Described is a method of making sorbic acid, pentadiene, or 3-penten-2-one. The method includes partially hydrogenating 4-hydroxy-6-methyl-2-pyrone (HMP) to yield 5,6-dihydro-4-hydroxy-6-methyl-2H-pyran-2-one (4-DHMMP). Then, if 3-penten-2-one is desired, thermally decomposing the 4-DHMMP to yield 3-penten-2-one. If sorbic acid or pentadiene are desired, the 4-DHMMP is hydrogenated to yield 4-hydroxy-6-methyltetrahydro-2-pyrone (4-HMTHP). The 4-HMTHP is then dehydrated by contacting it with a solid acid catalyst to yield parasorbic acid (PSA). The PSA can then be ring-opened by contacting it with a solid acid catalyst. The reaction conditions of the ring-opening reaction can be controlled to yield sorbic acid and/or pentadiene.
描述了一种制备
山梨酸、
戊二烯或
3-戊烯-2-酮的方法。该方法包括部分氢化
4-羟基-6-甲基-2-吡喃酮(HMP)以得到5,6-二氢化-
4-羟基-6-甲基-
2H-吡喃-2-酮(4-DHMMP)。然后,如果需要
3-戊烯-2-酮,则热分解4-DHMMP以得到
3-戊烯-2-酮。如果需要
山梨酸或
戊二烯,则将4-DHMMP氢化以得到
4-羟基-6-甲基四氢-2-
吡喃酮(4-H
MTHP)。然后,通过与固体酸催化剂接触使4-H
MTHP脱
水以得到对
山梨酸(P
SA)。然后可以通过与固体酸催化剂接触使P
SA发生环开启反应。环开启反应的反应条件可以控制以得到
山梨酸和/或
戊二烯。