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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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A general method for the synthesis of some arylated phenylsulphonylacetonitriles 6a–g, 10a, b and 16 and ethyl cyanoacetates 7a-d and 11a, b is described. Nucleophilic substitution of the cyclopentadienyliron complexes of chloroarenes 1a–g with phenylsulphonylacetonitrile 2 or ethyl cyanoacetate...
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Isomeric dichlorobenzene complexes of ironcyclopentadienyl and pentamethylcyclopentadienyl- ruthenium were used to facilitate nucleophilic arom. substitution (SNAr) reactions with a variety of O, S, and N contg. nucleophiles. Oligomeric and polymeric systems were achieved by variation in the ratio o...
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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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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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Hydride and cyanide addn. to di- and polycyclopentadienyliron arene complex cations with etheric bridges is described. Reaction of the di-Fe complexes with NaBH4 gave a no. of adducts. P-Methyl- and o,o-dimethylphenoxybenzene cyclopentadienyliron complexes were used as models in this study to allow ...
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Marine invertebrates have proven to be a rich source of secondary metabolites. The growing recognition that marine microorganisms associated with invertebrate hosts are involved in the biosynthesis of secondary metabolites offers new alternatives for the discovery and development of marine natural p...
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Single-electron oxidation of the known Cr(II) bis(amidinate) Cr[(Me3SiN)2CPh]2 (1) provides synthetic access to neutral Cr(III) complexes. The complexes Cr[(Me3SiN)2CPh]2X were prepared by reaction of 1 with AgO2CPh (X = O2CPh, 2), of 1 with iodine in THF (X = I/THF, 3), or of 1 with iodine in penta...
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Double nucleophilic substitution of 1,2-, 1,3-, or 1,4-(HO)2C6H4 with [(η5-C5H5)Fe(η6-C6H5Cl)]+ PF6- (anion assumed) and K2CO3 in THF/DMF afforded the corresponding bis(cyclopentadienyliron) arom. ether complexes I, isolated as PF6- salts. Compds. I and biphenyl analogs were prepd. in 70-95% y...
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Chemical studies on the non polar fraction of the methanolic extract of Pseudopterogorgia elisabethae Bayer collected from the Florida Keys has yielded 12-acetoxypseudopterolide (1), a new diterpene of the pseudopterane series. The structure was established through spectroscopic analysis. Compound (...
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Preparations of iron(II) complexes of bi-, tri-, quadri-, quinque-, and sexi-dentate Schiff bases are reported. The Schiff-base ligands are derived from pyridine-2-carbaldehyde, phenyl 2-pyridyl ketone, pyridine-2,6-dicarb-aldehyde. or 2,6-diacetylpyridine, and appropriate amines. All these complexe...
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Cyclic aryl ethers, thioethers or amines, and methods for synthesis are disclosed. These cyclic aryl compounds are synthesized by combining a first dinucleophile with a substituted benzene metallized electron-withdrawing complex, having halo or nitro substituent groups, to form a linear bimetallized...
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Nucleophilic aromatic substitution of isomeric chlorotoluenes complexed to the cyclopentadienyliron moiety with ethyl cyanoacetate in the presence of K2CO3 in DMF results in the formation of the isomeric ethyl tolylcyanoacetate complexes. Photolysis of these complexes leads to the formation of the t...
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The pseudopterosins are a family of diterpene glycosides isolated from the gorgonian coral Pseudopterogorgia elisabethae. These metabolites exhibit potent anti-inflammatory activity, and this review describes our efforts to elucidate their biosynthetic origin. A radioactivity-guided isolation was us...