Showing papers in "Journal of The Chemical Society, Chemical Communications in 1993"
TL;DR: The ion exchange reaction of interlayer Na+ ions of a layered polysilicate kanemite with alkyltrimetnylammonium ions, followed by calcination, gives highly ordered mesoporous materials with a hexagonal array of uniform channels as mentioned in this paper.
Abstract: The ion exchange reaction of interlayer Na+ ions of a layered polysilicate kanemite with alkyltrimetnylammonium ions, followed by calcination, gives highly ordered mesoporous materials with a hexagonal array of uniform channels.
1,091 citations
TL;DR: C60 Fullerol with 24−26 hydroxy groups was synthesized directly by the reaction of fullerene with aqueous NaOH in the presence of tetrabutylammonium hydroxide (TBAH), the most effective catalyst as discussed by the authors.
Abstract: C60 Fullerol with 24–26 hydroxy groups was synthesized directly by the reaction of fullerene with aqueous NaOH in the presence of tetrabutylammonium hydroxide (TBAH), the most effective catalyst.
243 citations
TL;DR: Efficient solid-phase synthesis of dendritic α-thiosialoside inhibitors of influenza A virus haemagglutinin are described using hyperbranched L-lysine core structures.
Abstract: Efficient solid-phase synthesis of dendritic α-thiosialoside inhibitors of influenza A virus haemagglutinin are described using hyperbranched L-lysine core structures.
223 citations
TL;DR: The formation of Si-O-defect groups due to the incorporation of Ti in the framework of zeolites is evidenced by means of solid-state tetraethylammonium (TEA) cation exchange; a new assignment for the infrared (IR) band in both β-Ti and TS-1 is presented as discussed by the authors.
Abstract: The formation of Si–O–defect groups due to the incorporation of Ti in the framework of zeolites is evidenced by means of solid-state tetraethylammonium (TEA) cation exchange; a new assignment for the infrared (IR) band in both β-Ti and TS-1 is presented.
220 citations
TL;DR: This article showed that MCM-41 has a well defined mesoporous structure and is a highly promising model adsorbent, and showed that it is a well-suited adaption model for nitrogen and oxygen.
Abstract: Physisorption measurements of nitrogen and oxygen reveal that MCM-41 has a well defined mesoporous structure and is a highly promising model adsorbent.
215 citations
TL;DR: In this article, the reduction of gold(III) ions by tetrakis(hydroxymethyl)phosphonium chloride gives a hydrosol of gold clusters with mean diameter 1.5 nm (average nuclearity about Au170) and smaller.
Abstract: Reduction of gold(III) ions by tetrakis(hydroxymethyl)phosphonium chloride gives a hydrosol of gold clusters with mean diameter 1.5 nm (average nuclearity about Au170) and smaller.
208 citations
TL;DR: The functional photoswitchable systems 1, 3 and 12-15 display pronounced photochromic properties; the bis-pyridinium derivative 1 represents a prototype of a switched molecular wire which may be converted from an open unconjugated form to a closed electron-conducting state as discussed by the authors.
Abstract: The functional photoswitchable systems 1–3 and 12–15 display pronounced photochromic properties; the bis-pyridinium derivative 1 represents a prototype of a switched molecular wire which may be converted from an open unconjugated form to a closed electron-conducting state.
190 citations
TL;DR: Water-soluble rhodium-phosphane complexes are very efficient catalysts for the hydrogenation of carbon dioxide to formic acid in water-amine mixtures similar to those used for separation of CO2 from flue gases as discussed by the authors.
Abstract: Water-soluble rhodium-phosphane complexes are very efficient catalysts for the hydrogenation of carbon dioxide to formic acid in water–amine mixtures similar to those used for separation of CO2 from flue gases.
168 citations
TL;DR: A new amine protecting group which can be used orthogonally with both Fmoc and Boc protection is reported; by employing lysine protected appropriately as the branching motif, a 34 residue di-epitopic peptide has been constructed by continuous flow solid phase peptide synthesis.
Abstract: A new amine protecting group which can be used orthogonally with both Fmoc and Boc protection is reported; by employing lysine protected appropriately as the branching motif, a 34 residue di-epitopic peptide has been constructed by continuous flow solid phase peptide synthesis.
164 citations
TL;DR: The redox couple 1/2 as discussed by the authors represents an electro-photoswitching device displaying electrochemically reversible interconversion between a non-luminescent state and a luminescent one.
Abstract: The redox couple 1/2represents an electro-photoswitching device displaying electrochemically reversible interconversion between a non-luminescent state 1 and a luminescent state2.
147 citations
TL;DR: The decomposition of S-nitroso-N-acetyl D,L penicillamine (SNAP), an NO-donor drug, to give the disulfide and NO is catalysed by trace amounts of Cu2+ and Fe2+.
