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Ylide
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===Other=== '''Halonium ylides''' can be prepared from allyl halides and metal [[carbenoid]]s. After a [2,3]-rearrangement, a homoallylhalide is obtained. The active form of [[Tebbe's reagent]] is often considered a titanium ylide. Like the Wittig reagent, it is able to replace the oxygen atom on carbonyl groups with a methylene group. Compared with the Wittig reagent, it has more functional group tolerance.
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