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issue	11
is Is Part Of of	Potential energy barriers for halogen six-center reactions: semiempirical valence-bond predictions Spin trapping alkylperoxy radicals, and superoxide-alkyl halide reactions Model studies of the biosynthesis of non-head-to-tail terpenes. Stereochemistry of ionization for N-methyl-4-[(1S,1'R,3'R)-[1-2H]chrysanthemyloxy]pyridinium iodide Microenvironment within a solid-phase cosolvent Competing triplet and radical pair fluorine-19 polarizations in the electron transfer quenching of triplet .alpha.,.alpha.,.alpha.-trifluoroacetophenone Simultaneous occurrence of a chair and a boat conformation in crystalline cycloheximide A totally synthetic bilayer membrane Direct measurement of the lifetimes of the 3B1 state of sulfur dioxide in air at atmospheric pressure Additoins and Corrections - Optically Active Amines. XVIII. Spectral Observation on Optically Active N-Substituted Pyrroles. Concerted non-least-motion pathway for the singlet methylene insertion reaction CH2(1A1) + H2 .fwdarw. CH4 Asymmetric photolysis of (RS)-leucine with circularly polarized ultraviolet light Reversible linkage isomerisms of .beta.-diketonato ligands. Oxygen-bonded and carbon-bonded structures in gold(III) acetylacetonate complexes induced by phosphines Cyclizations via organopalladium intermediates. Macrolide formation The detection of optical activity in chemiluminescence Additions and Corrections - Idealized Polytopal Forms. Description of Real Molecules References to Idealized Polygons or Polyhedra in Geometric Reaction Path Form An ESR study of the acid dissociation of imidogen protons. 2. Cyclic peptide radicals and related radicals Kinetics and mechanism of apparent alkyl transfer from alkylcobaloximes to cobaloxime(I), cobaloxime(II), and cobaloxime(III) reagents Low-temperature infrared studies of some chloroethylene-ozone reactions Intramolecular nucleophilic attack of carboxyl on amides. The metal ion inhibited hydrolysis of N-(2-pyridyl)phthalamic acid and N-(2-phenanthrolyl)phthalamic acid EXAFS: approximation, parameterization, and chemical transferability of amplitude functions Interaction of metal ions with 8-azapurines. 3. Synthesis and structure of trichloro(8-azaadeninium)zinc(II) Bifunctional proton transfer and acid-base properties of 1,4,7,10-tetraazacyclododecane (cyclen) o-(Dimethylaminomethyl)benzyl alcohol. An improved model for serine esterases that is internally hydrogen bonded in aqueous solution Stereochemistry of the SN2' reaction. "Concerted" allylic displacement in an acyclic system: anti displacement with thiolate anion Structure of bis[ethylenediamine(5'-cytidine monophosphate)platinum] dihydrate. An example of direct platinum-phosphate bonding Organic reactions of oxide-free carbon surfaces, an electroactive derivative Additions and Corrections - Conformational Studies on Peptides. X-Ray Structure Determinations of Six N-Methylated Cyclic Dipeptides Derived from Alanine, Valine, and Phenylalanine. Masthead A molecular orbital study of protonation. 2. Pyridine and the diazines The chemical evolution of a nitrogenase model. 14. Stoichiometric reactions of complexes of molybdenum(V), molybdenum(IV), and molybdenum(III) with acetylene and nitrogen Model studies of the biosynthesis of non-head-to-tail terpenes. Rearrangements of the chrysanthemyl system Photochemical synthesis of low-valent organothorium complexes. Evidence for photoinduced .beta.-hydride elimination Templated syntheses of cyclic acetylacetone hosts, their affinities for divalent ions, and an example of a slow proton transfer from enol to hydroxide ion A novel class of molecular complexes: lithium-ammonia, lithium-water, lithium-hydrofluoric acid, lithium-hydrogen sulfide, sodium-water, and sodium-hydrofluoric acid Electron photodetachment from negative ions of C2v symmetry. Electron affinities of allyl and cyanomethyl radicals Benzidine rearrangement. 14. The nitrogen kinetic isotope effect in the acid-catalyzed rearrangement of hydrazobenzene Studies on the syntheses of heterocyclic compounds. 700. Syntheses of isoquinoline alkaloids with cuprous chloride and oxygen in pyridine as an enzymic model Isomerization of (Z)-arenediazo thioethers on aldolase and model compounds Photochemical synthesis. 67. Mechanism of enone photoannelation: activation energies and the role of exciplexes High-pressure high-resolution nuclear magnetic resonance. Pressure dependence of the ring proton chemical shifts of substituted benzenes Cyclophanes. 9. anti-[2.2](2,6)Azulenophane. Synthesis and charge-transfer interaction Total synthesis of humulene. A stereoselective approach 2,2-Dimethylisoindene and 5,5-dimethylbenzobicyclo[2.1.0]pent-2-ene Low resolution microwave spectroscopy. 5. Rotational isomerism of propargyl cyanoformate, propargyl trifluoroacetate, propargyl fluoroformate, and propargyl chloroformate Spectroscopy of radical cations. The McLafferty rearrangement product in fragmentation of n-butylbenzene and 2-phenylethanol ions Energy transfer from luminescent transition metal complexes to oxygen Extent of charge separation in suddenly polarized twisted excited states of linear polyenes A synthetic tetranuclear iron-sulfur complex with ionized side chains: the crystal structure of (Fe4S4(S(CH2)2COO)4)6-.