申请人:BASF Aktiengesellschaft
公开号:US04629799A1
公开(公告)日:1986-12-16
3-Formyltetrahydrothiopyrans are prepared by hydrogenating a 3-formyl-5,6-dihydro-2H-thiopyran in the presence of a catalyst containing nickel, cobalt, platinum, copper and/or silver; if necessary, the 3-formyl-5,6-dihydro-2H-thiopyrans are prepared by converting bis-(.beta.-formylethyl) sulfides and/or 3-formyl-4-hydroxytetrahydrothiopyrans in the presence of an acidic catalyst, and, if required, these bis-(.beta.-formylethyl) sulfides and/or 3-formyl-4-hydroxytetrahydrothiopyrans are prepared by reacting an acrolein with hydrogen sulfide (a) in the presence of a basic catalyst and of methylene chloride, aromatic hydrocarbons and/or 1,1,2-trichloroethane as solvents, and/or (b) in the presence of a carboxamide. The compounds obtainable by the process according to the invention are useful starting materials for the preparation of dyes, drugs and pesticides.
通过在含有镍、钴、铂、铜和/或银的催化剂存在下,氢化3-甲醛基-5,6-二氢-2H-硫杂环戊烷制备3-甲醛基四氢硫杂环戊烷。必要时,在酸性催化剂存在下,通过转化双-(β-甲酰乙基)硫化物和/或3-甲醛基-4-羟基四氢硫杂环戊烷制备3-甲醛基-5,6-二氢-2H-硫杂环戊烷。如果需要,这些双-(β-甲酰乙基)硫化物和/或3-甲醛基-4-羟基四氢硫杂环戊烷可以通过在碱性催化剂和氯甲烷、芳香烃和/或1,1,2-三氯乙烷作为溶剂存在下,反应丙烯醛和氢硫化物(a),和/或在羧酰胺存在下反应制备。根据本发明所述的方法获得的化合物是制备染料、药物和农药的有用起始材料。