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二异丙基萘合成新工艺 总被引:2,自引:0,他引:2
首次用天然硅铝酸合成二异丙基萘,生产过程简单、无腐蚀和废水污染。在150℃下,丙烯与萘的摩尔比为2:1、催化剂用量8%、反应时间6h的条件下,二异丙基萘的单程收率为231%,单异丙基萘的单程收率为583%。 相似文献
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本文报道了以2-萘酚为原料,采用溴保护法,经甲醚化,溴化,乙酰化,脱溴四步,合成2-甲氧基-6-萘乙酮,四步总收率达83.4%(以2-萘粉汁),比文献收率50%提高33.4%,使产品成本大幅度下降。 相似文献
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采用萘与 2 0 %发烟硫酸的磺化反应及 1 ,5-萘二磺酸钠与氢氧化钠水溶液的水解反应可合成1 ,5-二羟基萘。合成总收率达 49.9%。 相似文献
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研究了新型阻燃剂5,6,7,8-四溴-1,2,3,4-四氢化萘(TBT)的合成方法,并对工艺条件进行了研究。总收率可达50.3%。 相似文献
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以精萘为原料,通过磺化、碱熔制得高纯度的1,5-二羟基萘。最佳反应条件为磺化温度25℃,酸析pH=5~6,当精萘用量为10g时,溶剂1,2-二氯乙烷的用量45mL。在最佳反应条件下,碱熔收率达90.2%,产品纯度为99.3%。 相似文献
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萘二酚类中间体的传统合成工艺具有操作简单和工业化程度高等优点,但存在废酸排放量大、后处理工艺复杂、成本高和环境污染严重等问题,近年来有被绿色合成工艺逐步替代的趋势。本文回顾了以磺化碱熔法和硝化还原法为主的传统合成方法;简述了用微藻类微生物、重组酵母以及多种结构的加氧酶代谢转化的生物转化法和以强酸、生物酶以及有机金属络合物作为催化剂的直接催化羟基化法等新兴绿色合成工艺。着重介绍了1,6-二羟基萘(又称为1,6-萘二酚)的合成工艺进展,特别是在过氧化氢存在下,采用酸催化剂,如用强酸氢氟酸和五氟化锑催化以及用氟锑磺酸、三氟化硼和氢氟酸等直接进行的催化羟基化反应。同时还综述了萘二酚化合物在染料、医药、催化及电池等领域的典型应用情况。最后指出了生物转化法及催化羟基化法制备萘二酚的改进方向是提高反应的收率及萘的转化率,以达到大规模工业化生产的水平;并对萘二酚类中间体应用领域的拓展进行了展望,指出其向精细化、高附加值的医药及材料方向发展的趋势。 相似文献
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Two new dichloro-substituted poly(9,10-dihydroanthracene-9,10-diylidene)s were prepared by self-condensation of 1,5-dichloroanthrone and 1,8-dichloroanthrone. The bromination and thermal and semiconductive properties were investigated. 相似文献
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John S. Bergman Henry C. Duffin Clifford H. J. Wells 《Propellants, Explosives, Pyrotechnics》1998,23(4):208-211
The nitration of 1,4-di(2,4,6-trinitrophenyl)naphthalene and 1,5-di(2,4,6-trinitrophenyl)naphthalene and of mono- and dinitro-derivatives of these compounds has been studied with a view to obtaining heat resistant materials of high energy. A number of mono-, di- and tri-nitro derivatives of 1,4-di(2,4,6-trinitrophenyl) and 1,5-di(2,4,6-trinitrophenyl)naphthalenes have been prepared. 相似文献
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John S. Bergman Henry C. Duffin Peter Golding Clifford H. J. Wells 《Propellants, Explosives, Pyrotechnics》1996,21(5):227-230
Mononitro-, dinitro-, trinitro- and tetranitro-derivatives of 1-(2,4,6-trinitrophenyl)naphthalene have been synthesised using a variety of nitration procedures. The mononitro- and dinitro-derivatives have also been synthesised from 1-bromonaphthalene and 1-nitronaphthalene via a combination of bromination, nitration and Ullmann reactions. 相似文献
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Poly(naphthylenethiophene)s and poly(naphthylenevinylene-phenylenevinylene)s prepared from 1,5-dibromo-3,7-di-t-butylnaphthalene showed a significant blue shift in their UV-vis and photoluminescence spectra compared to copolymers derived from the 1,4-naphthylene system, both in solution and in thin film. This is correlated to a change in conjugation effect of the two positional isomers of naphthalene in the polymer backbone, where in 1,4-conjugation an aromatic sextet remains intact in one of the naphthalene rings whereas 1,5-conjugation involves the loss of resonance energy in the entire naphthalene unit. The series of poly(naphthylenevinylene-phenylvinylene)s emitted blue-green light with very high fluorescence quantum yields (80-95%) in solution. A fabricated device showed external quantum efficiency estimated at 0.2-0.4%, with a relatively high turn-on voltage at ∼7.0 V. 相似文献
