Suta K, Turks M. In(III) and Hf(IV) Triflate-Catalyzed Hydration and Catalyst-free Hydrohalogenation of Aryl Acetylenes in Liquid Sulfur Dioxide.
ACS OMEGA 2018;
3:18065-18077. [PMID:
31458393 PMCID:
PMC6643593 DOI:
10.1021/acsomega.8b01630]
[Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Accepted: 12/04/2018] [Indexed: 05/06/2023]
Abstract
The use of liquid sulfur dioxide as a reaction solvent to promote chemical transformations of alkynes has been explored. First, a combination of liquid SO2 and In(OTf)3 or Hf(OTf)4 as a catalyst allows to perform hydration of aryl alkynes under mild conditions without a direct addition of Brønsted acid. Second, novel catalyst-free conditions for the synthesis of α-vinyl iodides, bromides, and chlorides from aryl alkynes have been developed in liquid SO2 using group I and II metal halides and ammonium iodide as the halide ion sources.
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