A schematic of the solution is shown
below. The information from the
question is given in black. Deductions directly from this
information are given in red. Points that provide potential key
information
are shown by green arrows which leads to the
structures which are linked via the blue arrows to show the path
required
to work them all out. There are, of course, other
possible thought pathways.
This is not an easy problem as the
compounds in this problem look difficult
(no guessing), but there are 3 potential points of access to key
structures
(all based on names of compounds and common reactions).....
1. get D from the classic Claisen condensation of ethyl
ethanoate
2. get G from an aldol condensation with dehydration
(conjugated
product)
3. get B from the decarboxylation products propanone and CO2
being a b-ketoacid