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New thioetherglycidyl resins produced by condensation of 1-mercaptomethylnaphthalene, 1,4-di(mercaptomethyl)naphthalene, 1,5-di(mercaptomethyl)naphthalene, and their mixture of 1,4- and 1,5-di(mercaptomethyl)naphthalene with epichlorohydrin were obtained. The condensation was carried out in two ways. In the first way, potassium salt of mercaptans and epichlorohydrin were used. In the second, epichlorohydrin was added to mercaptans and then the obtained chlorohydrin thioether was dehydrohalogenated by the alkaline hydroxide in water and n-butanol or isopropyl alcohol solution. The method of heterogeneous condensation of dithiol with epichlorohydrin in water and isopropyl alcohol solution proved to be the most effective. Yield, the epoxide content, and the total chlorine content for all resins were found. The structure of thioetherglycidyl resins with the highest epoxide content was determined by elementary analysis, and infrared (IR) and NMR spectra. Thermal stability of resins was studied during long controlled heating at unchanged temperature and short heating carrying the thermal gravimetric analysis (TGA) mainly in air. As follows from the studies, thioetherglycidyl resins can be cured both chemically and thermally. 相似文献
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Summary Series of new copoly(arylene ether)s containing
naphthalene or naphthalene/1,3,4-oxadiazole units have been
obtained by polycondensation in solution starting from the
following systems of monomers: 1,5 or
2,6-bis(4-fluorobenzenesulfonyl) naphthalene /
2,6-bis(4-fluorobenzoyl)naphthalene, 1,5 or
2,6-bis(4-fluorobenzen sulfonyl)naphthalene /
2,2-(oxydi-4,1-phenylene)bis[5-(4-fluorophenyl)-1,3,4-
oxadiazole] and 2,6 bis-(4
fluorobenzoyl)naphthalene/2,2-(oxydi-4,1-phenylene)bis
[5-(4-fluorophenyl)- 1,3,4-0xadiazole]. Hydroquinone and
4,4dihydroxy benzophenone have been used as aromatic dihydroxy
compounds. The copolymers, obtained in quantitative yields,
possessed inherent viscosities in the range 0.28-0.58 dl
g-1, had good thermal stability (10%
weight loss temperatures were above 460°C both in nitrogen and
air) and high glass transition temperatures (in the range
190-210°C). They have been characterized by infrared analyses,
GPC and wide-angle X-ray diffraction. The copolymer
property-structure relationships were studied and the properties
have been compared with those of the corresponding
homopolymers. 相似文献
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A new naphthalene‐ring‐containing bis(ester–amine), 1,5‐bis(3‐aminobenzoyloxy)naphthalene, was prepared from the condensation of 1,5‐dihydroxynaphthalene with 3‐nitrobenzoyl chloride followed by catalytic hydrogenation. A series of novel naphthalene‐containing poly(ester–amide)s was synthesized by direct phosphorylation polyamidation from this bis(ester–amine) with various aromatic dicarboxylic acids. The polymers were produced in high yields and had moderate inherent viscosities of 0.47–0.81 dL g?1. The poly(ester–amide) derived from terephthalic acid was semicrystalline and showed less solubility. Other polymers derived from less rigid and symmetrical diacids were amorphous and readily soluble in most polar organic solvents and could be solution‐cast into transparent, flexible and tough films with good mechanical properties. The amorphous poly(ester–amide)s displayed well‐defined glass transition temperatures of between 179 and 225 °C from differential scanning calorimetry and softening temperatures of between 178 and 211 °C from thermomechanical analysis. These poly(ester–amide)s did not show significant decomposition below 400 °C in nitrogen or air. Copyright © 2004 Society of Chemical Industry 相似文献