Roy W. King

Anastrephin and epianastrephin, novel lactone components isolated from the sex pheromone blend of male caribbean and mexican fruit flies

Anastrephin and epianastrephin, novel lactone components isolated from the male produced pheromone of two Anastrepha fruit fly species (Caribbean and Mexican) are assigned the structure and relative stereochemistry 1 and 2, respectively, on the basis of spectroscopic and chemical evidence including synthesis.

Dislodgeable residues of ethion in Florida citrus and relationships to weather variables

Five different treatments of ethion on Valencia orange trees were compared for decay rates and for ethion monoxon and ethion dioxon production under different environmental conditions. The oxon metabolite levels observed were low and always below the residue level of ethion itself. There were no significant differences in the decay rates of ethion between treatments.A model of ethion decay utilizing environmental variables as a time base is presented. This model explains 94% of the variation observed in ethion decay during very wet and very dry periods in Florida.The application of these results and general experimental approach to worker safety reentry standards is discussed.

Addition of methanol to endo-tricyclo[3.2.1.02,4]oct-6-ene: a probe of cyclopropyl corner vs edge protonation

Abstract Deuterium labelling experiments have shown that acid catalysed reaciton of endo -tricyclo[3.2.1.02,4]oct-6-ene with methanol proceeds exclusively by cyclopropyl corner protonation followed by skeletal rearrangement to an allylic ion and formation of 2- exo -methoxybiocyclo[3.2.1]oct-3-ene.

Incorporation of molecular oxygen into caffeic acid by green Helianthus annuus

Abstract The results of experiments in which Helianthus annuus were grown in the light in an atmosphere enriched with oxygen-18 indicated that the hydroxyl oxygen atoms in caffeic acid are derived from molecular oxygen.

Identification of the products of solvolysis of N-benzylpyridinium cations in the absence of nucleophiles

Mono-, tri-, and penta-cyclic N-benzylpyridinium tetrafluoroborates undergo thermolysis in chlorobenzene as solvent to give products of benzylation both of the solvent and of the pyridine leaving group. Thermolysis alone, and in nitrobenzene as solvent, yielded mainly products of benzylation of the leaving group. The results support the previously postulated mechanism of unimolecular solvolysis of compounds of these types in non-polar solvents.

Nucleophilic displacement with heterocycles as leaving groups. Part 16. Reactions of secondary alkyl primary amines with 5,6,8,9-tetrahydro-7-phenyldibenzo[c,h]xanthylium trifluoromethanesulphonate to give intermediates solvolysing without rearrangement

Representative secondary alkyl primary amines R1 R2CHNH2 react with the title pyrylium cation in acetic acid, alcohols, phenols, and NN-dimethylaniline acting as nucleophilic solvents to give O- and C-(secondary alkyl) products. Absence of carbenium ion rearrangements is consistent with reaction via intimate ion–molecule pairs formed rapidly from the corresponding pyridinium cations.

Synthesis and X-ray characterization of the novel pentagonal bipyramidal chromium complex, diaqua-(2,6-diacetylpyridine bis-semicarbazone)- chromium(III) hydroxide dinitrate monohydrate

The first pentagonal bipyramidal chromium(III) complex has been prepared and characterized, suggesting that seven-co-ordination may not be as rare as previously assumed and may also be the geometry of intermediates in octahedral substitution reactions.