CHEM 130 Lecture Notes - Lecture 6: Aldehyde, Aliphatic Compound, Ring Current
Document Summary
The aldehyde region: unsaturated carbon bonded to oxygen. It is directly attached to a carbonyl group one of the most electronwithdrawing groups that exists and is very deshielded, resonating with the largest shifts of any ch protons in the 9 10 p. p. m. region. The examples below are all compounds that we have met before. Its cho proton is less deshielded than most the amide delocalization that feeds electrons into the carbonyl group provides some extra shielding. Conjugation with an oxygen atom has much the same effect formate esters resonate at about 8 p. p. m. but conjugation with p bonds does not. The simple conjugated aldehyde below and myrtenal both have cho protons in the normal region (9 10 p. p. m. Two other types of protons resonate in this region: some aromatic protons and some protons attached to heteroatoms like oh and nh.
