共查询到20条相似文献,搜索用时 160 毫秒
1.
以邻苯二酚和乙醇为原料,通过取代、硝化反应先制得2-乙氧基-4-硝基苯酚;然后在钯碳催化剂作用下进行加氢反应制得2-乙氧基-4-氨基苯酚粗品;粗产物用苯-石油醚进行重结晶得到纯品。产品总收率为60.5%。 相似文献
2.
本文以4-氯-2-氨基苯酚为起始原料合成了4-氯-5-硝基-2-氨基苯酚。4-氯-2-氨基苯酚经醋酐酰化制得2-乙酰氨基-4-氯苯酚,粗产率为92.4%,熔点为170.3℃~171 3℃。然后分别以氯苯,邻二氯苯为脱水剂在回流条件下反应15小时,经真空蒸馏得到5-氯-2-甲基苯并(?) 唑,熔点为52℃-54℃。将5-氯-2-甲基苯并(?)唑进行硝化反应,得到5-氯-6-硝基-2-甲基苯并(?)唑,粗产率84.76%,熔点为135.5℃-139.0℃。5-氯-6-硝基-2-甲基苯并(?)唑在强碱条件下水解后,经酸析得到4-氯-5-硝基-2-氨基苯酚,粗产率为90.10%.熔点为209.8~210.0℃。 相似文献
3.
4.
5.
6.
7.
8.
9.
以分散蓝2BLN(C.I.D isperse B lue 56)水解工序的废液为原料,经回收得到2,4-二硝基苯酚粗品,然后用NaHS作还原剂,于72~74℃,pH=7~8下将其部分还原、精制,制得高纯度的2-氨基-4-硝基苯酚,总收率达到68%(以废液中2,4-二硝基苯酚计),w(2-氨基-4-硝基苯酚)>98%(液相色谱外标定量)。制得的2-氨基-4-硝基苯酚经重氮化、与2,4-二氨基苯磺酸偶合,合成出高强度的皮革棕RHM(C.I.Mordant brown 33 C.I.13250)。 相似文献
10.
11.
以负载型KT-02催化剂催化5.硝基邻甲酚加氢制备5.氨基邻甲酚。对反应条件进行了一系列优化,研究了温度、压力、催化剂加入量等因素对反应的影响,在90~100℃、2.0MPa下,产品收率大于98%,纯度达99.5%。 相似文献
12.
Pt/C催化剂的改性制备及其在对氨基苯酚合成中的应用研究 总被引:3,自引:0,他引:3
本文报道了Pt/C催化剂的改性制备,并研究了其以对氨基苯酚合成中的应用,发现该催化剂比末改性的催化剂具有收率高,副产物少和使用寿命长等特点。 相似文献
13.
2-乙基-4-乙氧基-6-羟基嘧啶的合成工艺研究 总被引:2,自引:1,他引:2
以丙腈为初始原料 ,依次合成丙脒盐酸盐 ,2 -乙基 - 4,6 -二羟基嘧啶 ,最后合成目标产物 2 -乙基 - 4-乙氧基 - 6 -羟基嘧啶 ,考察了催化剂用量、物料配比、碱浓度、反应时间、反应温度对 2 -乙基 -4-乙氧基 - 6 -羟基嘧啶收率的影响 ,在优化工艺条件下 :以四乙基碘化铵为催化剂 ,用量为 6‰ (相对于 2 -乙基 - 4,6 -二羟基嘧啶的摩尔分数 ) ,物料配比 1∶ 1 .1 5 ,氢氧化钠质量百分比浓度为 1 0 % ,反应时间 6 h,反应温度 6 0°C,反应总收率高达 80 .2 %。同时对反应产物及其各个中间体进行了定性定量分析 相似文献
14.
15.
