(i) NaOH, MeOH, (ii) (thermolysis), (iii) polyphosphoric acid; Multistep reaction;

<b>Multi-step reaction with 5 steps<br /> </b>1: (i) LiAlH₄, (ii) PBr₃ <br />2: ethanol<br />3: (i) NaOH, MeOH, (ii) /BRN= 102415/<br />4: LiAlH₄ <br />5: (i) PBr₃, (ii) /BRN= 774687/, NaH<br /> <br /> &nbsp;