Al; AlCl3 in tetrahydrofuran; ethylene glycol dimethyl ether (under Ar, Schlenk); flask charged with Al, AlCl3, ligand added, stirredat room temp. for 1 h, CrCl3 added, heated at 120°C for 5 h, coo led, mixt. of THF-DME added, refluxed for 8 h, cooled to room temp.; ppt. filtered, washed with heptane, solvent removed in vacuo, ppt. extd.with heptane, filtered, heptane stripped off, solid sublimed at 105.deg ree.C/0.01 mmHg;

in 2-methyl cyclohexane according to the method by E. P. Kuendig and P. L. Timms, J. Chem. Soc., Chem. Commun. (1977) 912; J. Chem. Soc. Dalton Trans. (1980) 991 in a rotating solution reactor described by E. P. Kuendig and C. Perret, Helv. Chim. Acta, 64 (1981) 2606; recrystd. from pentane;

aluminium trichloride; water redn. Friedel-Crafts synthesis; final hydrolsysis, redn. at 140 °C, in presence of Al;

aluminium trichloride at 130 °C;

in neat (no solvent) cocondensation of chromium vapour with neat mesitylene in a rotary metal atom reactor; resulting frozen matrix is allowed to thaw in vac., soln. filtered through Celite, evapd. to dryness; Cr(C6H3Me3)2 sublimed at 65-70°C, residue (Cr2(C6H3Me3)3) recrystd. from petroleum ether at -30°C;

methyl iodide in hexane

methyl iodide in hexane under ice cooling, hydrolysis, M ratio of (m-CH3C6H4CH3)2Cr, (p-CH3C6H4CH3)2Cr and (2.3.5-(CH3)3C6H3)2Cr=11:13.2:3.8:7.3; chromy.;

Al/AlBr3; Na2S2O4/KOH in neat (no solvent) homogenizing of CrBr3, Al and AlBr3 (N2 atmosphere), mesitylene addn., stirring (room temp., 14 h), solvolysis (H2O/MeOH/petroleum ether, ice cooling), water/methanolic phase redn. (Na2S2O4/KOH/benzene); benzene phase sepn., drying (KOH), evapn., recrystn. (THF, -80°C), sublimation;

water redn. Friedel-Crafts synthesis; final hydrolsysis, redn. at 45 °C;

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