Browsing Chemistry (Scholarly Publications) by Date of Publication
Now showing items 1-20 of 890
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Boride cluster fusion via an M4-unit (M=Cu, Ag): molecular structure of [PPN][{Ru4H(CO)12B}2Cu4(m-Cl)][Cl]
(1992)The reaction of [ppn][Ru4H(CO)12BH] with [Cu(MeCN)4][BF4] in the presence of [ppn][Cl] yields [ppn][{Ru4H(CO)12B}2-Cu4(?-Cl)][Cl], which has been structurally characterised; the introduction of silver in place of copper ... -
Structural Evidence for Nonplanar Keto- and Planar Enol-Forms of Oxophlorins
(Royal Society of Chemistry, 1992)The first structural investigation of a zinc(II) and a free-base oxophlorin reveals considerable conformational differences between the keto-(1) and enol-form (2) of oxophlorins. -
A Novel 2,18-Bridged Biliverdin Derivative
(Royal Society of Chemistry, 1993)Base-catalysed dehydrohalogenation of a 3,18-bis(2-chloroethyl)biliverdin 1 affords a novel 3-vinylbiliverdin 3 in which the 2- and 18-positions are bridged with a propano-tether; the structure of 3 has been established ... -
Tricarbonyl (h6-pyridine)chromium (0)
(1994)The molecular structure of tricarbonyl(rl6-pyridine) - chromium(0), [Cr(CO)3(C5H5N)], is presented here. The Cr atom is bound to the pyridine ring via the 7r-electron system and is situated dir ... -
Axial Coordination Phenomena in Highly Substituted Porphyrins. Crystal Structure of the Polymeric (2,3,7,8,12,13,17,18-Octaethyl-5,10,15,20-tetranitroporphyrinato)zinc(II), [{Zn(oetnp)}n]
(Royal Society of Chemistry, 1994)The polymeric structure of the sterically strained and non-planar porphyrin [{ZnIIoetnp}n] is determined by X-ray crystallography; polymerization is achieved by utilization of the nitro-groups for axial ligation to the ... -
Syntheses, Structure, Properties, and Chemistry of 1,1-Di(pyrrolyl)ethenes
(Royal Society of Chemistry, 1994)Reaction of a 2-unsubstituted pyrrole with acetic anhydride and stannic chloride unexpectedly promotes self-condensation to give symmetrical di( pyrroly1)ethene as a side-product in &lo% yield, but overall yields of these ... -
Crystal Structure of a Remarkably Ruffled Nonplanar Porphyrin - (Pyridine)(5,10,15,20-Tetra(tert-butyl)porphyrinato)zinc(II)
(Royal Society of Chemistry, 1995)The title compound presents the first example of a sterically ruffled porphyrin bearing only meso substituents; the degree of ruffling is severe, with Cm-displacements of up to 1 ?. -
Mono- and di-dentate tertiary phosphine and monodentate tertiary phosphite derivatives of [Ru4H(CO)12BH2]
(1995)The reaction of the butterfly cluster [Ru4H(CO)12BH2] with a range of tertiary phosphines and diphosphines and with a large excess of trimethyl phosphite have been explored. Twenty-two derivatives of the general types ... -
Synthesis and crystal structures of cofacial bischlorins - Octaethylchlorin-based structural models for the special pair in photosynthesis
(Royal Society of Chemistry, 1996)McMurry coupling of metalloformyloctaethylchlorins yields the first cofacial bischlorin with structural characteristics mimicking those of the special pair in photosynthesis. -
Formation of polyheterocyclic systems by reaction of 2-imino-4-methyl-2H-1-benzopyran-3-carbonitrile with active methylene compounds
(1996)2-Imino-4-methyl-2H-1-benzopyran-3-carbonitrile undergoes [1,5] tautomerism in solution to 2-amino-4-methylidene-4H-1-benzopyran-3-carbonitrile. Reaction with one equivalent of compounds containing a reactive methylene ... -
