iraqi National Journal Of Chemistry | ||
| Article 1, Volume 0, Issue 39, 2014, Pages 481-498 | ||
| Author | ||
| Abbas .Abid Ali.Drea | ||
| Abstract | ||
| Abstract Theoretical study has been carried out through simulation of synthesis using quantum methods (semiemprical &Ab-initio ),that’s included in Hyper Chem 6.02 program. to under standing the Substitution reaction mechanism, and intermediates ,and transition structures involved during the reactions. Chemical activity and chemical interaction of reactants and products have been studied by surface potential energy calculations . estimation of the high probable active sites in attachment of esterification and alkylations, the energetic properties have been studied ,as total energy, atomic charge , bond stability bond torsion, electric static field, and heat formation content. The probable of first alkylation step has been studied through calculation of total energy , electric dipole moment constant , and heat change formation . In addition activation energy barrier calculation of all probable reactions have been carried out steps of the alkylation reaction. Thermodynamically of ester hydrolyzed been estimated for 1,3,5,-tri glycerin benzene ,when chemical activity of synthetic compound has been studied through calculation of total energy ,electrostatic potential, electric dipole moment constant ,atomic charge distribution, electronic spectrum and heat formation change . Twenty two of different chemical structure have been suggested and studied ,that’s represent the most important components of reactions mechanism involved during reactions. All probable occurrence reactions of substitution reactions were studied . high probable reactions that is having lowest activation energy value are testing by comparing with other probable competitive reactions(another probabilities),also the total change in heat content of reactions has been calculated. Calculations show that’s , hydroxyl group and hydrogen atom in glycerol molecules of secondary carbon atom are more active than of primary carbon atom for esterification and alkylation reactions respectively. glycerol react efficiently with acetic acid in three steps to produced tri acetate glycerol through endothermic reaction ∆Hre = 28.157 kCal mol-1 . Alkylation reactions at aromatic ring take place through controlling system of orientation to give up 1,3,5- Tri (glycerol tri acetate) benzene by endothermic reaction ∑ ∆Hrea = 8.967(kCal mol-1 ). 1,3,5- Tri glycerin benzene produced during hydrolysis the ester derivative with nine mole of water molecule by exothermic reaction ∆Hrea = -120.991(kCal mol-1 ).large electronic density occurs through new products for nine polar functional gropes of hydroxyl. | ||
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