Regioselective Ring-Opening Reaction of Unsymmetrical 2,3-Diaryl Epoxides via Catalytic Hydrogenolysis with Pd(0)EnCat (TM)

[摘要]：A series of unsymmetrical 2,3-diaryl epoxides were hydrogenated under transfer-hydrogenation conditions using the poly-urea-encapsulated palladium catalyst [Pd(0)EnCat (TM)]. The position of the cleaved C-O bond was determined by H-1 NMR analysis of the ring-opened products derived from the epoxide, in which one of the two benzylic methyne protons is deuterated. The ratio of ring-opened products of the unsymmetrically substituted 2,3-diaryl epoxides was affected by the degree of the steric bulkiness on the aromatic ring.

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