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The photolysis of m-phenylene-bis(chlorodiazirine) in the presence of 2-vinylpyridine (VP) yields the m-phenylene-bis(indolizine) by a mechanism involving two consecutive photoreactions. Photolysis of a first diazirine ring generates a carbene which reacts with 2-VP to give, via a sequence of fast t...
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Gorgonian corals have proven to be a prolific source of a variety of biologically active terpenes. Corals of the genus Plexaurella are known to be the source of a diverse array of sesquiterpenes, and past reports have indicated variability in terpene content. This study involved an examination of th...
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2,2'-Pyridyl- and 2,2'-thienylpyrroles containing substituents at the 1- and 3-positions of the pyrrole ring have been prepared from the reaction of heteroarylchlorocarbenes with 1-azabuta-1,3-dienes. Laser flash photolysis of heteroarylchlorocarbene in isooctane in the presence of 1-azabu...
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The ecteinascidins are a family of tetrahydroisoquinoline alkaloids isolated from the tunicate Ecteinascidia turbinata. Ecteinascidin 743 is a candidate for the treatment of several human cancers. Ecteinascidins have been shown to kill tumor cells in vitro, inhibit tumor growth in vivo, suppress all...
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Host-guest interactions between alpha- and beta-cyclodextrins and nickel(II) polyazamacrocycles bearing aliphatic pendant arms (n-butyl, n-octyl and n-dodecyl) have been investigated, using redox kinetics as a probe, to estimate binding constants. Electrospray mass spectrometry shows the formation o...
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The binuclear complex bis-(chloropalladium(II))-tetrakis(2-pyridyl)pyrazine chloride, [Pd2Cl2(tppz)]Cl-2 has been synthesized and characterized. The complex shows solvatochromic behaviour in aqueous DMSO solvent mixtures. The kinetics of nucleophilic substitution of the complex by guanine is reporte...
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The close association between marine invertebrates, zooxanthellae, and numerous bacteria gives rise to the question of the identity of the actual producer of secondary metabolites. In fall of 2005, a widespread bleaching event occurred throughout the Caribbean Sea in which some colonies of the gorgo...
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A novel molecular AND logic gate 1 is demonstrated based on the competition between fluorescence and photoinduced electron transfer (PET). It is constructed according to a 'receptor(2)-spacer-fluorophore-spacer-receptor(1)-spacer-fluorophore-sp acer-receptor(2)' format where receptor, is a tertiary ...
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Two dialkyl peroxides, devised as kinetic probes for the heterogeneous electron transfer (ET), are studied using heterogeneous and homogeneous electrochemical techniques. The peroxides react by concerted dissociative ET reduction of the O-O bond. Under heterogeneous conditions, the only products iso...
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Various methods for the enhancement of the fluorescence of the pesticide azinphos-methyl are reported. The addition of hydroxypropyl-beta-cyclodextrin was found to moderately enhance the fluorescence by a factor of three, presumably via inclusion of the pesticide into the cyclodextrin cavity. This c...
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The effect of the macrocyclic host compounds cucurbit[n]urils (Qn), with n = 5 - 7, on the fluorescence of the biologically active compound curcumin has been studied. Curcumin, the main constituent of the Indian spice turmeric, is of growing interest because of its wide-ranging pharmaceutical proper...
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The pendant-arm macrocycle, meso-5,5,7,12,12,14-hexamethy 1,4,8,11-tetraazacyclotetradecane- 1,8-di-(1-methylnaphthalene) has been synthesized and its single crystal structure determined. The molecule crystallizes in a primitive monoclinic cell, with the space group P2(1)/a (#14). The cell dimension...
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The crystal structure and electron density of 3-[(p-nitrophenoxy)methyl]-3-chlorodiazirine have been analyzed using single crystal X-ray diffraction at 208 K with Mo K alpha radiation to a resolution of sin(theta(max))/lambda = 1.126 Angstrom(-1). A total of 10 440 measured reflections gave 7742 uni...
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The fatty acid synthase from Bugula neritina has been purified 100-fold using ammonium sulfate precipitation, ion-exchange and size exclusion chromatography. The purified enzyme has a molecular weight of approximately 382,000 Da, as judged by gel filtration. Polyacrylamide gel electrophoresis under ...
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Abstract: Synthetic pathways to several salts of the anion [Cp*2ZrH3]- have been developed. Reaction of Cp*2ZrH2 (3) prepared from [Cp*2Zr(N2)]2(-N2) (2), with KH in THF, afforded [Cp*2ZrH3]K (1) in a 74% yield. In a similar manner, addition of LiH gave [Cp*2ZrH3]Li (4). While this synthetic pathway...
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Cyclobutenbriarein A (2), a novel class of C20-rearranged diterpene briarane possessing an unprecedented tricyclo[8.4.0.0(3,6)]tetradec-4-ene ring system was isolated, along with five new briarane diterpenoids (1 and 3-6), from the organic extracts of the Bahamian gorgonian Briareum asbestinum. The ...
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