A review, with 38 refs., of several new methods for Baeyer-Villiger reaction with various oxidants (O-2, H2O2, m-chloroperbenzoic acid, K peroxymonosulfate and bis(trimethylsilyl) peroxide) in ionic liq. as solvents and oxidn. catalysts. Tech. aspects of recycling of ionic liqs., product sepn. from post-reaction mixt. and use of 2 - phase reaction systems with solid catalyst were taken into consideration.