1: With potassium tert-butylate; tert.-butyl lithium in tetrahydrofuran; dichloromethane; pentane T=-78°C; 1 h; Inert atmosphere; 2: With p-toluenesulfonyl chloride in tetrahydrofuran; dichloromethane; pentane T=-78 - 20°C; 2 h; Inert atmosphere;

aluminium trichloride; sodium thiosulfate in n-heptane 2 equiv. AlCl3, heated to 100°C and stirred under N2 for 5 h; cooled, added with stirring to ice-cold H2O, soln. of Na2S2O3 added, layers septd., aq. layer washed with ether and organic layer with H2O, dried (MgSO4), examinated by VPC;

byproducts: chloroferrocene; treating the Fe-compd. with C2Cl6; column chromy., dissolved in CH2Cl2, excess of anhydrous FeCl3 added, stirred for 1.5 h under N2, water added, organic layer separated, dried (MgSO4), evapd., recrystd. twice from light petroleum (b.p. 40-60°C);

aluminium trichloride; aluminium; benzene in benzene 3 equiv. AlCl3, heated to 100°C, stirred under N2 for 5 h; cooled, added with stirring to ice-cold water, layers separated, aq. layer washed with ether and organic layer with H2O, dried (MgSO4), evapd.,chromy. on alumina with light petroleum/CH2Cl2, rechromy. on silica, crystd. from MeOH or light petroleum;

aluminium trichloride; aluminium; benzene in benzene 2 equiv. AlCl3, heated to 100°C, stirred under N2 for 5 h, cooled, added with stirring to ice-cold water, layers separated, aq. layer washed with ether and organic layer with H2O, saturated aq. NH4PF6 soln. added; salt pptd. (repptd. from acetone/ether or column chromy. on alumina with acetone/CH2Cl2, crystd. from MeOH), soln. dried (MgSO4), evapd., chromy. on alumina with light petroleum/CH2Cl2, rechromy. on silica, crystd. from MeOH or light petroleum;

aluminium trichloride; aluminium in 1,2,5-trimethyl-benzene 2 equiv. AlCl3, heated to 100°C, stirred under N2 for 5 h; cooled, added with stirring to ice-cold H2O, layers septd., aq. layer washed with ether and organic layer with H2O, dried (MgSO4), evapd., chromy. on alumina with light petroleum/CH2Cl2, rechromy. on silica, crystd.(MeOH or l. petroleum), elem. anal.;