(2-methyl-3-hydroxy-4h-pyran-4-one is prepared by contacting 1(2-furyl)-1-ethanol in aqueous solution with two equivalents of a halogen oxidant at room temperature and then heating until the hydrolysis of the formed 4-halo-dihydro-pyran intermediate is substantially complete. Other valuable related gamma-pyrones are prepared in analogous manner from appropriate alcohols.
2-甲基-
3-羟基-4H-吡喃-4-酮是通过将1(2-
呋喃基)-1-
乙醇在
水溶液中与两当量的卤素氧化剂接触,并在室温下加热,直到形成的4-卤代-二氢
吡喃中间体的
水解基本完成而制备的。类似地,其他有价值的相关伽玛-
吡喃可以从适当的
醇类以类似的方式制备。