| 摘要 |
2,3-Dilithiobuta-1,3-dienes of the formula I <IMAGE> in which R<1> to R<4> represent aliphatic, cycloaliphatic or araliphatic radicals, and processes for the preparation of these compounds by reaction of 1,1,4,4-tetrasubstituted 2,3-dibromo-1,3-butadienes or butatrienes with elemental lithium in an inert solvent.
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