Stable mixed lithium amide reagent compositions
AssigneeCyprus Foote Mineral Company
InventorW. Novis Smith
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Abstract
A method for preparing lithium amides in a monocyclic aromatic solvent and the reagent compositions formed thereby.
Claims10
A reagent composition having improved thermal stability and which is free of ether consisting essentially of at least a 0.5 Molar concentration solution of a mixture of lithium amides selected from the group consisting of:
- ##STR3## wherein R, R' and R" are the same or different and each represent hydrogen, an alkyl of 1 to 8 carbon atoms or an alkyl monocyclic aliphatic group, R''' is hydrogen, alkyl or alkoxy, R.sup.4 is alkyl or phenyl,
- W is from 0 to 4,
- x is an integer of 2 to 8, and
- y is an integer of 2 to 6,
- and a monocyclic aromatic solvent,
- said reagent composition being derived from the reaction of n-alkyl lithium and at least two amines.
A reagent composition comprising a mixture of lithium diisobutyl amide and lithium diisopropyl amide in a monocyclic aromatic solvent, said composition comprising at least a 0.5 molar concentration of said amides in solution.
An ether-free reagent composition having improved thermal stability consisting essentially of at least a 0.5 molar concentration solution of a mixture of lithium amides of the formula consisting of ##STR4## wherein R, R.sup.1 and R" are the same or different and each represent hydrogen, an alkyl group of 1 to 8 carbon atoms or an alkyl monocyclic aliphatic group, and x is an integer of 2 to 8, in a monocyclic aromatic solvent,
- said lithium amides being the reaction product of n-alkyl lithium and a mixture of diamines.
Dependencies are inferred from the claim text.