@article {2352, title = {An Improved Synthesis of Pyridine-Thiazole Cores of Thiopeptide Antibiotics}, journal = {Journal of Organic Chemistry}, volume = {74}, number = {15}, year = {2009}, note = {ISI Document Delivery No.: 476XOTimes Cited: 4Cited Reference Count: 29Aulakh, Virender S. Ciufolini, Marco A.}, month = {Aug}, pages = {5750-5753}, type = {Article}, abstract = {The oxidation of 2-methylthiazoles to 2-formylthiazoles simplifies the implementation of the Bagley variant of the Bohlmann-Rahtz reaction as a key step in a concise new route to pyridine cores of thiopeptide antibiotics.}, keywords = {1ST, AMYTHIAMICIN-D, CONSTRUCTION, GE2270-A, KEY BUILDING-BLOCKS, macrocycle, MICROCOCCIN P1, ONE-POT, PROMOTHIOCIN, SYNTHESIS, THIOSTREPTON}, isbn = {0022-3263}, url = {://000268480300104}, author = {Aulakh, V. S. and Ciufolini,Marco A.} } @article {1067, title = {Preparation of [meso-tetraphenylchlorophinato]nickel(II) by stepwise deformylation of [meso-tetraphenyl-2,3-diformyl-secochlorinato]nickel(II): conformational consequences of breaking the structural integrity of nickel porphyrins}, journal = {Inorganica Chimica Acta}, volume = {358}, number = {10}, year = {2005}, note = {ISI Document Delivery No.: 941PBTimes Cited: 10Cited Reference Count: 66}, month = {Jun}, pages = {2943-2953}, type = {Article}, abstract = {The stepwise, Wilkinson{\textquoteright}s catalyst-induced decarbonylation of [meso-tetraphenyl-2,3-diformylsecochlorinato]Ni(II) (4) to produce the monoformylated pigment [meso-tetraphenyl-2-formylsecochlorinato] (5) and [meso-tetrapheiiylchlorophinato]Ni(II) (6) is described. Thus, we have shown how to degrade one pyrrolic unit of the starting material, [meso-tetraphetiylporphyrinato]Ni(II) (2) in three steps to an aldimine linkage. The conformational changes of the porphyrinic macrocycle during the course of this degradation, as determined by comparison of the X-ray crystal structures of the compounds, are discussed. A comparative study delineates the UV-Vis spectroscopical consequences. In addition, the chemical reactivity of [meso-tetraphenylchlorophinato]Ni(II) (6) suggests the existence of an azepine-derived pyrrole-modified porphyrins (11, 12). (c) 2004 Elsevier B.V. All rights reserved.}, keywords = {CHEMISTRY, CHIRALITY-MEMORY MOLECULE, CHLORIN, CHLOROPHIN, chlorophins, COMPLEXES, ELECTRONIC-SPECTRA, macrocycle, METHYLCOENZYME-M REDUCTASE, nickel(II) porphyrin conformations ruffling, porphyrins, secochlorins, SYSTEM, TUNICATE TRIDIDEMNUM-SOLIDUM, Wilkinson{\textquoteright}s catalyst}, isbn = {0020-1693}, url = {://000230225600013}, author = {Bruckner, C. and Hyland, M. A. and Sternberg, E. D. and Macalpine, J. K. and Rettig, S. J. and Patrick, B. O. and Dolphin, D.} } @article {581, title = {3,3 {\textquoteright}-Dipyrrolyl sulfides, useful building blocks for the syntheses of macrocycles containing dipyrromethene units}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {81}, number = {9}, year = {2003}, note = {ISI Document Delivery No.: 721MBTimes Cited: 1Cited Reference Count: 18}, month = {Sep}, pages = {988-991}, type = {Article}, abstract = {5,5{\textquoteright}-Dicarboxy-3,3{\textquoteright}-dipyrrolyl sulfide was condensed with 5,5{\textquoteright}-diformyl-3,3{\textquoteright}-dipyrrolyl sulfide or 5,5{\textquoteright}-diformyldipyrromethane under acidic conditions to produce, in high yields, macrocycles containing four dipyrromethene units.}, keywords = {3, 3-dipyrrolyl sulfide, cyclopolypyrrole, dipyrromethene, EXPANDED PORPHYRINS, EXTRUSION, macrocycle}, isbn = {0008-4042}, url = {://000185319200004}, author = {Chen, Q. Q. and Dolphin, D.