Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Oxygenated phenols are mono-formylated using a mixture of paraformaldehyde, MgCl 2 , and Et 3 N in THF. In all cases but one, only one regioisomer of the salicylaldehyde is obtained in good to high yield. ... In conclusion, we have extended our simple and regioselective ortho- ...