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Thermal Decomposition of Diphenyl Tetroxane in Chlorobenzene Solution

International Journal of Organic Chemistry 2019年第1期9卷 1-9页

作者： Alexander G. Bordon Andrea N. pila.Mariela I. Profeta María J. Jorge lilian C. Jorge Jorge M. Romero Nelly l. Jorge laboratorio de Investigación en Tecnología Ambiental Facultad de Ciencias Exactas Naturales y Agrimensura de la Universidad Nacional del Nordeste Corrientes Argentina

The thermal decomposition of Cyclic Diperoxide of Benzaldehyde 3,6-diphenyl-1,2,4,5-tetroxane, (DFT) in chlorobenzene solution in the studied temperature range (130°C - 166°C) satisfactorily satisfies a first order law up to 60% conversions of diperoxide. DFT would decompose through a mechanism in stages and initiated by the homolytic breakdown of one of the peroxidic bonds of the molecule, with the formation of the corresponding intermediate biradical. The concentration studied was very low, so that the effects of secondary reactions of decomposition induced by free radicals originated in the reaction medium can be considered minimal or negligible. The activation parameters for the unimolecular thermal decomposition reaction of the DFT are ΔH# = 30.52 ± 0.3 kcal·mol-1 and ΔS# = -6.38 ± 0.6 cal·mol-1 K-1. The support for a step-by-step mechanism instead of a process concerted is made by comparison with the theoretically calculated activation energy for the thermal decomposition of 1,2,4,5-tetroxane.

关键词： DFT Thermal Decomposition Chlorobenzene Mechanism

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Baird’s tapir density in high elevation forests of the Talamanca region of Costa Rica

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Integrative Zoology 2012年第4期7卷 381-388页

作者： JoséF.GONZÁlEZ-MAYA Jan SCHIPPER Beth POlIDORO Annelie HOEPKER Diego ZÁRRATE-CHARRY Jerrold l.BElANT Sierra to Sea Institute ProCAT Internacional/ColombiaLas AlturasCoto BrusPuntarenasCosta Rica Instituto de Ecología Universidad Nacional Autónoma de México(IE-UNAM)Ciudad UniversitariaDFMexico Carnivore Ecology laboratory Forest and Wildlife Research CenterMississippi State UniversityMississippiUSA Big Island Invasive Species Committee University of HawaiiHiloHawaiiUSA Old Dominion University NorfolkVirginiaUSA

Baird’s tapir(Tapirus bairdii)is currently endangered throughout its neotropical range with an expected popula--lished in Valle del Silencio within Parque Internacional la Amistad(pila..Seventy-seven tapir pictures of 15 individuals comprising 25 capture-recapture events were analyzed using mark-recapture *** 100%minimum convex polygon of the sampled area was 5.7 km2 and the effective sampled area using half mean max-imum distances moved by tapirs was 7.16 *** estimated a tapir density of 2.93 individuals/km2 which rep-resents the highest density reported for this *** valleys can represent unique and important habitats for large mammal ***,the extent of isolation of this population,potentially constrained by steep slopes of the cordillera,remains *** genetic and movement studies are required to un-derstand meta-population dynamics and connectivity between lowland and highland areas for Baird’s tapir con-servation in Costa Rica.

关键词： camera trap capture Central America populations tapir

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