3006-86-8Relevant articles and documents
Neutral Organic Super Electron Donors Made Catalytic
Rohrbach, Simon,Shah, Rushabh S.,Tuttle, Tell,Murphy, John A.
supporting information, p. 11454 - 11458 (2019/07/18)
Neutral organic super electron donors (SEDs) display impressive reducing power but, until now, it has not been possible to use them catalytically in radical chain reactions. This is because, following electron transfer, these donors form persistent radical cations that trap substrate-derived radicals. This paper unlocks a conceptually new approach to super electron donors that overcomes this issue, leading to the first catalytic neutral organic super electron donor.
Lithographic printing method
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, (2008/06/13)
A lithographic printing plate precursor comprising a support and an image-recording layer containing at least one infrared absorbing agent of a cyanine dye in which a HOMO energy level of each of substituents present on both terminal nitrogen atoms is -10.0 eV or higher. An infrared absorbing agent of a cyanide dye represented by formula (V) shown below: wherein Z 1 and Z 2 each independently represents an aromatic ring which may have a substituent or a hetero aromatic ring which may have a substituent; R 10 and R 20 each independently represents a phenyl group, a naphtyl group, an anthracenyl group, a carbazolyl group or a phenothiazinyl group each of which may have a substituent; A - represents an anion which exists in case of being necessary for neutralizing a charge and is selected from a halogen ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion and a sulfonate ion; and n represents 1 or 2.
Synthesis of geminal bisperoxides by acid-catalyzed reaction of acetals and enol ethers with tert-butyl hydroperoxide
Terent'ev, Alexander O.,Kutkin, Alexander V.,Troizky, Nikolay A.,Ogibin, Yuri N.,Nikishin, Gennady I.
, p. 2215 - 2219 (2007/10/03)
A new efficient procedure was developed for the synthesis of geminal bisperoxides by reaction of ketals and enol ethers with tert-butyl hydroperoxide catalyzed by protic or Lewis acids. Georg Thieme Verlag Stuttgart.
Substituent Effects on the Decomposition of Bis(tert-butylperoxy)cycloalkanes
Matsuyama, Kazuo,Kumura, Hiromi
, p. 1766 - 1770 (2007/10/02)
Decompositions of bis(tert-butylperoxy)cycloalkanes have been carried out in cumene and n-alkanes at temperatures of 80-120 deg C and have been compared mainly with the decomposition of tert-alkyl tert-butyl peroxides in order to investigate substituent effects on the homolytic scission of one O-O bond in gem-diperoxides.The decomposition rates of bis(tert-butylperoxy)cycloalkanes are much faster than those of tert-alkyl tert-butyl peroxides; the decomposition rates of the cycloalkanes decrease in the following order: cyclopentane > 3,5,5-trimethylcyclohexane > cyclohexane > cyclooctane > cyclododecane.The effect of ring size on the decomposition and the isokinetic relationships between the activation parameters suggest that stabilization of the transition state by electron donation from the cycloalkyl substituents and repulsion between lone-pair electrons on different peroxy oxygen atoms in the ground state are important factors in the decomposition of gem-diperoxides.
Radical Intermediates in the Thermal Decomposition of 1,1-Bis(t-butyldioxy)cyclohexane
Sugihara, Yasushi,Watanabe, Yasumasa,Kumura, Hiromi,Nakamura, Tomoyuki,Suyama, Shuji,Sawaki, Yasuhiko
, p. 664 - 667 (2007/10/02)
The thermolysis mechanism of 1,1-bis(t-butyldioxy)cyclohexane (6) has been studied in solutions.The activation parameters obtained in cumene are ΔH=139.5 kJ mol-1 and ΔS=44.8 J K-1 mol-1, and the volatile products are t-butyl alcohol, t-butyl peroxyhexanoate, and 2,3-dimethyl-2,3-diphenylbutane along with minor products of acetone, cyclohexanone, and t-butyl 1-methyl-1-phenylethyl peroxide.The thermolysis of 6 in benzene gave acetone and t-butyl alcohol as major volatile products.The polyester of 2-hydroxyhexanoic acid was obtained both in cumene and benzene as a non-volatile product, and the yield was as high as 76percent in benzene.These facts indicate that oxyl radical (7) undergoes a facile ring-opening reaction yielding 5-(t-butyldioxycarbonyl)pentyl radical (8).The resulting radicals abstract hydrogen atoms either intra- or intermolecularly.The former reaction is predominant in the absence of good hydrogen donors, affording 2-hexanolide and ultimately the corresponding polyesters.
2-Hydrocarbyl ethers of cycloaliphatic ketones and process for their preparation
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, (2008/06/13)
Compounds of the formula EQU1 WHEREIN R is a hydrocarbyl radical selected from the group consisting of alkyl, aralkyl and cycloalkyl having from 3 to 12 carbon atoms and n is an integer from 1 to 9 are prepared by reacting a 1,1-bis (hydrocarbyl peroxy) cycloalkane with cycloaliphatic ketones in the presence of a molybdenum containing catalyst. The 1,1-bis (hydrocarbyl peroxy) cycloalkane can be prepared in situ from an organic hydroperoxide and a cycloalkanone. The compounds have utility as solvents and certain specific members of the class have utility as intermediates to adipic acid by further oxidation or as an intermediate to 2-t-butoxyphenol by known dehydrogenation methods.