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issue	5
is Is Part Of of	The conformations and energetics of simple ylides A novel synthesis of .beta.-lactams Structure of the reaction barrier in the selenoxide-mediated formation of olefins Isotope enrichment by photolysis on ordered surfaces A new geometrical form for tin. Synthesis and structure of the tetramethylammonium chloride adduct of the spirobis(dithiastannole) [(CH3)4N]+[(C7H6S2)2SnCl]- Nitrogen-15 NMR spectrum of a 1,1-diazene. N-(2,2,6,6-tetramethylpiperidyl)nitrene Reactions of (9-anthryl)arylmethyl chloride and its homologs with nucleophiles under solvolytic conditions. Notable effects of reaction conditions and substituents on the reaction sites Intramolecular catalysis of organic oxidation and reduction reactions: rapid and microscopically reversible thioether-sulfoxide interconversions in dilute acid A stable monocyclic triarylalkoxy P-H phosphorane, a 10-P-5 species with an apical phosphorus-hydrogen bond, and its conjugate base, a phosphoranide Binuclear copper complexes: an open and shut case. A strong antiferromagnetically coupled .mu.-monohydroxo bridged complex Laser-desorption mass spectrometry/mass spectrometry and the mechanism of desorption ionization Preparation of aluminoborane analogs of the lower boron hydrides Tetraneopentyltitanium as a polymerization catalyst Useful impurities for optical resolutions. 1. Crystallization of photopolymerizing dienes in the presence of their chiral topochemical products Transformation of coordinatively unsaturated .eta.1-vinylmolybdenum complexes into three-electron .eta.2-bonded cyclic alkylidene species Luminescence and redox photochemistry of the molybdenum(II) cluster Mo6Cl142- Secondary deuterium/hydrogen isotope effects on carbon-13 chemical shifts in cycloalkanes. Downfield shifts over three and four bonds Free radical induced nuclear magnetic resonance shifts: comments on contact shift mechanisms Unusual platinum complexes of deprotonated 1-methylcytosine: bis(.mu.-1-methylcytosinato-N3,N4)-bis(cis-diammineplatinum(II)) dinitrate dihydrate, [(NH3)2Pt(C5H6N3O)2Pt(NH3)2](NO3)2.2H2O, and [diaquahydrogen(1+)][bis(.mu.-1-methylcytosinato-N3,N4)-bis(cis-nitrodiammineplatinum)(Pt-Pt) dinitrate, (H5O2)[(NH3)2(NO2)Pt(C5H6N3O)2Pt(NH3)2(NO2)](NO3)2 Substitution reactions of alkanesulfonyl derivatives: direct substitution vs. elimination-addition mechanisms in substitution reactions of alkyl .alpha.-disulfones Mechanism of the Fischer-Tropsch reaction. The chain propagation step C-20 Stereospecific introduction of a steroid side chain Permanganate ion oxidations. 13. Soluble manganese(IV) species in the oxidation of 2,4(1H,3H)-pyrimidinediones (uracils) First ionization band of 1,1-dimethylsilaethylene by transient photoelectron spectroscopy Crystal and molecular structure of BBM-928 A, a novel antitumor antibiotic from Actinomadura luzonensis Useful impurities for optical resolutions. 3. An improved Pasteur-type resolution of conglomerates and a new empirical method for assignment of absolute configuration A highly stereoselective synthesis of transepoxides via arsonium ylides Ejection dynamics and electronic processes governing secondary particle emission in SIMS The optical activity of the three-membered ring: oxiranes, aziridines, diaziridines, and oxaziridines Solvatochromic comparison method. 20. Linear solvation energy relationships. 12. The d.delta. term in the solvatochromic equations Metal atom syntheses of metallaboron clusters. 2. Synthesis of cobaltathiaborane and cobaltadithiaborane complexes. Crystal and molecular structures of 2,3,6-(.eta.-C5H5)2Co2SB5H7 and 7,6,8-(.eta.-C5H5)CoS2B6H8 Limits on the expression of enzyme-mediated solvent isotope effects Concerted ring-opening reaction of cyclobutenes. The extraordinary accelerating effects of arylsulfoxy and sulfonyl carbanion substituents Masthead Reversed micelles of Aerosol-OT in benzene. 2. Equilibrium studies using vapor pressure osmometry and spectrophotometry with picric acid as indicator High-resolution optical studies on C-phycocyanin via photochemical hole burning Long-range triplet-triplet energy transfer within metal-substituted hemoglobins Photochemistry of metal-metal bonded complexes: one-electron oxidation of photogenerated seventeen-valence-electron radicals A new and efficient total synthesis of streptonigrin Time-resolved resonance Raman spectroscopy: the triplet state of all-trans-retinal Isolation of a (carbon, nitrogen)-bonded formamido complex and its isomerization to a (carbon, oxygen)-bonded form on the edge of a triosmium cluster. Crystal and molecular structure of a urethane derivative of the (carbon, nitrogen)bonded formamido complex Quadrupolar carbon-13-nitrogen-14 couplings and nitrogen-14 relaxations in aggregated and nonaggregated choline phospholipids Fermi level pinning of p-type semiconducting indium phosphide contacting liquid electrolyte solutions: rationale for efficient photoelectrochemical energy conversion New syntheses and molecular structures of the decamethylmetallocene dicarbonyls (.eta.5-C5Me5)2M(CO)2 (M = titanium, zirconium, hafnium) Synthesis and complexation properties of macrocyclic polyethers derived from chiral and meso-1,1'-bicyclohexyl-2,2'-diols Interaction of pyruvate-thiamin diphosphate adducts with pyruvate decarboxylase. Catalysis through "closed" transition states New reaction chemistry of cis-diammineplatinum with .alpha.