| 摘要 |
<p>A 3,4-substituted benzaldehyde is prepared by the process: …<CHEM>… wherein… A is -OH, X or -OCOCH3,… X is halogen, and… R<1> and R<2> are each H or C1-4 alkyl but are not both H, or… R<1> and R<2> together are C1-4 alkylene… Examples of the aldehydes are heliotropin and veratraldehyde.</p> |
