Methyl butanoates

Lithium enolate of methyl butanoate (weaker base)... 

Chemical Name 2-[ [2-[3-(Acetylamino) -2,4,6-triiodophenoxy] ethoxy] methyl] -butanoic acid... 

Starting from an ester, the only possibility is addition of methylmagnesium bromide to an ester of butanoic acid, such as methyl butanoate. 

Esters are among the most widespread of all naturally occurring compounds. Many simple esters are pleasant-smelling liquids that are responsible for the fragrant odors of fruits and flowers. For example, methyl butanoate is found in pineapple oil, and isopentyl acetate is a constituent of banana oil. The ester linkage is also present in animal fats and in many biologically important molecules. 

Write the condensed structural formulas of the acid and alcohol that react to form methyl butanoate, CH3(CH2)2COOCH3, a contributor to the flavor of apples. 

RAFT polymerization of two anionic acrylamido monomers sodium 2-acrylamido-2-methylpropane-sulfonate, AMPS, and sodium 3-acrylamido-3-methyl-butanoate, AMBA, (Scheme 29) was conducted in water at 70 °C using 4,4/-azobis(4-cyanopentanoic acid) as the initiator and 4-cyanopentanoic acid dithiobenzoate as the RAFT chain transfer agent [80]. The synthesis was initiated either from one monomer or the other leading to narrow molecular weight distributions in both cases (Mw/Mn < 1.2). 

Valine Val V 2-Amino-3-methyl-butanoic acid (C H jfeCH - C H(N H2) - COOH... 

---