Synthese von (‐)‐(R)‐4‐Hydroxy‐β‐ionon und (‐)‐(5 R, 6 S)‐5‐Hydroxy‐4,5‐dihydro‐α‐ionon aus (‐)‐(S)‐α‐Ionon

Synthesis of (‐)‐(R)‐4‐Hydroxy‐β‐ionone and (‐)‐(5 R, 6 S)‐5‐Hydroxy‐4,5‐dihydro‐α‐ionone aus (‐)‐(S)‐α‐Ionone The absolute configuration of the chiral 4‐hydroxy‐β‐ionones and 5‐hydroxy‐4,5‐dihydro‐α‐ionones has been determined by chemical connection with (‐)‐(S)‐α‐ionone i.e. by stereoselective epoxidation of the latter, followed by base catalyzed opening of the epoxide as well as by its hydride reduction.