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. ... An alternative method for the preparation of MAC reagents, HC(CN) 2 OR, was developed. Using the proposed method, MAC reagents with acyl moiety were synthesized from malononitrile in more than 60% overall yields in three steps. ... Masked acyl cyanides, RO-CH(CN) 2 , were ...