A. P. Khrimian A. B. DeMilo R. M. Waters R. T. Cunningham B. A. Leonhardt 《Journal of chemical ecology》1993,19(12):2935-2946
A general synthetic approach to various catechol derivatives was developed using a copper-catalyzed cross-coupling reaction of 1,2-dimethoxy-4-brornomethyl, 1-ethoxy-2-methoxy-4-bromomethyl- and 2-ethoxy-1-methoxy-4-bromomethylbenzenes with Grignard reagents. Dilithium tetrachlorocuprate was an acceptable catalyst in the dimethoxy series, whereas copper(I) iodide in THF-HMPA was a superior catalyst in all cases due to decreased side reactions, i.e., reduction and reductive coupling. Methyl-substituted analogs of methyl eugenol, a potent attractant of Oriental fruit fly,Dacus dorsalis Hendel, were synthesized by this method and evaluated for attractancy in field tests.On leave from the Institute of Organic Chemistry of the Armenian Academy of Sciences, Yerevan, Armenia; author to whom correspondence should be addressed.Presented at the 204th ACS National Meeting, Washington, D.C., 1992. This paper reports the results of research only. Mention of a proprietory product does not constitute an endorsement of this product by the USDA. 相似文献
16.
戊二醛是一种有着广阔发展前景的精细化工产品,它的两个自由醛基非常活泼,能进行多种反应.被广泛应用在医药、油田、制革、食品、环境保护等领域。为了利用本公司具有丙烯醛原料的优势,积极开发高附加值的下游产品,进行了乙烯基乙醚和丙烯醛反应合成2-乙氧基-3,4-二氢吡喃及其水解制备戊二醛的研究.并在连续化吡喃合成和水解方面取得了一定的技术突破,形成了特有的戊二醛合成工艺。 相似文献
17.
18.
以4-羟基-3-硝基苯甲酸甲酯(1)和2-溴乙酸乙酯(2)为原料,合成了未见文献报道的4-(2-乙氧基-2-氧-乙氧基)-3-硝基苯甲酸甲酯(3),考察了反应条件对收率的影响,确定了优惠合成工艺条件:反应温度50℃,反应时间4h,物料比n(1)∶n(2)∶n(K2CO3)=1∶1.2∶1.5,相对于原料1,溶剂二甲基甲酰胺用量为1000mL/mol。产品的收率96.9%,含量98.9%,产品结构经元素分析、红外光谱、核磁共振确证。 相似文献
19.
20.
Ludk Taimr 《大分子材料与工程》1994,217(1):119-128
A study has been carried out of the reaction of 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline (ethoxyquin, I ) with alkylperoxyls. In the presence of a relatively low concentration of 1-cyano-1-methylethylperoxyl, I reacts to form dimer IV (8-(6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-1-yl)-6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline) as the main product and quinoline derivative III (2,4-dimethyl-6-ethoxyquinoline), as a side product, i.e., substances formed by the conversion of the aminyl II (6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-1-yl) alone. Smaller amounts of p-quinoneimine VI and o-quinoneimine VIII (2,2,4-trimethyl-2,6-dihydro-6-quinolone and 6-ethoxy-2,2,4-trimethyl-2,8-dihydro-8-quinolone) have been found; these substances are formed by further oxidation of II . In the presence of relatively high concentrations of tert-butylperoxyls, peroxide IX (6-tert-butylperoxy-6-ethoxy-2,2,4-trimethyl-2,6-dihydroquinoline) is formed as the main product. Substance IX thermally decomposes to form VIII , while in the presence of weak acids IX is converted into VI as the main product. Dimer IV is a medium-strength antioxidant which is gradually converted into 8-(6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-1-yl)-2,2,4-trimethyl-6-quinolone (XI) and 8-(6-ethoxy-3-hydroxy-2,2-dimethyl-4-methylene-1,2,3,4-tetrahydroquinolin-1-yl-)-2,2,4-trimethyl-2,6-dihydro-6-quinolone) (XII) . The methyl group in XI actively participates in the antioxidation process. When formed, nitroxide V (6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinolin-N-oxyl) acts as an efficient antioxidant which, however, does not participate in the cyclic mechanism that is employed to explain the action of antioxidants of the HALS type. The antioxidant properties were evaluated on the basis of their effect on the course of the autoxidation of squalene. 相似文献