- Effect of Localized Unsaturation on the Scalar Exchange Coupling in Flexible Biradicals
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Time-resolved electron paramagnetic resonance (TREPR) spectra of flexible biradicals containing one and two double bonds are reported.Simulation of the strongly spin-polarized spectra allows determination of the scalar electronic exchange coupling J and the encounter rate ken between the two radical centers.Comparison of each unsaturated biradical with the saturated analogue of similar chain length shows that the J coupling increases with the double bonds present.This and other effects, such as that of the solvent on saturated biradical EPR spectra, are modeled and discussed in terms of both through-bond (TB) and through-solvent (TS) coupling mechanisms.Monte Carlo simulations of the chain dynamics and semiempirical molecular orbital calculations of overlap integrals support the hypothesis that isolated trans double bonds decrease the TS component of the J coupling while increasing the TB component.
- Forbes, Malcolm D. E.
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- COVALENTLY-BOUND POLYBROMOCYCLODODECANE FLAME RETARDANTS
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A polybrominated flame-retardant compound, a process for forming a flame-retardant material, and an article of manufacture are disclosed. The polybrominated flame-retardant compound includes a cyclododecane moiety, at least two bromo groups, and at least one substituent having a reactive functional group. The process includes forming a polybromocyclododecane (PBCD) compound having at least one reactive functional group and incorporating the PBCD compound into a polymer in a process that includes covalent binding of the PBCD compound. The article of manufacture includes a flame-retardant material that comprises a polymer with a covalently-bound PBCD compound.
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Paragraph 0010; 0041-0042
(2020/05/02)
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- Process for purifying dinitrogen monoxide
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The present invention relates to a process for purifying a gas mixture comprising dinitrogen monoxide, at least comprising the at least partial condensation of a gas mixture G-I comprising dinitrogen monoxide to obtain a liquid composition C-1 comprising dinitrogen monoxide, and the contacting of the composition C-1 with a gas mixture M-1 to obtain a composition C-2 and a gas mixture M-2.
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Page/Page column 26; 27
(2013/04/10)
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- PROCESS FOR PREPARING PURE CYCLODODECANONE
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The present invention relates to a process for preparing at least one cyclic compound with Z cycles and 7 to 16 carbon atoms with a keto group, at least comprising the stages: (a1) oxidation of a composition (A), at least comprising one cyclic olefin with Z cycles and 7 to 16 carbon atoms and at least two C—C double bonds, by means of dinitrogen monoxide to give a composition (A1),(a2) separating off the at least one cyclic olefin with Z cycles and 7 to 16 carbon atoms with at least two C—C double bonds from the composition (A1) in order to obtain a composition (A2), and(b) distillative treatment of the composition (A2) from step (a2) in order to obtain a composition (B), comprising the at least one cyclic compound with Z cycles and 7 to 16 carbon atoms with a keto group andless than 1.0% by weight of the at least one compound with Z?1 cycles and 7 to 16 carbon atoms with at least one aldehyde group, where Z can be 1, 2, 3 or 4.
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Page/Page column 17
(2010/08/07)
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- METHOD FOR THE PRODUCTION OF CYCLIC KETONES
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The present invention relates to a process for preparing a cyclic ketone having from 7 to 16 carbon atoms, which comprises at least the steps (a) oxidation of a composition (I) comprising at least one cyclic olefin which has from 7 to 16 carbon atoms and at least one C—C double bond by means of dinitrogen monoxide to give a composition (A),(b) treatment of the composition (A) with at least one base to give a composition (B).
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Page/Page column 9
(2009/12/04)
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- METHOD FOR PURIFYING AND CONCENTRATING DINITROGEN MONOXIDE
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The invention relates to a method for purifying a gas mixture containing dinitrogen monoxide and to the use of a purified gas mixture of this type as an oxidant for olefins. In an additional embodiment, the invention also relates to a method for producing ketones, said method comprising the oxidation of an olefin with a gas mixture containing dinitrogen monoxide that has been purified according to the invention.
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Page/Page column 67-68
(2008/06/13)
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- Process for continuously producing a cyclododecanone compound
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A cyclododecanone compound is continuously produced by feeding a liquid feed containing a corresponding epoxycyclododecane compound and LiBr and/or LiI into a frontmost reaction region of a plurality of reaction regions connected to each other in series; successively passing the liquid feed through the series of reaction regions to catalytically isomerize the epoxycyclododecane compound into a corresponding cyclododecanone compound; and collecting the resultant reaction mixture containing the target cyclododecanone compound from a rearmost reaction region of the series of reaction regions.
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