31. The resulting C12 carbocation can continue to react with an olefin to form a larger carbocation . 32. _1994 : George A . Olah, United States, for his contributions to carbocation chemistry. 33. The more substituted the carbocation , the more stable it is, due to induction and hyperconjugation. 34. A 1, 3-hydride shift then takes place to give a more stable allylic carbocation . 35. This carbocation intermediate can readily undergo rearrangements, which can lead to a complex mixture of products. 36. Acetic acid is often used as a solvent for reactions involving carbocations, such as rearranged carbocation . 37. This reactivity is due to the relative stability of the tertiary and secondary carbocation over the primary carbocations. 38. With a stereogenic center next to the carbocation the substitution can be stereoselective in intra and intramolecular reactions. 39. A rearrangement reaction of the carbocation follows with ring closure to "'9 " '. 40. Alkyl substitutions on the olefins have been seen to increase the reaction rate by stabilizing the resulting carbocation .
