A secondary alcohol is produced when one is reacted with a Grignard reagent.
Four equivalents of pyrrole and four equivalents of these compounds react to form a porphyrin ring. In an IR spectra of these compounds, smaller peaks appear on the right shoulder of the C-H stretches, at around 2700 inverse centimeters. Reacting hydrogen with an acyl chloride in the presence of palladium produces these compounds in the Rosenmund reduction. One of them reacts with a lysine residue in opsin to form rhodopsin. A secondary alcohol is produced when one is reacted with a Grignard reagent. Glyoxal contains two of these functional groups, and a primary alcohol can be partially oxidized by PCC to one of them. For 10 points, name these compounds which, unlike related ketones, contain a terminal carbonyl group.
Four equivalents of pyrrole and four equivalents of these compounds react to form a porphyrin ring.
aldehyde [prompt on carbonyl]