公开(公告)号：US4689425A

公开(公告)日：1987-08-25

申请号：US927477

申请日：1986-11-06

申请人： Avinash Kachhy ,  Henry J. Barda

发明人： Avinash Kachhy ,  Henry J. Barda

IPC分类号： C07C51/00 ,  C07C51/363 ,  C07C63/70 ,  C07C67/00 ,  C07C67/307 ,  C07C69/78 ,  C07C69/76

CPC分类号： C07C69/78

摘要： A process for photochlorinating aromatic compounds in the side chain and, in particular, a process for the selective chlorination of a 2-alkyl group of 2-alkyl benzoic acid or ester is disclosed. In this process, hydrogen chloride is added to the benzoic acid or ester prior to adding chlorine in the presence of actinic radiation at a reaction temperature below the decomposition temperature of the resulting chlorinated acid or ester. A typical aromatic compound is methyl 2-methylbenzoate and the reaction is preferably carried out at a temperature ranging from about -20.degree. C. to 20.degree. C.

公开(公告)号：US4650880A

公开(公告)日：1987-03-17

申请号：US811215

申请日：1985-12-20

申请人： Avinash Kachhy

发明人： Avinash Kachhy

IPC分类号： C07C51/573 ,  C07D307/89

CPC分类号： C07C51/573

摘要： A process for purifying crude substituted phthalic anhydrides, e.g. 4-methylphthalic anhydride, derived from the dehydrogenation in the presence of bromine of a Diels-Alder addition product of a conjugated diene, e.g. isoprene, and maleic anhydride. In this process, a mixture of the crude, liquid substituted phthalic anhydride, e.g. 4-methylphthalic anhydride, and an alkali is heated to a temperature effective to reduce the impurities present in the crude substituted phthalic anhydride. Suitable alkalis can include sodium hydroxide and sodium carbonate. Mild alkalis are heated to a higher temperature, e.g. 130.degree. C. for sodium carbonate, whereas stronger alkalis are heated to a lower temperature, e.g. 90.degree. C. for sodium hydroxide.

摘要翻译： 用于纯化粗取代的邻苯二甲酸酐的方法，例如 衍生自在共轭二烯的Diels-Alder加成产物的溴存在下脱氢的4-甲基邻苯二甲酸酐，例如。 异戊二烯和马来酸酐。 在该方法中，将粗液体取代的邻苯二甲酸酐， 4-甲基邻苯二甲酸酐，将碱加热至有效降低粗取代邻苯二甲酸酐中存在的杂质的温度。 合适的碱可以包括氢氧化钠和碳酸钠。 将轻度碱加热至较高温度，例如 对于碳酸钠为130℃，而较强的碱被加热到较低的温度，例如 90℃氢氧化钠。