Abstract: The decomposition of S-nitroso-N-acetyl D,L penicillamine (SNAP), an NO-donor drug, to give the disulfide and NO is catalysed by trace amounts of Cu2+ and Fe2+.
TL;DR: In this article, the complete replacement of benzene rings with thiophene rings in a donor-acceptor substituted stilbene significantly enhances its second-order nonlinear optical hyperpolarizability.
Abstract: It is shown experimentally that the complete replacement of benzene rings with thiophene rings in a donor–acceptor substituted stilbene significantly enhances its second-order nonlinear optical hyperpolarizability (β); results obtained with a series of thiophene-substituted donor–acceptor compounds with different conjugation lengths reveal a power law dependence of βµ on the molecular conjugation length.
TL;DR: In this article, a 1 : 1 mixture of 5hexadecyl-2,4,6-triaminopyrimidine and 5,5 didodecylbarbituric acid was investigated by FTIR spectroscopy, TEM (transmission electron microscopy) and X-ray diffraction.
Abstract: A 1 : 1 mixture of 5-hexadecyl-2,4,6-triaminopyrimidine and 5,5-didodecylbarbituric acid can cause physical gelation in organic liquids; the gel phenomenon is investigated by FTIR spectroscopy, TEM (transmission electron microscopy) and X-ray diffraction.
TL;DR: The ylidic properties of 1,3,4,5,tetramethyl-2-methyleneimidazoline 4, obtained by deprotonation of the pentamethylimidazolium ion 3, are revealed both by its physical and chemical properties; the X-ray structure of 4 is reported as discussed by the authors.
Abstract: The ylidic properties of 1,3,4,5-tetramethyl-2-methyleneimidazoline 4, obtained by deprotonation of the pentamethylimidazolium ion 3, are revealed both by its physical and chemical properties; the X-ray structure of 4 is reported.
TL;DR: In this article, the reaction of an excess of iodine monochloride with C60, in either benzene or toluene at room temperature, gives a quantitative yield of C60Cl6, the 13C NMR spectrum of which indicates that it is isostructural with c60Br6.
Abstract: Reaction of an excess of iodine monochloride with C60, in either benzene or toluene at room temperature, gives a quantitative yield of C60Cl6, the 13C NMR spectrum of which indicates that it is isostructural with C60Br6.
TL;DR: N,O-Bis-Fmoc (fluoren-9-ylmethoxycarbonyl) derivatives of Nα-(2-hydroxy-4-methxybenzyl)amino acids 5 are useful intermediates for the preparation of peptides with reversibly protected peptide bonds; their value in inhibiting interchain association during solid phase peptide synthesis is demonstrated.
Abstract: N,O-Bis-Fmoc (fluoren-9-ylmethoxycarbonyl) derivatives of Nα-(2-hydroxy-4-methoxybenzyl)amino acids 5 are useful intermediates for the preparation of peptides with reversibly protected (tertiary) peptide bonds; their value in inhibiting interchain association during solid phase peptide synthesis is demonstrated.
TL;DR: Agelastatin A, isolated from the axinellid sponge Agelas dendromorpha of the Coral Sea, is a new-skeleton alkaloid with, unusually for the oroidin family to which it belongs, marked cytotoxicity toward tumour cells in culture.
Abstract: Agelastatin A, isolated from the axinellid sponge Agelas dendromorpha of the Coral Sea, is a new-skeleton alkaloid with, unusually for the oroidin family to which it belongs, marked cytotoxicity toward tumour cells in culture.
TL;DR: The cycloadducts of C60 and typical dienes have been isolated by HPLC, and the anthracene and cyclopentadiene adducts characterized by FAB mass and NMR spectroscopy.
Abstract: The cycloadducts of C60 and typical dienes have been isolated by HPLC, and the anthracene and Cyclopentadiene adducts characterized by FAB mass and NMR spectroscopy.
TL;DR: Experimentally measured second-order nonlinear hyperpolarizability (βµ) data for a new series of donor-acceptor conjugated compounds containing tricyanovinyl acceptors and thiophene conjugating units, reveal that this combination results in a dramatic enhancement (αµ= 6000−9000 × 10−48 esu) of their molecular nonlinearity as discussed by the authors.
Abstract: Experimentally measured second-order nonlinear hyperpolarizability (βµ) data for a new series of donor-acceptor conjugated compounds containing tricyanovinyl acceptors and thiophene conjugating units, reveal that this combination results in a dramatic enhancement (αµ= 6000–9000 × 10–48 esu) of their molecular nonlinearity.
TL;DR: In this paper, a dodecaruthenium macromolecule 11 employing ligand-metal-ligand connectivity was synthesized using 4′-chloro-2,2′ :6′,2″-terpyridine with the mono-and tri-hydroxylic cascade (dendritic) building blocks.
