Phenylsodium, deprotonation dihaloalkanes using

Hydroxide and alkoxide anions are strong enough bases to promote a elimination from chloroform, and from other trihalomethanes. Carbenes can be formed from dihaloalkanes by deprotonation with stronger bases such as LDA, and even from primary alkyl chlorides using the extremely powerful bases phenylsodium or f-BuLi/f-BuOK (weaker bases just cause P elimination). 

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See also in sourсe #XX -- [ ]

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