Back to results
US 5,493,038 AGranted
Method of preparation of lithium alkylamides
AssigneeFMC Corporation
InventorsRandy W. Hall, Conrad W. Kamienski, Robert C. Morrison, John F. Engel
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFMC Corporation
InventorsRandy W. Hall, Conrad W. Kamienski, Robert C. Morrison, John F. Engel
Estimating the term…
A process for quickly preparing easily separable solutions of lithium alkylamides, as exemplified by the formula (R.sub.3 M).sub.x NLi(R1).sub.y.(LB).sub.z (I) wherein M is silicon or carbon, R and R.sup.1 are C.sub.1 -C.sub.8 alkyl, cycloalkyl or alkylene groups, LB is a Lewis base, x and y are integers equaling 2, and z is greater than 1, comprising the steps of reacting lithium metal in bulk form with an alkylamine in mole ratios of metal to alkylamine ranging from 2 to 1 to 10 to 1 in a solvent selected from ethereal or selected from the group consisting of conjugated dienes, vinyl aromatic and polycyclic aromatic compounds, under an inert atmosphere at elevated temperatures for 1 to 10 hours, cooling the product and separating the product solution from the unreacted lithium metal in the reactor.
A process for quickly preparing easily separable solutions of lithium alkylamides, as exemplified by the formula
A process for quickly preparing easily separable solutions of lithium alkylamide comprising the steps of reacting lithium metal in bulk form, with an alkylamine in mole ratios of metal to alkylamine ranging from 2 to 1 to 10 to 1 in a solvent selected from ethereal or ethereal/hydrocarbon solvents in the presence of an electron carrier selected from, the group consisting of conjugated dienes, vinyl aromatic and polycyclic aromatic compounds, under an inert atmosphere at elevated temperature for 1 to 10 hours, cooling the product and separating the product solution from the unreacted lithium metal in the reactor, adding additional solvent and sufficient lithium metal, electron carrier and alkylamine to the unreacted metal in the reactor to re-establish the mole ratio of lithium metal to alkylamine, and continuing the reaction, thereby forming further lithium alkylamide, and repeating these process steps a number of times.
The process of claim 10 wherein the number of repetitions of said reaction steps is at least three.
Dependencies are inferred from the claim text.