Synthesis Of Polycyclic Hydrocarbons C14h20 By Hydrogenation Of Exo-Exo-, Exo-Endo-, Endo-Exo-, And Endo-Endo-Hexacyclo[9.2.1.0(2,10).0(3,8).0(4,6).0(5,9)]Tetradec-12-Enes With H2so4 And Isomerization Of The Products To Diamantane Induced By Ionic Liquids