Mesitylene tricarbonyl chromium

It was found that the benzene, toluene, mesitylene, durene and hexamethylbenzene tricarbonyl chromium could best be separated and quantitatively determined in mixtures by use of temperature programming with the flame ionization detector. Figure 204 illustrates the separation achieved. It can be seen that the resolution is excellent, and that the retention times of the early components are far enough removed from the tail of the solvent peak that measurements from the original base line are possible in each case. Under isothermal conditions (135°C) using flame ionization, the benzene tricarbonyl--chromium and toluene tricarbonylchromium peaks eluted on the tail of the benzene peaks and the retention time of the hexamethylbenzene tricarbonylchromium was 32.6 minutes. This peak was also considerably broader and flatter when eluted isothermally. For this determination therefore, programmed temperature operation is the most efficient means of analysis not only is the resolution improved, but also the total time of analysis is reduced to 15 minutes. 

Gas chromatographic separation of FTC, BTC, MTC, MBTC, (fluorobenzo, benzene, mesitylene, and methyl benzoate tricarbonyl chromium complexes). 

At constant temperature on the SE-30 column, the separation of para- and meta-xylenetricarbonylchromiums is poor the complexes of orthoxylene and ethylbenzene are eluted in the same time and are not completely resolved from the mesitylene complex. The selectivity of the Apiezon L column is greater for the xylene derivatives and the separation of o-xylene and ethylbenzene complexes is improved but the resolution of mesitylene- and pseudocumeme-tricarbonyl-chromiums is bad. Figure 215 shows a chromatogram of a benzene solution of the thirteen derivatives, obtained at 140°C with a SE-30 column. 

The formation of the inclusion compounds was selective. /3-CD formed 1 1 inclusion compounds with benzene, toluene, and o-xylene chromium tricarbonyl complexes, and not with w-xylene, />-xylene, guaiacol, methyl anthrani-late mesitylene, or hexamethylbenzene chromium tricarbonyl complexes. Whereas a-CD did not form inclusion complexes with any arene chromium complexes, 7-CD formed 1 1 inclusion complexes with all arene chromium... 

An overview of the effect of catalyst in the reaction of arenes with chromium hexacarbrmyl has been published. The reactivity of 17-, 18-, and 19-etectron catkMis generated electrochemically from mesitylene-tungsten tricarbonyl has been examined. The gas phase ion chemistry of a range of arene tricarbonylchromium complexes has been investigated by F.T. mass spectrometry. An improved synthesis of substituted naphthalene chromium carbonyls has appeared. ... 

Resolution of o and m-substituted benzylalcohol chromium tricarbonyls by reduction of the corresponding aldehydes using bakers yeast has been achieved. The regioselective complexation of 1,2 9,10-dibenzo[2.2]paracyclophane-1,9-diene with Cr(CX))3 has been described. The diasteteoselective nuclec hilic 1,2-addition reactions of N-benzylidene-1--methylaniline chromium tricarbonyl has been achieved. A range of hetetobimetallic complexes of substituted mesitylene chromium iricarbonyls has been prepared. ... 

Tricarbonyl(6,6-diphenylfulvene)chromium(0) (52) was obtained by reaction of 6,6-diphenylfulvene with hexacarbonylchromium in 64% yield [56]. Later it was shown that almost quantitative yields can be obtained under photochemical reaction conditions starting from (benzene)Cr(CO)3 or from (mesitylene)Cr(CO)3 as the complexation reagent [63]. The corresponding molybdenum and tungsten complexes were prepared by treatment of the ligands with tris(acetonitrile)M(CO)3 (M = Mo, W) [64]. Olefin complex 53 was obtained by Wilkinson and Altman in 51% yield from 6,6-diphenylfulvene and bis(dicarbonylchlororhodium). Similar complexes were prepared with other rhodium reagents [58]. Hiibel and Weiss [59] prepared the diene tri-carbonyliron complex 54 (11-30%) in addition to the dinuclear complex, in which either one of the endocyclic double bonds is coordinated at Fe(CO)4 (49-66%). 

---