Thermal Decomposition Kinetics of Ethane Halides and Derivatives(C_2H_(6-n)X_n(n = 1~3);X = F,Cl,Br):DFT Study and NBO Analysis.pdfVIP
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Thermal Decomposition Kinetics of Ethane Halides and Derivatives(C_2H_(6-n)X_n(n = 1~3);X = F,Cl,Br):DFT Study and NBO Analysis.pdf
30卷 6期 结 构 化 学 (脚 GDUⅣ 【 匠) Vo1.3O.No.6
2011.6 Chinese Struct.Chem. 858~866
Therm alDecompositionKineticsofEthane
HalidesandDerivatives(C2H6.X栉 =1~3);
X=F,CI,Br):DFTStudyandNBOAnalysis
AbolfazlShiroudi① EhsanZahedi
(Chem~tryDepartment,IslamicAzadUniversity,Shahrood
Branch,P0Box36155/133,Shahrood,Iran)
ABSTRACT A theoreticalstudyofthethermaldecompositionkineticsofethanehalides
(C2H6x =1~3);X=FC1,Br)hasbeencarriedoutattheB3LYP/6—31++G 。andB3PW91/6—
31++G” levelsoftheory
. Amongthesemethodsandcomparisonofactivationparameterswith
availableexperimentalvalues.theB3PW 91/6—31++G—method isin good agreementwith the
experimentaldata.Theanalysisofbondorderandnaturalbondorbiatl B『O)charges,bond
indexes,andsynchronicityparameterssuggesttheeliminationofHX inreactionsl~9 (HF:
compounds1~3,HCI:compounds4~6,andHBr:compounds7~9)occurthroughaconcerted
andslightlyasynchronousfour-memberedcyclictransitionstatetypeofmechanism.
Keywords:elimination,abinitio,molecularmodeling,decomposition,ethanehalides,NBO
1 INTRoDUCTIoN vativesofethaneandethylene.Sisanesi,Nelli,and
Fonatnellio【Jwerethefirsttoreportthepyrolysisof
The elimination ofhydrogen halidesfrom alkyl theseries.These investigationshavebeen shown
halidestoyieldthecorrespondingolefinshasbeen that,attemperatures atwhich the firstproduct
extensivelysutdied[ . Thenatureofthereaction formation occurs,the principalmode ofdecom-
whichoccursuponpyrolysisofanalkylhalide,i.e. position isvia moleculareliminationofhyrdogen
whetherunimolecularorfreeradical,homog
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