(Na5.N(C4H9)4)6+.5C5H9NO Cation-anion combination reactions. 14. Reactions of [p-(dimethylamino)phenyl]tropylium ion with nucleophiles in water and methanol Demonstration of an octasaccharide repeating unit in the extracellular polysaccharide of Rhizobium meliloti by sequential degradation Demonstration and analysis of bridging regioselectivity operative during di-.pi.-methane photorearrangement of ortho-substituted benzonorbornadienes and anti-7,8-benzotricyclo[4.2.2.02,5]deca-3,7,9-trienes Chemistry of organosilicon compounds. 98. Photochemical generation of silacyclopropene Nitrogen-15 nuclear magnetic resonance studies of porphyrins Activation through impregnation. Permanganate-coated solid supports Denial of the proposed structure of salamander alkaloid, cycloneosamandaridine. Total synthesis of cycloneosamandione and supposed cycloneosamandaridine Triboluminescence spectroscopy of aromatic compounds Molecular motion of fluorocinnamates Propellanes. 16. Bridgehead olefin formation via 11,11-dihalo[4.4.1]propellane solvolysis The preparation and reactions of nickelocyclopentanes Additions and Corrections - Nucleophilic Attacks on Carbon-Nitrogen Double Bonds. 3. Diversity of Mechanisms for the Substitution of Diarylimidoyl Chlorides by Amines in Acetonitrile. Vinylic radicals are intermediates in the oxidation of vinylic lithium reagents to lithium enolates by dioxygen, but not by lithium tert-butyl peroxide Model studies of the biosynthesis of non-head-to-tail terpenes. Stereochemistry of the head-to-head rearrangement Acid catalyzed CIDNP [chemically induced dynamic nuclear polarization] during photoinduced electron transfer Stereochemistry of the SN2' reaction in cyclohexenyl systems Reactions in dry media. A simple conversion of nitro groups into carbonyls Control by meta substituents of benzo-vinyl bonding options during triplet sensitized photorearrangement of benzonorbornadienes and anti-7,8-benzotricyclo[4.2.2.02,5]deca-3,7,9-trienes A crown ether NAD(P)H mimic. Complexation with cations and enhanced hydride donating ability toward sulfonium salts A theoretical study of the structure of cyclobutadiene Ion-molecule reaction chemistry of various gas-phase C6H6 radical cations Production of hydrogen by ultraviolet irradiation of tetrasulfatodimolybdate(4-) ion in aqueous sulfuric acid. Electronic absorption spectrum of tripotassium tetrasulfatodimolybdate-3.5-water at 15 K The proton affinities of phenol Phosphorus-nitrogen-boron heteroring systems. Preparation of methylaminobis(difluorophosphine)diborane(4) Additions and Corrections - Structure and Absolute Configuration of Strictamine and Strictalamine from Rhazya stricta. Stereochemistry of the Picralima Alkaloids. Application of photoelectron spectroscopy to intramolecular hydrogen bonding. 5. The x-ray photoelectron spectra of cis- and trans-2-substituted cyclanols The mechanism of chemical ionization of n-paraffins Nuclear magnetic resonance investigation of magnetic and electronic properties of "intermediate spin" ferrous porphyrin complexes 1,2-Diarylethylene-diene exciplexes. Solvent-induced changes in chemical and physical processes Isoenergetic hydride transfer. A reversible, phase transition mediated tRNA modification Additions and Corrections - Hydration of NH4F Nuclear magnetic resonance conformational analysis of 1,4-dihydronaphthalenes The crystal and molecular structure of chloro-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatomanganese(III) The carbonyl scrambling processes in the isomeric pentacarbonylguaiazulenediiron and homologous ruthenium molecules; a novel mechanism for the internuclear processes Solvolysis of haloallenes. The effect of added salts on the polarimetric and titrimetric rates of solvolysis of 1-bromo-3-methyl-1,2-pentadiene EXAFS: a new parameterization of phase shifts A quadruply hydrogen-bridged metal-metal bond. The neutron diffraction analysis of octahydridotetrakis(diethylphenylphosphine)dirhenium(IV) Temperature dependent electron spin resonance spectra of cyclohexadienyl and silyl-substituted cyclohexadienyl radicals. The conformation of the radicals Additions and Corrections - Proton Magnetic Resonance Studies of sym-Oxepin Oxide. Solution conformation of the ferrichromes. 10. Peptide strain. Conformation dependence of the carbon-13 nuclear magnetic resonance chemical shifts in the ferrichromes Nucleophilic substitution reactions of pentafluorosulfur and tetrafluoro(trifluoromethyl)sulfur halides Cation-anion combination reactions. 15. Rates of nucleophilic aromatic substitution reactions in water and methanol solutions The Hartree-Fock theory of local regions in molecules Simple prediction of substituent sensitivity (.rho.+) for carbocations Hydridorhodium(III) porphyrin and porphyrin rhodium(II) dimer A direct measurement of dynamic spin-interconversion rates in the spin-equilibrium protein ferric myoglobin hydroxide

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