R1CO
R1CO is a symbolic notation used in organic chemistry to denote a generic acyl fragment of the form R1-CO-. The R1 represents a variable substituent, which may be an alkyl, aryl, or other group attached to the carbonyl carbon. The fragment is commonly encountered in reaction schemes, mechanisms, and teaching examples where the exact identity of the substituent is not important to the discussion.
In contexts where R1CO participates in reactions, the carbonyl carbon is the electrophilic center; nucleophilic attack
R1CO appears in many derivative names and reaction schemes: R1COCl (acyl chloride), R1COOR' (esters), R1CONR'R'' (amides).
Limitations: because R1CO is not a single compound, its properties are not fixed; actual reactivity depends