Bis(methanol-O)(2,3,7,8,12,13,17,18-octaethylporphyrinato-N,N',N",N'")-iron(III) Perchlorate Bis(methanol) Solvate, [Fe(III)oep(HOCH3)2][ClO4].2CH3OH
(International Union of Crystallography, 1996)Simple treatment of [FeIII(oep)Cl] (where oep is octaethylporphyrin) with dilute perchloric acid leads to facile preparation of the title compound, [Fe(C36H44N4)(CH4O)2](ClO4).2CH4O. The structure consists of discrete ... -
Bis[anhydro-meso-rhodochlorinato XV methyl ester)zinc(II)]
(International Union of Crystallography, 1997)The title compound bis[(methyl 8,13-diethyl-2,21,22,23-tetrahydro- 3,7,12,17-tetramethyl-23-oxo-3H-benzo[at]porphyrin-18-carboxylato-Kappa4N)- zinc(II)], [Zn(C33H34N4O3)]2, has similar structural characteristics to the ... -
Formation of Polysubstituted Pyridin-2-one Derivatives by Michael Addition of 3-Oxobutanamide to ?,?-Ethylenic Ketones and Amides
(1997)Reaction of 3-oxobutanamide with 4-phenylbut-3-en-2-one and with 3-aryl-2-cyanoprop-2-enamides and related compounds affords new di-, tetra- and hexa-hydropyridin-2-one derivatives, the degree of unsaturation of the product ... -
Structure and Conformation of Photosynthetic Pigments and Related Compounds. 10. Comparison of a Phytochlorin and Phytoporphyrin Derived from Chlorophyll a
(International Union of Crystallography, 1997)The crystal and molecular structures of 17-decarboxyethyl-131-deoxo-17-propylphytochlorin, C33H40N4, (1), and phytoporphyrin methyl ester, C34H36N4O3, (2), are compared. Compound (1) shows structural parameters similar to ... -
Structure and Conformation of Photosynthetic Pigments and Related Compounds. 11. 5,10,15,20-Tetrabutylbacteriochlorin
(International Union of Crystallography, 1998)The structure of the title compound, C36H50N4, is the first example of a tetra-meso-substituted free-base bacteriochlorin (2,3,12,13-tetrahydroporphyrin). While general structural characteristics are similar to other ... -
Synthesis and 13C NMR assignment of ammonium benzylidenepropanedioates and benzylidenepropanediamides
(1998)Mono- and di-ammonium benzylidenepropanedioates are synthesised, the molecular structure of a mono-ammonium salt confirmed by X-ray diffraction, and the 13C NMR spectra of the salts and the related benzylidenepropanediamides ... -
Reactions of 2-Oxo-2H-1-benzopyran-3-carbonitrile
(1998)Synthetic reactions of2-oxo-2H -1-benzopyran-3-carbonitrile afford productswhich establish that partial or complete cleavage of the startingmaterial occurs in the course of reaction. -
7-Nitro-5,10,15,20-tetraphenylporphyrin Dichloromethane Solvate
(International Union of Crystallography, 1998)The title compound shows significant conformational distortion in the vicinity of the [beta]-nitro group. This is attributed to steric interaction between a meso-phenyl and the [beta]-nitro group. The overall degree of ... -
The N-carbamoyl squaramide dimer: A compact, strongly associated H- bonding motif
(1999)N-Carbamoyl squaramides 3, readily available from dialkyl squarate 5, form hydrogen-bonded dimers in solution and in non-polar organic solvents; in CDCl3 they show no significant dissociation down to concentrations of ?0.5 mM. -
Nitrile and non-nitrile pyridine products from the reaction of 2-cyano- 3-(x-nitrophenyl)prop-2-enamides with methyl 3-oxobutanoate
(1999)The reaction of 2-cyano-3-(x-nitrophenyl)prop-2-enamides with methyl 3-oxobutanoate affords methyl 4-aryl-3-cyano-6-methyl-2-oxo-1,2-dihydropyridine-5-carboxylates, methyl 4-aryl-5-cyano-2-hydroxy-2-methyl-6-oxopiperidin ...
