NOVELTY - Mixture having a freezing point of up to 100 degrees C formed by a process, comprises: contacting 1-2 equivalents of substituted halo aluminum compound (1a) with 1 equivalent of substituted keto compound (1b).    USE - The process is useful to form a mixture having a freezing point of up to 100 degrees C, which is useful: as a solvent and/or an electrolyte for carrying out an electrolytic reaction, as a reagent and catalyst; for electrodepositing aluminum metal onto a conductive substrate; and for electrodepositing an alloy of aluminum with another metal onto a conductive substrate (all claimed). The mixture is useful: as a solvent to dissolve metal-containing ionic compounds (e.g. metal salts and metal oxides), and as solvent systems for inorganic and organic compounds, in solvent systems where chemical reactions are performed, and into solvent system, where compounds are extracted from an immiscible fluid phase; as electrolytes in electrochemical devices (batteries or fuel cells), in photovoltaic or electrochromic devices, and as electrolytes/solvents for electrochemical reactions (e.g. electrochemical deposition, electropolishing and electro-refining); and as a Lewis acid catalyst in reactions (a Friedel-Crafts reaction (reaction between aromatic groups and alkyl or acyl halides), cycloaddition reaction (e.g. a Diels Alder reaction (coupling of a diene to a dienophile) or 1,3-dipolar cycloaddition), Fischer indole synthesis (cyclization of aryl hydrazones), polymerization of an olefin, Mukaiyama aldol addition (addition of a silyl enol ether to an aldehyde), McMurry reaction (coupling of two aldehyde or ketone groups to form an alkene) and a Baylis-Hillman reaction (coupling of an aldehyde and an alkene having an electron-withdrawing group attached to an unsaturated C-atom of the alkene functional group)).    ADVANTAGE - The mixture: is a low temperature mixture; is easy and/or cheap to prepare, has a lower freezing point, is less viscous, more conductive and less dense, and/or has a lower surface tension, compared to conventional ionic mixtures which are liquid at low temperatures; provides stabilized form of (1a); is much easier and/or safer to handle and/or store (e.g. they have a reduced need for the strict use of anhydrous conditions for the utilization and/or storing); provide a simple, low temperature system from which electrodeposition or electroplating of aluminum metal (or alloy) can be obtained; and provides aluminum metal or alloy with low energy consumption and/or with a reduced need for high temperature containment materials, as it employs mild conditions.    DETAILED DESCRIPTION - Mixture having a freezing point of up to 100 degrees C formed by a process, comprises: contacting 1-2 equivalents of substituted halo aluminum compound of formula (AlX3) (1a) with 1 equivalent of substituted keto compound of formula (R1-C(O)-N(R2)(R3)) (1b).    X = Cl, Br or F;    R1 = 1-4C alkyl (optionally substituted by F) or -N(H)R4;    R4 = H or 1-4C alkyl (optionally substituted by F); and    R2, R3 = 1-6C alkyl (optionally substituted by F), H or aryl.    INDEPENDENT CLAIMS are also included for:    (1) a mixture formed by a process, comprising: contacting 1-2 equivalents of (1a), with 1 equivalent of (1b); and contacting the mixture so formed with an additive;    (2) a method of carrying out an electrolytic reaction, comprising: employing the mixture as a solvent and/or as an electrolyte for the electrolytic reaction;    (3) a method of electrodepositing aluminum metal onto a conductive substrate, comprising: contacting the substrate and a counter electrode with the mixture; and electrolyzing the mixture by applying a reducing potential to the substrate, relative to the counter electrode; and    (4) a method of electrodepositing onto a conductive substrate an alloy of aluminum with another metal, comprising: contacting the substrate and a counter electrode with the mixture containing an additive that comprises, in a positive oxidation state, a metal other than aluminum; and electrolyzing the mixture by applying a reducing potential to the substrate, relative to the counter electrode.