Zinc , tetrabenzo

In another metal-mediated coupling reaction, the highly functionalized dienes 136a and 136b were allowed to react with Ni(PPh3)4 in the presence of excess zinc/copper couple at 50 ""C and 1 atm of carbon monoxide to provide the octakis(methoxycarbonyl) 137a and the tetrabenzo derivatives 137b in excellent yields (77 and 84%, respectively), (see Scheme 17 compare also Scheme 12 for the formation of the related [4]radialene 10686-88) 373 s treated with excess LiBr H2O in HMPA at temperatures... 

Contrary to the majority of phthalocyaninatometal complexes, tetrabenzo-porphyrinatometal complexes have to be prepared from tetrabenzoporphyrin TBPH2 by treatment with metal salts in a suitable solvent. The preparation of tetrabenzoporphyrin mostly follows one of the routes given in Scheme 2. Tetrabenzoporphyrinatozinc (TBPZn) is prepared first [7]. Subsequent removal of zinc from TBPZn e.g. by treatment with trifluoroacetic acid leads to TBPH2 [8]. 

C 4H3iFeN402f Aquohydroxyirondll) tetraphenylporphine, 29, 617 C44H32N402Zn, Zinc tetraphenylporphine dihydrate, 29, 617 C44H36lN4Ni 0.08 I, 1,4,5,8,9,12,13,16-Octamethyl-tetrabenzo-por-phinato-nickeKlI ) iodide (partially oxidized), 46B, 502... 

C28Hi6B2F8N4Pd, Tetrabenzo[b,f,j,n][l,5,9,l3]tetraazacyclohexadec-inepalladatedl) bis(tetraf luoroborate), 45B, 1199 C2 bHi6Fe2N408Zn2, (2,2 -Bipyridyl)zinc-tetracarbonyliron(Fe-Zn),... 

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