Abstract
The work reports the theoretical investigation of the mechanism and regioselectivity of the Pd(OAc)2-catalyzed hydrothiolation of heteroatom-substituted alkenes with benzenethiol leading to Markovnikov-type product. The reaction process includes: (1) activation of the S–H bond for benzenethiol by the catalyst Pd(OAc)2; (2) migratory insertion of the alkenes bearing heteroatoms into the Pd–S bond; (3) AcOH molecule attacks Pd–C bonds to give the product and release the catalyst. In addition, the computed results shown that Pd(OAc)2-catalyzed hydrothiolation take place by two possible channels and get anti-Markovnikov-type or Markovnikov-type species. The Markovnikov-type reaction channel is more favored with the energy barriers of 21.9–25.6 versus 28.5–31.2 kcal/mol for the anti-Markovnikov-type pathway. The theoretical results and the experimental observations of Tamai and co-workers are consistent. This reaction would proceed in mild conditions and afford the Markovnikov-type products in high yields and regioselectivity.
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Acknowledgments
This work was supported by Longyuan young creative talents to support projects, Gansu Province (2014–98). We are grateful to the Gansu Province Supercomputer Center for essential support. We are grateful to the reviewers for their invaluable suggestions.
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Ji, Ch., Zhang, Xh. DFT study on the mechanism of Pd(OAc)2-catalyzed hydrothiolation of alkenes bearing heteroatoms with benzenethiol. Struct Chem 27, 919–926 (2016). https://doi.org/10.1007/s11224-015-0673-x
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DOI: https://doi.org/10.1007/s11224-015-0673-x