“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] To date, more than 150 symmetrical and unsymmetrical 1,2,4,5-tetraoxanes have been synthesized. Most symmetrical tetraoxanes were prepared by acid-catalyzed cyclocondensation of hydrogen peroxide with ketones and benzaldehydes; 3,7, [13][14][15][18][19][20][21][22][23][24][25] cyclocondensation of bis(trimethylsilyl) peroxide with carbonyl compounds promoted by trimethylsilyl trifluoromethanesulfonate (TMSOTf); 2,6b,11 ozonolysis of olefins, 22,26 enol ethers, 27,28 and O-ether oximes 5,12,29 (Scheme 1). A number of other methods were also used for the synthesis of these compounds.…”