A NEW AND CONVENIENT METHOD FOR THE PREPARATION OF 2,7-DIHYDRO-1H-DIBENZO[C,E]TELLUREPIN - REACTIONS AND LIGAND PROPERTIES

Treatment of 2,2'-bis(bromomethyl)biphenyl with potassium tellurocyana te in dry DMSO gave 1,7-dihydro-1H-dibenzo[c,e]tellurepin (1) in 60% y ield as an unexpected product. The following new derivatives of 1 have been prepared: C14H12TeCl2 (2), C14H12TeBr2 (3), C14H12TeI2 (4), C14H 12Te(CH3)I (5) and C14H12Te(C2H5)I (6). Mononuclear and dinuclear pall adium complexes [i.e. (C14H12)(2)PdCl2 (7) and [(C14H12Te)PdCl2](2) (8 )] were prepared by the reaction of 1 with PdCl2(PhCN)(2) and Na2PdCl4 , respectively. Reaction of RhCl3 . 3H(2)O with an excess of 1 gave th e monomeric Rh(I) complex, (C14H12Te)(3)RhCl (9). Compound 1 readily f orms a 1:1 charge-transfer complex with TCNE while it reduces the carb onyl groups in DDQ and TCQ to hydroxyl groups. Conductivity, UV-Vis, I R and H-1- and C-13-NMR data for the new compounds are presented and d iscussed.