1) CH3-CH2-CH2-OH->CH3-CH=CH2+H2O
2) CH3-CH=CH2+HBr->CH3-CH2-CH2-Br
3) CH3-CH2-CH2-Br+NH3=[CH3-CH2-CH2-NH3]Br
4) [CH3-CH2-CH2-NH3]Br+NaOH=CH3-CH2-CH2-NH2+NaBr+H2O
5) CH3-CH2-CH2-NH2+Br-CH2-CH2-CH3=[(CH3-CH2-CH2)2-NH2]Br
6) [(CH3-CH2-CH2)2-NH2]Br+NaOH=(CH3-CH2-CH2)2-NH+NaBr+H2O