摘要:
The regio-selective functionalization of a dialkyl benzene compound formula (I), wherein the ratio of the compound functionalized at position (a) to the compound functionalized at the position (b) is at least 70:30, more particularly at least 80:20, still more particularly at least 85: 15, and still more particularly at least 90: 10, characterised in that the substituent R is an isobutyl group.
摘要:
A new, highly selective way of removing bromine contamination from a gaseous stream comprised of hydrogen bromide and bromine is described. Such process technology involves non-catalyzed free radical (benzylic) bromination of an alkylene- bridged aromatic hydrocarbon and/or certain alkyl-substituted aromatic hydrocarbons and recovering the purified gaseous HBr. Because of the high selectivity of the bromination on the aliphatic bridges or side-chains, virtually no ring bromination occurs, and this enables recovery of the bromine values in the form of HBr. Thus preferably, the bromine is recovered as HBr from the scrubbing liquid by subjecting the scrubbing liquid to thermal or catalytic dehyrobromination. In plant operations, the gaseous HBr purified in the process can then be introduced into a compressor to produce either liquid or gaseous HBr for storage under pressure. Alternatively, the purified gaseous HBr can be fed directly into one or more reactions in which HBr is used as a reactant.
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Iodierung von aromatischen und/oder heteroaromatischen Verbindungen, dass dadurch gekennzeichnet ist, dass aromatische Verbindungen mit einer Iodquelle in Anwesenheit jeweils mindestens einer Base und eines Gold enthaltenden Katalysators umgesetzt werden. Ferner betrifft die vorliegende Erfindung Gold enthaltende Katalysatoren und deren Herstellweise. Darüber hinaus betrifft die vorliegende Erfindung ein Verfahren zur Herstellung von Anilin.
摘要:
Disclosed is a method for preparing an iodinated aromatic compound. More specifically, disclosed is a method of preparing an iodinated aromatic compound by iodinating an aromatic compound in the presence of oxygen over a zeolite catalyst, in which the aromatic compound and its monoiodo compound, as raw materials, are allowed to react with iodine. In comparison with a method in which only the aromatic compound is used as a raw material without adding the monoiodo compound, the disclosed method can increase the productivity of diiodo compounds and the selectivity to a p-diiodo compound and, at the same time, suppress side reactions, thus lengthening the life span of the catalyst.