@article {4493, title = {A novel stepwise degradation of porphyrins. Synthesis and structural characterization of meso-tetraphenylchlorophinato nickel(II) and meso-tetraphenylsecochlorinato nickel(II)}, journal = {Journal of the American Chemical Society}, volume = {121}, number = {11}, year = {1999}, note = {ISI Document Delivery No.: 180AUTimes Cited: 27Cited Reference Count: 33}, month = {Mar}, pages = {2609-2610}, type = {Article}, keywords = {CARBAPORPHYRINS, CLEAVAGE, DERIVATIVES, FLEXIBILITY, HYDROPORPHYRINS, macrocycle, SYSTEM}, isbn = {0002-7863}, url = {://000079363300039}, author = {Bruckner, C. and Sternberg, E. D. and Macalpine, J. K. and Rettig, S. J. and Dolphin, D.} } @article {4215, title = {Formation of a meso-tetraphenylsecochlorin and a homoporphyrin with a twist}, journal = {Journal of Organic Chemistry}, volume = {63}, number = {7}, year = {1998}, note = {ISI Document Delivery No.: ZH679Times Cited: 40Cited Reference Count: 41}, month = {Apr}, pages = {2094-2098}, type = {Article}, abstract = {The osmium tetroxide-mediated dihydroxylation of meso-tetraphenylporphyrin leads to the formation of the vic-diol meso-tetraphenyl-2,3-vic-diol-2,3-chlorin. The corresponding Ni(II) complex was converted by lead tetraacetate into (meso-tetraphenyl-2,3-secochlorinato-2,3-dialdehyde)nickel(II) This novel pigment undergoes an almost quantitative, intramolecular double acetal formation when treated with methanol in the presence of acid to produce a porphyrinoid in which one pyrrolic unit is formally replaced by a six-membered ring. An X-ray crystal structure determination, the first for such a homoporphyrin, reveals the severely twisted conformation of its chromophore.}, keywords = {beta, CHLOROPHIN, HYDROPORPHYRINS, OXIDATION, PORPHYRIN ANALOG, SYSTEM}, isbn = {0022-3263}, url = {://000073136500012}, author = {Bruckner, C. and Rettig, S. J. and Dolphin, D.} }