摘要:
A stabilized maleimide compound which is hardly discolored during storage, wherein the content of primary amines is 500 ppm or less, that of maleic anhydride is 5-2,000 ppm, and that of 2-amino-N-substituted succinimide is 300 ppm or less. It is preferable that the content of chlorine compounds be 10 ppm or less in terms of chlorine and that of volatile components having each a boiling point of 200 DEG C or below under an ordinary pressure be 2,000 ppm or less.
摘要:
A method for preparing a new class of protected amino intermediates is provided which utilizes reaction of an imido protected primary amine with a secondary amine. The intermediates thus provided are suitably protected for nucleophilic functionalization on the residue of the primary amine. The desired imido protected amine thus derivatized may be regenerated using acid. Further provided are methods for resolving racemic primary amines. Also provided are β-lactam intermediates protected with the new amino protecting group which are useful in the preparation of β-lactam antibiotics.
摘要:
A method for handling a maleimide, which method comprises handling said maleimide in the presence of a stabilizer at a temperature exceeding the melting point thereof in a state kept in contact with a gas phase having a molecular oxygen content of not more than 10% by volume.
摘要:
A method for the production of a maleimide by dehydration and ring-closure of maleinamic acid obtained by the reaction of maleic anhydride with an amine. The method is characterised by effecting ring-closure imidation of the maleinamic acid by heating the maleinamic acid in a water-insoluble or water-immscible inert organic solvent in the presence of a catalyst. The catalyst is a mixture of the amine salt and the acid, supported on a solid carrier.
摘要:
A process for producing an unsaturated dicarboxylic acid imide compound of formula (I): wherein D represents a divalent organic group having at least one carbon/carbon double bond; R¹ represents an n-valent organic group having at least one carbon atom; and n is an integer of 1 or above, which comprises reacting an unsaturated amide acid compound of formula (II): wherein D, R¹, and n are as defined above, with an orthoester of formula (III): R²-C⁅OR³]₃ (III) wherein R² and R³, which may be the same or different, each represents a monovalent organic group having at least one carbon atom, to form an unsaturated dicarboxylic acid amide acid ester compound of formula (IV): wherein D, R¹, R³, and n are as defined above, and then imidating the compound of formula (IV).
摘要:
A method for inhibiting polymerization of a maleimide, which comprises adding to said maleimide, as a polymerization inhibitor, at least one compound selected from the group consisting of thiodipropionic esters, 4-t-butyl-catechol, 2,6-di-t-butyl-p-cresol,2,5-di-t-butyl-hydroquinone, 2-t-butyl-hydroquinone, 2,4-bis-(n-octylthio)-6-(4-hydroxy-3,5-di-t-butylanilino)-1,3,5-trizaine, 2,2'-thiobis(4-methyl-6-t-butylphenol), 4,4'-thiobis-16-t-butyl-m-cresol), and triethyleneglycol-bis-[3-(3-t-butyl-5-methyl-4-hydroxyphenyl) propionate].
摘要:
Neue Derivate des N-Phenylmaleinsäureimides und des N-Phenylsuccinimides der untenstehenden Formel haben gute pre- und postemergente selektiv-herbizide Eigenschaften und sie beeinflussen das Pflanzenwachstum. Die Verbindungen entsprechen der Formel I worin
I : für eine Einfach- oder Doppelbindung, R 1 für Wasserstoff und Fluor, R 2 für Halogen, Y für C 1 -C 8 -Alkyl, Z für Wasserstoff oder C 1 -C 8 -Alkyl, und A für Wasserstoff oder eine Gruppe stehen, wobei R 3 , R 4 , R 5 , R 6 , R 7 und R 8 übliche organische Reste und X Sauerstoff, Schwefel, SO, S0 2 , NH, Alkylimino oder Alkenylimino bedeuten.
摘要:
Härtbare Zusammensetzungen, welche ein Gemisch oder ein Präpolymer-Reaktionsprodukt aus Diaminophenylindan-bis-maleinimid und Aminen, Alkenylphenolen, Alkenylphenoiethern oder deren Gemischen enthalten, sind für die Herstellung von Prepregs, Verbundwerkstoffen, Klebstoffen, Formkörpern, Ueberzügen und ähnlichem geeignet.
摘要:
To improve the emission efficiency, the driving voltage and the lifetime of an organic light-emitting device using a delayed fluorescent material. A host material for a delayed fluorescent material, containing a compound represented by the following general formula: R 1 to R 5 each are a substituent not containing a cyano group, n1 to n5 each are 0 to 4, Ar is a monocyclic arylene group or a monocyclic heteroarylene group.