Examlex
Four patterns can be noted for certain organic reactions: Pattern 1: Add a proton.
Pattern 2: Take a proton away.
Pattern 3: Reaction between an electrophile and nucleophile to form a new covalent bond.
Pattern 4: Reaction of a proton donor with a carbon-carbon double bond to form a new covalent bond.
To which pattern does the following reaction belong?
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