Synthesis of lactam based ionic liquid
Lactamium based ionic liquids are described. They comprise at least one of: the reaction product of a lactam compound having a formula (IV) wherein n is 1, 2 or 4 to 8, and a Brøsted acid HX; or a Brøsted acid HX, where X is a halide, and a metal halide; where the reaction product is p-toluenesulfonate, halide, or the halometallate; or the reaction product of a lactam compound having a formula (V) wherein the ring has at least C—C one double bond, and n is 1 to 8, and a Brøsted acid HX; or a Brøsted acid HX, where X is a halide, and a metal halide; or the reaction product of a lactam compound having a formula (VI) wherein n is 1 to 8, m is 1 to 8, and the rings can be saturated or unsaturated; and a Brøsted acid HX; or a Brøsted acid HX, where X is a halide, and a metal halide.
1. A lactamium based ionic liquid selected from the group consisting of:
a reaction product of a lactam compound having formula
wherein n is 1,
and a Brønsted acid HX; or a Brønsted acid HX, where X is a halide, and a metal halide; where the reaction product is a halide, or a halometallate.
2. A method of making a lactamium based ionic liquid
comprising:
reacting a lactam compound having formula
wherein n is 1,
with a Brønsted acid HX; or a Brønsted acid HX, where X is a halide, and a metal halide; where the reaction product is a halide, or a halometallate.
3. The method of claim 2 wherein the lactam compound has the general formula (IV).
4. The method of claim 2 wherein the reaction takes place in a solvent.
5. The method of claim 4 wherein the solvent comprises water, toluene, dichloromethane, liquid carboxylic acids, alcohols, or combinations thereof.
6. The method of claim 2 wherein a ratio of the Brønsted acid HX to the lactam compound is about 1:1 to about 3:1.
7. A lactamium based ionic liquid, the ionic liquid having formula:
wherein n is 1, and X − is an anion group of a Brønsted acid HX or a halometallate, and wherein is X − is halide, or the halometallate.