申请人:BASF Aktiengesellschaft
公开号:US04250101A1
公开(公告)日:1981-02-10
Bis-epoxy-dialkoxy-alkanes are valuable intermediates for the preparation of the sought-after aromatic 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one. The novel bis-epoxy-dialkoxy-alkanes are obtained by reacting the corresponding .alpha.,.alpha.'-dihalo-1,2-diketones with an alkali metal hydroxide or an alkali metal alkoxide and an alkanol at from -20.degree. to +100.degree. C. To prepare the 2,5-dialkyl-4-hydroxy-2,3-dihydro-furan-3-ones, which are valuable aromatics, the novel bis-epoxy-dialkoxy-alkanes are heated with strong mineral acids or strong organic acids at from 60.degree. to 120.degree. C.
双环氧双醚烷是制备所需的芳香族2,5-二甲基-4-羟基-2,3-二氢呋喃-3-酮的有价中间体。新型的双环氧双醚烷是通过将相应的α,α'-二卤代-1,2-二酮与碱金属氢氧化物或碱金属醇盐和烷醇在-20℃至+100℃反应得到的。为了制备有价值的芳香族2,5-二烷基-4-羟基-2,3-二氢呋喃-3-酮,新型的双环氧双醚烷在60℃至120℃下与强矿酸或强有机酸加热。