Browsing Chemistry by Date of Publication
Now showing items 1-20 of 1366
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Mechanisms of polymerisation of perchloric acid and related initiators
(Trinity College (Dublin, Ireland). School of Chemistry, 1969)Extract from Introduction: Man has made use of natural polymers such as rubber and cellulose from the earliest times, but not until the late nineteenth century did he begin to synthesise polymers and investigate their ... -
The chemistry and photochemistry of Ru(II) bipyridyl carbonyl complexes incorporated in Nafion
(Trinity College (Dublin, Ireland). School of Chemistry, 1991)The chemical reactions of bis(bpy)carbonylruthenium complexes, catalysts for the water gas shift reaction, have been investigated under mild conditions in Nafion, an ionic polymer. Chemical and photochemical reactions ... -
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. -
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 ... -
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 ... -
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 ... -
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 ... -
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. -
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 ... -
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[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 ... -
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 ... -
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 ... -
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. -
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 ... -
Furazano[3,4-d]pyrimidines and phosphazene pteridines as new tools in organic chemistry
(Trinity College (Dublin, Ireland). School of Chemistry, 1998)This thesis explores the use of 5,7-diaminofurazano[3,4-d]pyrimidine (64) (R = NH2) for the design of a pro-drug system which is stable in media of pH less than 5 but releases the active drug at pH values greater than 5. ... -
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 ...
