6. One of the most useful methods for determining enantiomeric composition
is to derivatize the alcohol with a chiral nonracemic reagent and examine
the ratio of resulting diastereomers by gas chromatography (gc).104 There are
many derivatizing agents available, but the most widely used are derivatives
of a-methoxy-a-trifluoromethylphenyl acetic acid (MTPA, Mosher’s acid