What reactions can be used to carry out the transformation: butanol-1 – butanoic acid – butanoic acid propyl ester.

Here are the reaction equations for organic substances:
Н3С – СН2 – СН2 – СН2 – ОН + CuO = Н3С – СН2 – СН2 – СНО + Cu + H2O – butanol oxidation with copper oxide occurs upon heating, butanal is obtained;
С4Н8О + Ag2O = C3H7 – COOH + 2Ag – oxidation of butanal with silver oxide in the presence of ammonium hydroxide, the reaction proceeds when heated;
C3H7 – COOH + C3H7 – OH = C3H7COO – C3H7 + H2O – esterification occurs when heated in the presence of sulfuric acid, which adds water.
The final product of the synthesis, butyl butyrate ester, is used to make essential oils in perfumery.