Pollution comes from many small sources.
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Answer:
Figure 1
Explanation:
In this case, we have to ester with a <u>"malonic synthesis"</u> in which we have to add a strong (ethoxide) to produce an enolate ion that would form a new C-C bond with an alkyl halide (ethyl bromide and bromo pentane). Then a <u>"nucleophilic acyl substitution reaction"</u> takes place to add thiourea, in this step two ethanol groups are eliminated to form a cyclic structure. Finally, an "<u>elimination reaction"</u> happen by the addition of sodium hydroxide generating a double bond and a negative charge in the sulfur atom that is neutralized with the positive charge of sodium.
See figure 1 for the total mechanism
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