Using bromobenzene and ethylene oxide as your only sources of carbon, show how you could prepare trans-2,3-diphenyloxirane (a racemic mixture of enantiomers). One possible synthetic route involves an epoxide intermediate: These transformations can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order for each transformation, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer. A B C D dilute H2SO4 1) ; 2) H3O+ cat. OsO4, NMO MCPBA (RCO3H) E F G H H2, Lindlar's cat. 1) PhMgBr; 2) H3O+ Mg Na, NH3 (l) I J K L 1) PhCH2MgBr; 2) H3O+ HBr(xs), heat NaH conc. H2SO4, heat 1st Reagents: