-
公开(公告)号：US5175318A
公开(公告)日：1992-12-29
申请号：US866108
申请日：1992-04-07
申请人： Francesco Minisci , Attilio Citterio , Elena Vismara , Silvia De Bernardinis , Carlo Neri , Luciano Pallini , Mariano Correale
发明人： Francesco Minisci , Attilio Citterio , Elena Vismara , Silvia De Bernardinis , Carlo Neri , Luciano Pallini , Mariano Correale
摘要： Phenols are oxidated to quinones with hydrogen peroxide in the presence of catalytic amounts of bromine, iodine, hydrogen bromide and hydrogen iodide.
摘要翻译： 在催化量的溴，碘，溴化氢和碘化氢的存在下，苯酚用过氧化氢氧化成醌。
-
2.发明授权
公开(公告)号：US4542229A
公开(公告)日：1985-09-17
申请号：US483612
申请日：1983-04-11
IPC分类号： C07D307/79 , B01J27/00 , B01J31/00 , B01J31/02 , B01J31/18 , C07B61/00 , C07C41/16 , C07C43/23 , C07D307/86
CPC分类号： C07C41/16 , C07D307/86
摘要： A process is described for preparing 2,3-dihydro-2,2-dimethylbenzofuran-7-ol (I), which is a useful intermediary in the preparation of Carbofuran, a known multi-functional insecticide.The process consists essentially of reacting the pyrocatechol and a methallylhalide in an inert organic solvent in the presence of a solid inorganic base and a suitable catalyst, to obtain o.methallyloxyphenol with high conversion and high selectivity; this product is thermally transposed to o.methallylpyrocatechol, which is finally cyclized to the product (I) by heterogeneous catalysis in the presence of solid acid catalysts.All stages of the process can be carried out in a single reaction medium, without separating intermediate products.
摘要翻译： 描述了制备2,3-二氢-2,2-二甲基苯并呋喃-7-醇（I）的方法，其是制备已知多功能杀虫剂的呋喃丹的有用中间体。 该方法主要包括在固体无机碱和合适的催化剂存在下，使邻苯二酚与甲代烯丙基胺在惰性有机溶剂中反应，得到高转化率和高选择性的甲基丙烯酰氧基苯酚; 该产物热转移到甲基丙烯酰基邻苯二酚，其在固体酸催化剂存在下最终通过非均相催化环化成产物（I）。 该方法的所有阶段都可以在单个反应介质中进行，而不分离中间产物。
-
公开(公告)号：US4933504A
公开(公告)日：1990-06-12
申请号：US275968
申请日：1988-11-25
IPC分类号： C07B61/00 , B01J27/06 , B01J31/02 , C07C41/00 , C07C41/09 , C07C43/23 , C07C43/253 , C07C67/00
CPC分类号： C07C41/09
摘要： Mono-ethers of hydroquinones of formula (I) ##STR1## wherein R represents alkyl, alkoxy-alkyl, cycloalkyl, aryl-alkyl, or cycloalkyl-alkyl, andR.sup.1 is hydrogen or alkyl, cycloalkyl, aryl-alkyl, or cycloalkyl-alkyl, are prepared by contacting the corresponding hydroquinones with the corresponding alcohols ROH, in the presence of a catalytic mixture consisting of(a) a strong acid(b) a halogen or a hydrohalic acid selected from HBr, HI, I.sub.2, and Br.sub.2, and(c) H.sub.2 O.sub.2 in a molar amount lower than that of the starting hydroquinone.
-
4.发明授权
公开(公告)号：US4816592A
公开(公告)日：1989-03-28
申请号：US575544
申请日：1984-01-31
CPC分类号： C07D307/86
摘要： A process for the production of benzofuran derivatives having the general formula, ##STR1## wherein R is alkyl, in particular of 2,3-dihydro-2,2-dimethyl benzofuran-7-ol, starting from pyrocatechol ethers in one step operation.The process essentially consists of heating a solution of pyrocatechol ether in an inert organic solvent in the presence of a catalyst comprising metals of 3.degree. and 4.degree. group of the Periodic System in form of carboxylates or of modified zeolites.The products are known intermediates for the production of insecticides.
摘要翻译： 其中R为烷基，特别是2,3-二氢-2,2-二甲基苯并呋喃-7-醇的苯并呋喃衍生物的制备方法，其一步操作由邻苯二酚醚开始制备。 该方法主要包括在含有羧酸盐或改性沸石形式的定期系统3和4的金属的催化剂存在下，将惰性有机溶剂中的邻苯二酚醚溶液加热。 该产品是用于生产杀虫剂的已知中间体。
-
公开(公告)号：US4599461A
公开(公告)日：1986-07-08
申请号：US690120
申请日：1985-01-10
CPC分类号： C07C41/16
摘要： A process for preparing o-isopropoxyphenol (I) by means of the reaction: ##STR1## in which X is a halogen atom and in which the pyrocatechol (II) is reacted with the isopropyl halide (III) in the presence of an alkaline base in the solid state and of a solid-liquid phase transfer catalyst, in a reaction medium constituted by one or more organic solvents.The catalyst is constituted by a quaternary ammonium or phosphonium salt.The reaction is conducted in a nitrogen atmosphere, at atmospheric pressure, under agitation, at a temperature of preferably between 50.degree. C. and 130.degree. C.
摘要翻译： 通过以下反应制备邻异丙氧基苯酚（I）的方法：其中X是卤素原子，其中邻苯二酚（II）与异丙基卤化物（III）在碱性碱存在下反应 在固体状态和固相 - 液相转移催化剂的反应介质中，由一种或多种有机溶剂构成。 催化剂由季铵盐或鏻盐构成。 反应在氮气气氛中，在大气压下，在搅拌下，优选在50℃至130℃的温度下进行。
-
-
-
-
搜索结果
5 条记录 (耗时 0.024 秒)