Ma. Ryashentseva, A PREPARATIVE SYNTHESIS OF INDOLE BY DEHYDROGENATION OF 4,5,6,7-TETRAHYDROINDOLE OVER CATALYSTS WITH A LOW PALLADIUM CONTENT, Russian chemical bulletin, 42(10), 1993, pp. 1756-1757
Catalysts containing 0.15-0.5 % of Pd are highly active and selective
in the dehydrogenation of 4,5,6,7-tetrahydroindole to indole when gamm
a-Al2O3 or Sibunite are used as supports.