(E)-3-[1-(6-Methoxy-5-methyl-3,4-dihydro-2H-pyran-4-yloxy)-1-methyl-ethyl]-2-methyl-penta-2,4-dienoic acid methyl ester 在
氢气 作用下,
生成 (E)-2-Methyl-3-[1-methyl-1-((3R,4R)-3-methyl-2-oxo-tetrahydro-pyran-4-yloxy)-ethyl]-penta-2,4-dienoic acid methyl ester