1 Supporting Information Active and Recyclable Catalytic Synthesis of Indoles by Reductive Cyclization of 2(2Nitroaryl)acetonitriles in the Presence of CoRh Heterobimetallic Nanoparticles with Atmospheric Hydrogen Under Mild Conditions Isaac Choi, Hyunho Chung, Jang Won Park, and Young Keun Chung* Department of Chemistry, College of Natural Science, Seoul National University, Seoul 08826, Korea ykchung@snu.ac.kr Table of Contents 1. General Remarks S2 2. Immobilization of Co/Rh Nanoparticles on Charcoal S2 3. Experimental Procedure S3 A. General Procedure 1 B. General Procedure 2 C. General Procedure 3 D. General Procedure 4 E. General Procedure 5 F. General Procedure 6 G. General Procedure 7 H. Gram9Scale Experiment 4. Reduction of Benzonitrile S7 5. Reductive Cyclization in the Presence of Monometallic Nanoparticles S8 6. Reuse of Co 2 Rh 2 /C in the Synthesis of Indoles S8 7. Plausible Reaction Pathways S9 8. References S10 9. Characterization Data for Isolated Products S10 10. NMR Spectra S34