SYNTHESIS OF 3,4-DIHYDROISOQUINOLINES, 2-ALKYL(ACYL)-1(2H)-3,4-DIHYDROISOQUINOLINONES, 2-ALKYL-1(2H)-ISOQUINOLINONES AND 1-ALKYL-2(2H)-QUINOLINONES BY OXIDATION WITH POTASSIUM PERMANGANATE