摘要:
The present invention relates to a process for the preparation of a compound of formula I (I), comprising reacting a compound of formula II (II), with a brominating agent in the presence of an acidic catalyst to a compound of formula III (III), and reacting the compound of formula III in tetrahydrofuran or 2-methyl-tetrahydrofuran with potassium tert-butoxide to a compound of formula I.
摘要:
A high assay decabromodiphenylalkane product in which the alkylene group contains in the range of about 1-10 carbon atoms and has an occluded free bromine content of
摘要:
Described is process technology for producing brominated aromatic polymer compositions from low molecular weight aromatic polymer compositions. The specified conditions used in the process enable the formation of products having superior color and thermal stability properties.
摘要:
Processes for preparing brominated aromatic flame retardant having a reduced content of occluded free bromine are described. The processes comprise subdividing, during bromination of an aromatic compound, solid particles that form in a bromination reaction mixture in which an excess of liquid bromine and a Lewis acid bromination catalyst are present, said subdividing taking place within the confines of said reaction mixture. Subdivision is effected by grinding, milling, or sonication.
摘要:
High assay, reaction-derived decabromodiphenylethane product is prepared by feeding (i) diphenylethane or (ii) partially brominated diphenylethane having an average bromine number less than about two, or (iii) both of (i) and (ii), into the liquid confines of a reaction mixture. Such reaction mixture is (a) formed from components comprised of excess liquid bromine and aluminum-based Lewis acid bromination catalyst, and (b) maintained at one or more elevated reaction temperatures of from about 45°-90°C, and at least when elevated pressure is needed to keep a liquid state in the reaction mixture at the temperature(s) used, the reaction mixture is at such an elevated pressure, whereby arbromination occurs. The feeding is conducted at a rate slow enough to form high assay reaction-derived decabromodiphenylethane product, which is an effective flame retardant.
摘要:
An organic phosphor of the following formula (1) that can be used in both a light emitting transistor device and an organic EL device. There is provided a light emitting transistor device or an organic EL device, wherein luminescence of such a specified asymmetric pyrene compound is utilized in a light emitting layer of transistor device or a luminescent layer, hole transporting layer or electron transporting layer of organic electroluminescence device. wherein R 1 is an optionally substituted heteroaryl, etc. and R 2 is a hydrogen atom, etc., being different from R 1 .
摘要:
Disclosed is a method for producing a 5-phthalancarbonitrile compound which comprises a step for obtaining a 5-phthalancarbonitrile compound (compound [V]) from a compound [A] via a compound [I], compound [II], compound [III] and compound [IV]. Also disclosed are an intermediate useful for this production method and a method for producing such an intermediate.