Rhodium(I) Complexes Bearing Hydroxyl-Functionalized 1,2,3-Triazolylidenes and Their Catalytic Application

We report the straightforward synthesis and full characterization of a novel series rhodium(I) complexes (3 a-c) supported by hydroxyl-functionalized 1,2,3-triazolylidenes. All new compounds were fully characterized by means of H-1 and C-13 NMR spectroscopy, melting points, and elemental analyses. The new triazolylidene rhodium complexes 3 a-c were tested as catalysts in the hydrosilylation of terminal alkynes and the 1,4-addition of boronic acid to 2-cyclohexenone. Both catalytic processes provide good to excellent yields under low catalyst loadings and in the case of the hydrosilylation, a good selectivity toward the E-isomer is observed.

Automated summary

We report the synthesis and characterization of a novel series of rhodium(I) complexes supported by hydroxyl-functionalized 1,2,3-triazolylidenes. These complexes exhibit excellent catalytic activity in the hydrosilylation of terminal alkynes and the 1,4-addition of boronic acid to 2-cyclohexenone.