Reactions — P
- Paal Thiophene Synthesis
- Paal−Knorr Furan Synthesis
- Paal−Knorr Pyrrole Synthesis
- Parham Cyclization
- Parikh–Doering Oxidation
- Passerini Reaction
- Paternò−Büchi Reaction
- Pauson−Khand Reaction
- Payne Rearrangement
- Pechmann Coumarin Synthesis
- Pechmann Pyrazole Synthesis
- Pellizzari Reaction
- Perkin Reaction
- Perkin Synthesis
- Petasis Reaction
- Peterson Olefination
- Petrenko–Kritschenko Piperidone Synthesis
- Pfitzinger Reaction
- Pictet−Gams Synthesis
- Pictet−Hubert Synthesis
- Pictet−Spengler Synthesis
- Piloty–Robinson Pyrrole Synthesis
- Pinacol Rearrangement
- Pinnacol Coupling
- Pinner Pyrimidine Synthesis
- Pinner Reaction
- Pinnick–Kraus–Lindgren Oxidation
- Polonovski Reaction
- Polonovski−Potier Reaction
- Pomeranz−Fritsch Reaction
- Pomeranz−Fritsch Reaction (Bobbitt Modification)
- Pomeranz−Fritsch Reaction (Schlittler−Müller Modification)
- Povarov Reaction
- Prévost Trans-dihydroxylation
- Prilezhaev Reaction
- Prins Reaction
- Pschorr Cyclization
- Pummerer Rearrangement