Dimeric homochiral Mn(III) Salen complex 1 has been investigated as a catalyst for enantioselective epoxidation of indene, styrene, chromene and substituted chromenes in presence of pyridine N-oxide (PyN-O) using oxone (KHSO5) as oxidant. Excellent conversions (>99%) were obtained with all alkenes except indene but high chiral induction (>99%) was obtained in case of nitro and cyano chromene by GC/H-1 NMR using Eu(hfc)(3)/HPLC. The system works well using 7 mol% catalyst loading with retention of enantioselectivity and catalyst that could be recycled up to three cycles. (C) 2003 Elsevier Science B.V. All rights reserved.