Advantame is optically active. On the diagram of Advantame, circle every chiral carbon atom.
Advantame decomposes to give three molecules, J, K and L. The RO- group in Advantame does not react. Suggest suitable reagents and conditions for this decomposition.
Name the reaction type taking place.
Draw the structure of L in the box provided.
Advantame decomposes to produce three molecules, J, K and L. The RO- group in Advantame is unreactive.
Aqueous bromine was added dropwise to a solution of J until excess bromine was present. State what you would observe.
J has the molecular formula $\text{C}_{14}\text{H}_{19}\text{O}_6\text{N}$. Use this formula to write an equation for the reaction of excess aqueous sodium hydroxide with one mole of J.
State what you would observe when excess aqueous bromine is added to a solution of K.
K can be polymerised. Draw the structure of the polymer showing two repeat units. The linkage between the monomer units should be fully displayed.
Use the *Data Booklet* when answering this question. The carbon-13 NMR spectrum of K was obtained.
State how many chemically different carbon environments there are in K.
The chemical shifts, $\delta$, due to two of the carbon atoms x and y present in K are given in the table: x = $130$ ppm, y = $170$ ppm. On the structure of K, circle and label two carbon atoms which could correspond to x and y.