Part 1 of this article (Synthesis1985, 1-26) was concerned with practical aspects of organic synthesis under high pressure and various types of ionic reactions under such conditions. The present Part II is now concerned with some synthetic applications of high pressure technology to formally pericyclic reactions such as cycloaddition, ene, and other pericyclic reactiones. 4. Pericyclic Reactions 5. Cycloaddition Reactions 5.1 Diels-Alder Reactions 5.2 1,3-Dipolar Reactions 5.3 [2 + 2]Cycloadditions 5.4 Other Cycloadditions 6. Ene Reactions 7. Other Pericyclic Reactions 7.1 Electrocyclic Reactions 7.2 Sigmatropic Reactions 7.3 Cheletropic Reactions 7.4 Miscellaneous Reactions 8. Conclusions