-pyridone crystalline relatives of cis-diammineplatinum .alpha.-pyridone blue NMR investigation of a surface compound on colloidal silica Photoinduced electron-transfer reactions. Radical cations of norbornadiene and quadricyclene Dianions of 2-methyl-2-butene: evidence for the stability of a Y-aromatic species Storage of electrons in aqueous solution: the rates of chemical charging and discharging the colloidal silver microelectrode Electroorganic chemistry. 46. A new carbon-carbon bond forming reaction at the .alpha.-position of amines utilizing anodic oxidation as a key step Carbon-13 NMR spectra of the uranyl tricarbonate-bicarbonate system Reversed micelle of Aerosol-OT in benzene. 3. Dynamics of the solubilization of picric acid Triboluminescence-structure relationships in polymorphs of hexaphenylcarbodiphosphorane and anthranilic acid, molecular crystals, and salts General-acid catalysis of imidazolidine ring opening. The hydrolysis of ethyl N,N'-[1-(p-(dimethylamino)phenyl)propenediyl]-p-[((2-tetrahydroquinolinyl)methylene)amino]denzoate A possible nucleophilic ipso-aromatic substitution with a benzyl anion as the leaving group Chemistry of singlet oxygen. 34. Unexpected solvent deuterium isotope effects on the lifetime of singlet molecular oxygen (1.DELTA.g) Synthesis of 16-membered-ring macrolide antibiotics. 4. Carbomycin B and leucomycin A3: total synthesis of cyclic key intermediate 1,1-Dimetalloalkenes containing aluminum as well as titanium or zirconium. Their structures and use as novel alkenylidene and alkenyl transfer agents Facile cleavage of the molybdenum.tplbond.molybdenum bond in reactions between Mo2(OBut)6 and aryl azides and molecular oxygen 9-Naphthylmethylenecyclooctatrienyl anions. Conformational analysis and bond rotation Chromium(II)-polypyridyl complexes: formation, spectra, and electron-transfer kinetics Reversible dioxygen binding by a totally synthetic nonporphyrin macrobicyclic iron(II) complex containing a persistent void Formate ion as a monodentate ligand. Synthesis, structure, and decarboxylation of (.eta.5-cyclopentadienyl)dicarbonyl(formato)iron Nanosecond flash studies of reduction of benzophenone by aliphatic amines. Quantum yields and kinetic isotope effects Metal-nitroxyl interactions. 20. Electron paramagnetic resonance spectra of spin-labeled vanadyl and silver porphyrins Isolation and structures of trichilins, antifeedants against the Southern army worm Cyclopropylidene radical anion and 1,4-elimination-type remote ionization effect in the reduction of bi(gem-dihalocyclopropane) systems Nonconcertedness of allylic cation promoted .pi.-cyclization reactions Photoatropisomerization of "picket-fence" porphyrins and their metal complexes Gas-phase oxidation catalysis by transition-metal cations Relatively high-yield syntheses of rotaxanes. Syntheses and properties of compounds consisting of cyclodextrins threaded by .alpha.,.omega.-diaminoalkanes coordinated to cobalt(III) complexes Vibrational spectra of twist-boat cyclohexane Oxygen-17 NMR studies of substituent and hydrogen-bonding effects in substituted acetophenones and benzaldehydes Synthesis and structure proof of a vitamin D3 metabolite, 25(s),26-dihydroxycholecalciferol Monomeric metaphosphate anion: reaction with carbonyl groups Exo stereoselectivity in electrophilic attack on bicyclo[4.3.1]decatetraenyl anion and in deprotonation of tricyclo[4.3.1.0]deca-2,4,7-triene Chiral discrimination in the energetics of ion aggregation Structures of BBM-928 A, B, and C. Novel antitumor antibiotics from Actinomadura luzonensis Useful impurities for optical resolutions. 2. Generality and mechanism of the rule of reversal Linking of four acetylene molecules at a dimolybdenum center and the protonation of the resulting metallacyclononatetraene to form a cation containing a bridging MoHC system Stepwise reduction of carbon monoxide to methane on a triosmium cluster face. Preparation and characterization of undecacarbonyl(methylene)triosmium Anion receptor molecules. Synthesis and anion-binding properties of polyammonium macrocycles Chemiluminescence of dioxetanone investigated by self-consistent-field theory Eigenfunctions of open-shell molecules: experimental spin densities in hexafluorochromate(3-) and tetrachlorocobaltate(2-) Book Reviews Carbon-13 NMR spectroscopic study of the application of the "tool of increasing electron demand" to the 7-aryl-1-norbornenyl, 7-aryl-7-norbornyl, 2-aryl-2-bicyclo[2.1.1]hexyl, 1-aryl-1-cyclobutyl, and 3-aryl-3-nortricyclyl cations A new molybdenum(IV) thioanion containing the Mo:St unit. Synthesis and structural characterization of bis(tetraethylammonium) nonathiomolybdate Synthesis of 16-membered-ring macrolide antibiotics. 3. Carbomycin B and leucomycin A3: retrosynthetic studies Photoreduction of 5-bromouracil. Ionic and free-radical pathways Improvement of energy conversion efficiency by specific chemical treatments of molybdenum selenide (n-MoSe2) and tungsten selenide (n-WSe2) photoanodes Cyclen phosphonium and homologous cations. Dimerization in strained PN4+ systems Solvent dependence of the kinetics of formation and dissociation of cryptate complexes

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