A DFT Study on Proton Transfers in Hydrolysis Reactions of Phosphate Dianion and Sulfate Monoanion

作者：Yamabe Shinichi^*; Zeng Guixiang; Guan Wei; Sakaki Shigeyoshi

来源：Journal of Computational Chemistry, 2014, 35(30): 2195-2204.

DOI：10.1002/jcc.23736

• proton transfer
• hydrolysis reaction
• phosphate diation
• sulfate monoanion
• theoretical calculation

B3LYP calculations were carried out on hydrolysis reactions of monosubstituted(R) phosphate dianion and sulfate monoanion. In the reacting system, water clusters (H2O)(22) and (H2O)(35) are included to trace reaction paths. For both P and S substrates with R=methyl group, elementary processes were calculated. While the phosphate undergoes the substitution at the phosphorus, the sulfate does at the methyl carbon. For the S substrate with R=neopentyl group, the product tert-amyl alcohol was found to be formed via a dyotropic rearrangement from the neopentyl alcohol intermediate. For R=aryl groups, transition-state geometries were calculated to be similar between P and S substrates. Calculated activation energies are in good agreement with experimental values. After the rate-determining transition state of the substitution, the hydronium ion H3O+ is formed at the third water molecule. It was suggested that alkyl and aryl substrates are of the different reactivity of the hydrolysis.

• 出版日期2014-11-15