Abstract: Facile alkoxylation of 4′-chloro-2,2′ :6′,2″-terpyridine with the mono- and tri-hydroxylic cascade (dendritic) building blocks, 4-(3-hydroxypropyl)-4-(3-benzyloxypropyl)-1,7-bis(benzyloxy)heptane 4 and 4-amino-4-(3-hydroxypropyl)heptane-1,7-diol 3, has allowed the synthesis of a dodecaruthenium macromolecule 11 employing ligand–metal–ligand connectivity.
TL;DR: Alkali-mediated reaction of 5,10,15,20-tetrakis(3′,5′-dihydroxyphenyl)porphine with dendritic bromide gives the novel porphyrin covalently encapsulated into a huge dendrite cage (‘caged’ porphyrsin).
Abstract: Alkali-mediated reaction of 5,10,15,20-tetrakis(3′,5′-dihydroxyphenyl)porphine with dendritic bromide gives the novel porphyrin covalently encapsulated into a huge dendritic cage (‘caged’ porphyrin).
TL;DR: In this paper, the title catalyst was used to give the corresponding 1-arylethanols in up to 99% chemoselectivity and 94% enantiomeric excess.
Abstract: Hydroboration–oxidation of vinylarenes with the title catalyst gives the corresponding 1-arylethanols in up to 99% chemoselectivity and 94% enantiomeric excess.
TL;DR: In this paper, a general approach for the encapsulation of a variety of saturated polymers between the layers of MoS2 giving electrically conductive lamellar compounds is reported.
Abstract: A general approach for the encapsulation of a variety of saturated polymers between the layers of MoS2 giving electrically conductive lamellar compounds is reported.
TL;DR: In this article, a novel hydrogenation of carbon dioxide proceeds in with presence of a Ru3(CO)12-KI homogeneous catalytic system with successive formation of carbon monoxide, methanol and methane.
Abstract: A novel hydrogenation of carbon dioxide proceeds in with presence of a Ru3(CO)12–KI homogeneous catalytic system with successive formation of carbon monoxide, methanol and methane.
TL;DR: The Friedel-Crafts acylation of substituted benzenes proceeds smoothly by using a catalytic amount of a lanthanide trifluoromethanesulfonate [Ln(OTf)3], which is easily recovered from the reaction mixture and reused without a decrease in catalytic activity.
Abstract: The Friedel-Crafts acylation of substituted benzenes proceeds smoothly by using a catalytic amount of a lanthanide trifluoromethanesulfonate [Ln(OTf)3], which is easily recovered from the reaction mixture and reused without a decrease in catalytic activity.
TL;DR: In this paper, the volume filling of channels by capillary condensation without hysteresis is characterized by a new porous crystalline aluminosilicate from the family MCM-41.
Abstract: Adsorption isotherms of cyclopentane and nitrogen on a new porous crystalline aluminosilicate from the family MCM-41 are characterized by the volume filling of channels by capillary condensation without hysteresis, which commences in the region prior to the lower closure point at the hysteresis loop.
TL;DR: In this paper, the reaction in benzene of silyl hydrides (R3Si-H) with triphenylmethyl tetrakis(pentafluorophenyl)borate produces Silyl cations with reduced coordination to the anion.
Abstract: Reaction in benzene of silyl hydrides (R3Si–H) with triphenylmethyl tetrakis(pentafluorophenyl)borate produces silyl cations with reduced coordination to the anion.
TL;DR: In this article, back-to-back bis-terpyridine ligands of various lengths (Ru ⋯ Ru distances between 7 and 20 A) were used as bridges, and significant electronic coupling was observed in mixed-valence states.
Abstract: Dinuclear ruthenium(II) complexes have been prepared which contain back-to-back bis-terpyridine ligands of various lengths (Ru ⋯ Ru distances between 7 and 20 A) as bridges; significant electronic coupling is observed in mixed-valence states, even for the system with the longest separation.
TL;DR: In this article, several solvents for the dissolution of fullerenes and the efficacy of 1,2-dichlorobenzene and 1-methylnaphthalene for obtaining fullerene 13C NMR spectra were described.
Abstract: Described are several solvents for the dissolution of fullerenes and the efficacy of 1,2-dichlorobenzene and 1-methylnaphthalene for obtaining fullerene 13C NMR spectra.
TL;DR: New neutral ferrocene anion receptors L3, L4, L5 selectively complex, electrochemically recognise and respond to the dihydrogen phosphate guest anion in the presence of excess amounts of hydrogen sulfate and chloride anions as mentioned in this paper.
Abstract: New neutral ferrocene anion receptors L3, L4, L5 selectively complex, electrochemically recognise and respond to the dihydrogen phosphate guest anion in the presence of excess amounts of hydrogen sulfate and chloride anions.