Note that no other reagents are needed in order to complete any of these sequences, you should only be using what is there.
Common errors : (1) steps inconsistent with the basic reaction conditions, (2) not accounting for all bonding changes (3) balancing formal charges
A
Ester formation (forwards):
Ester hydrolysis (backwards):
B1 An aldol condensation:
B2 Dieckmann condensation & ester hydrolysis :