} } @article {582, title = {Cyclooctapyrroles, novel macrocycles containing biladiene-a,c units}, journal = {Tetrahedron}, volume = {59}, number = {6}, year = {2003}, note = {ISI Document Delivery No.: 641ZPTimes Cited: 1Cited Reference Count: 26}, month = {Feb}, pages = {871-875}, type = {Article}, abstract = {Cyclooctapyrroles, novel macrocycles containing two biladiene-a,c units, were synthesized in high yield from the condensation of 3,3{\textquoteright}-dipyrromethanes with 5,5{\textquoteright}-diformyl-2,2{\textquoteright}-dipyrromethane under acidic conditions. These macrocycles form dinuclear complexes with zinc(H). (C) 2003 Elsevier Science Ltd. All rights reserved.}, keywords = {biladiene-ac, BUILDING-BLOCK, CALIXPYRROLES, cyclooctapyrrole, cyclopolypyrroles, dipyrromethene, EXPANDED PORPHYRINS, macrocycle}, isbn = {0040-4020}, url = {://000180777200020}, author = {Chen, Q. Q. and Dolphin, D.} } @article {617, title = {Dinuclear organometallic dinitrogen complexes of niobium}, journal = {Inorganica Chimica Acta}, volume = {345}, year = {2003}, note = {ISI Document Delivery No.: 653EUTimes Cited: 4Cited Reference Count: 30}, month = {Mar}, pages = {53-62}, type = {Article}, abstract = {{The niobium(III) chloride precursors (R)[P2N2]NbCl stabilized by the bis-(amidophosphine) macrocycle (where (R)[P2N2] RP(CH2SiMe2NSiMe2CH2)(2)PR}, keywords = {ACTIVATION, amidophosphine ligands, AZOBENZENE, CLEAVAGE, CRYSTAL-STRUCTURE, CRYSTALLOGRAPHY, DINITROGEN COMPLEXES, END-ON, FIXATION, fluxionality, macrocycle, macrocycles, N-2, NIOBIUM, NITRIDE, SIDE-ON}, isbn = {0020-1693}, url = {://000181422900008}, author = {Fryzuk,Michael D. and Kozak, C. M. and Patrick, B. O.} } @article {616, title = {Reduction of hafnium(IV) complexes in the presence of molecular nitrogen: Attempts to form dinitrogen complexes of the heaviest group 4 element}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {81}, number = {11}, year = {2003}, note = {ISI Document Delivery No.: 746YXTimes Cited: 10Cited Reference Count: 28}, month = {Nov}, pages = {1376-1387}, type = {Article}, abstract = {The reaction of [P2N2]Li-2(dioxane)(2) with HfCl4(THF)(2) (where [P2N2] = PhP(CH2SiMe2NSiMe2CH2)(2)PPh) results in the formation of the hafnium dichloride complex [P2N2]HfCl2 (1). The behaviour of 1 as a potential precursor in the generation of a dinitrogen coordination complex is described. Reduction of 1 with potassium-graphite (C8K), under dinitrogen, under a variety of conditions led to a number of products, one of which is the dinuclear derivative with bridging P-phenyl groups that has the general formula {[P2N2]Hf}(2) (2). Reduction of the hafnium diiodide [P2N2]HfI2 (3) - prepared via the reaction of 1 with excess Me3SiI - with C8K results in the formation of ([P2N2]Hf)(2)(mu-eta(2):eta(2)-N-2) (4) as the major product of the reaction, while {[P2N2]Hf}(2) (2) and [P2N2]Hf(C7H8) (5) appear to be minor products. Reaction of 1 with 2 equiv of MeMgCl gives [P2N2]HfMe2 (6), which, upon exposure to an atmosphere of H-2, gives the hafnium tetrahydride {[P2N2]Hf}(2)(m-H)(4) (7).}, keywords = {COORDINATION CHEMISTRY, DERIVATIVES, DINITROGEN, donor ligands, FLUXIONAL BEHAVIOR, hafnium, hydride, macrocycle, mixed, {ALKYL}, isbn = {0008-4042}, url = {://000186777600031}, author = {Fryzuk,Michael D. and Corkin, J. R. and Patrick, B. O.} } @article {5034, title = {A highly efficient preparation of N-confused cyclodecapyrroles}, journal = {Tetrahedron Letters}, volume = {42}, number = {19}, year = {2001}, note = {ISI Document Delivery No.: 427KUTimes Cited: 4Cited Reference Count: 33}, month = {May}, pages = {3263-3265}, type = {Article}, abstract = {Cyclodecapyrroles, potential novel host systems, were synthesized in 78-88\% yields by condensation of tripyrrane dialdehyde with bis(5-carboxyl-2,4-dimethyl-pyrrole-3-yl)-methane, ethane, and -propane in the presence of HBr and TFA. (C) 2001 Elsevier Science Ltd. All rights reserved.