View all references , 2 2. Blicke , FF ; Lu , CJ 6-Amino-2,3-dimethylindole . J. Am. Chem. Soc. 1952 , 74 , 3933 – 3934 . [CrossRef], [Web of Science ®] View all references ] continues to be the most widely used formylating reagent, but it is sensitive to decomposition to acetic acid and carbon monoxide. Many other useful formylation reagents have been reported such as chloral, [ 3 3. Waki , J. ; Meienhofer , J. Efficient preparation of Na-formylamino acid ...