| 摘要 |
Arom. aldehydes were prepd. from the acids by forming mixed anhydrides with ClCO2R (R = Et, Me2CH) and hydrogenating over a Pd-BuSO4 poisoned with S and quinoline. Thus, 14.2 g 10% Pd/BaSO4 and 0.1 ml a soln. contg. 3 X 10-3 part S and quinoline were added to 10.1 mol 3, 4, 5-(MeO)3C6H2CO2CO2Et in 300 ml THF and the mixt. hydrogenated for 12 hr at ordinary temp. and pressure to give 17.64 g 3, 4, 5-(MeO)3C6H2CHO.
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