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New γ-Lactone Carboxylic Acids from the Lichen Parmotrema praesorediosum ( Nyl . ) Hale , Parmeliaceae
From the lichen Parmotrema praesorediosum (Nyl.) Hale, Parmeliaceae, collected in Vietnam, five new (1, 2, 3, 5, 6) and one known (4) -lactonic acids were isolated. The structures of the newExpand
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Aggregation of alkyllithiums in tetrahydrofuran.
Density functional theory was used to examine the solvation number and aggregation state of several alkyllithium compounds in clusters with tetrahydrofuran molecules coordinated to each lithium atom.Expand
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Data report: stable carbon isotope fluctuation of long-chain n-alkanes from Leg 208 Hole 1263A across the Paleocene/Eocene boundary
Carbon isotope ratios of terrestrial biomarkers extracted from Ocean Drilling Program Hole 1263A show a prominent negative excursion across the Paleocene/Eocene boundary. The isotope profiles of theExpand
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A computational study of lithium enolate mixed aggregates.
Ab initio calculations were performed to examine the formation of mixed dimer and trimer aggregates between the lithium enolate of acetaldehyde (lithium vinyloxide, LiOV) and lithium chloride,Expand
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A computational study of halomethyllithium carbenoid mixed aggregates with lithium halides and lithium methoxide
Density functional theory calculations were used to examine the formation of lithium halide and lithium alkoxide mixed aggregates with halomethyllithium carbenoids. These mixed aggregates may be theExpand
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Leaving group effects in gas-phase substitutions and eliminations.
Using a methodology recently developed for studying the product distributions of gas-phase S(N)2 and E2 reactions, the effect of the leaving group on the reaction rate and branching ratio wasExpand
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Electronic structure of persistent radicals: nitroxides.
The molecular and electronic structures of 10 free nitroxide radicals have been investigated by HeI/HeII photoelectron spectroscopy (UPS), DFT calculations, and comparison with the spectra of relatedExpand
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Lignans and triterpenes from the root of Pseuderanthemum carruthersii var. atropurpureum.
Two new lignans, pseuderesinol (1), pseuderanoside (2) and a new triterpene, pseuderanic acid (3) were isolated from the dried root of Pseuderanthemum carruthersii (SEEM.) GUILL. var. atropurpureumExpand
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A computational study of lithium ketone enolate aggregation in the gas phase and in THF solution.
The aggregation state of several lithium enolates were calculated in the gas phase and in THF solution by the B3LYP DFT and MP2 methods. The gas phase free energies of aggregate formation wereExpand
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Intramolecular cyclization of enyne [3]cumulenals
Abstract Enyne [3]cumlenals have been shown to undergo a Bergman cyclization or an intramolecular [2+2] cycloaddition depending on the nature of substituents on the yne carbon. A hydrogen substitutedExpand
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