}, keywords = {3, 3 {\textquoteright}-dipyrromethane, ANION SENSORS, CALIXPYRROLES, CYCLOOCTAPYRROLES, cyclopolypyrrole, EXPANDED PORPHYRINS, HOST, macrocycle, macrocycles, METAL-COMPLEXES, TRIPYRRANE}, isbn = {0040-4039}, url = {://000168404000006}, author = {Chen, Q. Q. and Dolphin, D.} } @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 {4544, title = {Synthesis and characterization of Group 13 hydrides and metal-metal bonded dimers stabilized by the macrocyclic bis(amidophosphine) ligand [P2N2] ([P2N2] = [PhP(CH2SiMe2NSiMe2CH2)2PPh])}, journal = {Journal of Organometallic Chemistry}, volume = {591}, number = {1-2}, year = {1999}, note = {ISI Document Delivery No.: 263HDTimes Cited: 8Cited Reference Count: 39}, month = {Dec}, pages = {63-70}, type = {Article}, abstract = {Addition of LiAlH4 to the monomeric chlorides syn-MCl[P2N2] (M = Al (1), Ga (2), In (3)) results in the formation of the aluminum hydride syn-AlH[P2N2] (4). The solution H-1- and P-31{H-1}-NMR spectra are consistent with a C-20 symmetric species in solution. The X-ray crystal structure shows the hydride to be monomeric, and free from interaction with either salt (LiCl) or external base (Et2O). The coordination of both phosphines of the macrocycle to the metal center is found in the solid state. Solution molecular weight measurements are consistent with a monomeric structure. The gallium hydride syn-GaH[P2N2] (5) is synthesized by the addition of LiGaH4 to syn-MCl[P2N2] (M = Ga (2), In (3)). This species is unstable and could only be characterized in solution. Reduction of syn-MCl[P2N2] (M = Ga (2), In (3)) with KC8 yields the reduced, dimeric species {syn-M[P2N2]}(2) (M = Ga (6), In (7)). The solution H-1- and P-31{H-1}-NMR spectra are consistent with C-2v symmetric species in solution. The X-ray crystal structures of the gallium and indium complexes confirm the presence of unsupported metal-metal bonds in both cases. The features of the solution H-1- and P-31{H-1}-NMR spectra suggest that both dimers are fluxional in solution. (C) 1999 Elsevier Science S.A. All rights reserved.}, keywords = {AL-AL, aluminum, CHEMISTRY, CRYSTAL-STRUCTURE, GA-GA, gallium, GALLIUM-GALLIUM BONDS, hydride, indium, INDIUM HYDRIDE, macrocycle, METAL-METAL BONDS, MOLECULAR-STRUCTURE, NEUTRAL COMPLEXES, SUBSTITUTED DIGALLANE}, isbn = {0022-328X}, url = {://000084118500007}, author = {Fryzuk,Michael D. and Giesbrecht, G. R. and Rettig, S. J. and Yap, G. P. A.} } @article {3626, title = {The unexpected formation of a tetradentate tripyrrolic complex of nickel(II)}, journal = {Chemische Berichte}, volume = {129}, number = {10}, year = {1996}, note = {ISI Document Delivery No.: VN636Times Cited: 1Cited Reference Count: 25}, month = {Oct}, pages = {1195-1198}, type = {Article}, abstract = {(2-Pyrolylmethane)(2-pyrrolylmethyl)imine (2) and an equimolar amount of 2-formylpyrrole give, in the presence of nickel (II) in hot methanol, the novel tripyrrolic nickel(II) complex [SP-4]-[(2-dipyrrinato-kappa(2)N,N{\textquoteright}-methyl)(2-pyrrolylmethanato-kappa N{\textquoteright}{\textquoteright}{\textquoteright}imine-kappa N{\textquoteright}{\textquoteright}{\textquoteright}]nickel(II) (4). This planar complex had been characterized by X-ray crystallography, a mechanism for its formation is proposed and its mass spectral behavior is discussed.}, keywords = {CHEMISTRY, imine hydrolysis, macrocycle, PORPHOCYANINE, pyrrolic nickel(II) complexes, template effect}, isbn = {0009-2940}, url = {://A1996VN63600008}, author = {Bruckner, C. and Mar, E. K. and Rettig, S. J. and Dolphin, D.} }