| 摘要 |
Manufacture of an aldehyde (I) involves gaseous phase reaction of carboxylic acid or its ester (II) with hydrogen in presence of a lanthanum trioxide catalyst. Manufacture of an aldehyde of formula (I) involves gaseous phase reaction of carboxylic acid or its ester of formula (II) with hydrogen in presence of a lanthanum trioxide catalyst. R<1>, R<2>, R<3> = 1-6C alkyl, 3-8C cycloalkyl, aryl, 7-12C alkylphenyl or phenylalkyl; (R<1> and R<2>) = 3-7 membered alicyclic ring; R<1>, R<3> = 1-4C alkoxy, phenoxy, methylamino, dimethylamino or halogen; R<1> = hydroxy or amino; and R<4> = H, 1-6C alkyl, 3-8C cycloalkyl, aryl, 7-12C alkylphenyl or phenylalkyl.
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