- Preparation of hexenedioic acid diesters
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Hexene-1,6-dioates, readily hydrogenated into adipates (which in turn are conveniently hydrolyzed into adipic acid), are prepared by reacting carbon monoxide, an alcohol and at least one dichlorobutene, in the presence of a catalytically effective amount of palladium or a palladium compound and no more than two equivalents (relative to the dichlorobutene) of a tertiary amine reaction promoter; in an alternate embodiment, the tertiary amine and the dichlorobutene are first converted into a quaternary ammonium chloride intermediate.
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- Rate Constant for the Reaction of O(3P) with Pyridine from 323 to 473 K
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Reactive mixtures O(3P) plus pyridine were produced and studied in our fast-flow discharge apparatus.Several chemiluminescent radiations were identified as the electronic transitions CH(A2Δ-X2Π), OH(AΣ+-X2Π), and CN(B2Σ+-X2Σ+) and their band intensities recorded as a function of the pyridine concentration.By using pseudo-first-order conditions we measured the rate constant for the initial reaction via the chemiluminescent detection of oxygen atoms with NO.Over the temperature range of 323-473 K the measured rate constants are well represented by the Arrhenius expression: k/(cm3 mol-1 s-1) = 12> exp.A comparison with the analogous O + benzene reaction is made including some comments on the electrophilic attack of both aromatic rings by the oxygen atom.
- Tabares, F. L.,Urena, A. Gonzalez
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p. 4933 - 4936
(2007/10/02)
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