Abstract Solutions of lithiated cumulenic ethers and bis-ethers R 2 CH [DOUBLE BOND] C [DOUBLE BOND] C [DOUBLE BOND] C (Li) OR 3 and R 1 OCH [DOUBLE BOND] C [DOUBLE BOND] C [DOUBLE BOND] C (Li) OR 3 can be obtained by treatment of the compounds R 1 OCH (R) 2) C [TRIPLE BOND] CCH 2 OR 3 and R 1 OCH 2 C [TRIPLE BOND] CCH (OR 3) 2 respectively with 2 equivalents of butyllithium in ether. Reaction of ...