| 摘要 |
<p>Prepn. of cpds. of formula (where R1-R4 and R6 are H or 1-5C alkyl and R5 is 1-5C alkyl) comprises hydrogenating the corresp. alpha beta ethylenically unsaturated aldehyde in the absence of water and in the presence of a Pd based catalyst and at least 10% based on the diene aldehyde of pyridine, quinoline or 8-hydroxy-quinoline. The starting of pyridine, quinoline or 8-hydroxy-quinoline. The starting diene aldehyde is pref. citral to prepare citronellal. An inert third solvent is pref. used and the reaction temp is 10-60 degrees C. The amt. of Pd is pref. 0.0005-1g per 100 g dienealdehyde. The products can be used directly in perfume compsn or as intermediates for preparing other cpds. The above enables yields of >=95% and with a yield of the undesirable 3,7-dinethyloctanal 1%, pref. 0.1%.</p> |
