The epoxidation of cyclooctene and cis-stilbene was performed by tetra-n-butylammonium periodate (nBu 4 NIO 4 ) in the presence of (tetraarylporphyrinato)manganese(III) [Mn(por)] and imidazole (im) in various CH 2 Cl 2 /alcohol solvents (alcohol = CH 3 OH, C 2 H 5 OH, n-C 3 H 7 OH, i-C 3 H 7 OH, t-C 4 H 9 OH). In accord with the coordinating abilities of the alcohols to [Mn(por)], the epoxidation yields increased from CH 2 Cl 2 /CH 3 OH to CH 2 Cl 2 /t-C 4 H 9 OH. In the epoxidation of cis-stilbene in the presence of (acetato)(tetraphenylporphyrinato)manganese(III) [Mn(tpp)(OAc)], the cis-to transstilbene oxide ratio increased consistently with the bulk of the alcohol in CH 2 Cl 2 /alcohol solvents. Also, it was found
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