Grignard Organometallic
Music (Enter Sandman) by Metallica
Lyrics by Megan Arman

you've got an R-MgX
or an R-Li
you want RCOOH
that's a Grignard reagent
or an organometallic compound with lithium
to a carboxylic acid

remember that organometallic compounds
react with other functional groups

C-O-2
Et-2-O
H-3O+

will yield your carboxylic acid