You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

The 2,3- rearrangement of this name makes homoallylic alcohols from allyl ethers. The better-known reaction of this name involves a betaine intermediate, especially under conditions of excess lithium salts in the (*) Schlosser modification. For 10 points give the common name of these two reactions, the better-known of which is a synthesis of alkenes from carbonyl compounds using phosphonium ylides.
Output:
Science