Reactions — R
- Radziszewski Reaction
- Rambler–Bäcklund Reaction
- Rapoport Oxidation
- Reformatsky Reaction
- Regitz Diazo Synthesis
- Regitz Diazo Synthesis (Modified)
- Reimer−Tiemann Reaction
- Reissert Indole Synthesis
- Reissert Reaction
- Reppe Alkyne Cyclotrimerization
- Riehm Quinoline Synthesis
- Riley Oxidation (Allyll)
- Riley Oxidation (Carbonyl)
- Ritter Reaction
- Robinson Annulation
- Robinson−Gabriel Synthesis
- Robinson−Schöppf Reaction
- Rosenmund Reduction
- Roush Crotylboration
- Rubottom Oxidation
- Ruff Degradation
- Rupe Rearrangement