共查询到20条相似文献,搜索用时 62 毫秒
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Ali Delibaş 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(9):969-975
The new acrylamide monomer, N‐(4‐Bromophenyl)‐2‐methacrylamide (BrPMAAm) has been synthesized by reacting 4‐Bromoaniline with methacryloyl chloride in the presence of triethylamine(NR3) at 0–5°C. The radical‐initiated copolymerization of (BrPMAAm), with 2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid (AMPS) has been carried out in dimethylformamide (DMF) solution at 70±1°C using 2,2′‐azobisisobutyronitrile (AIBN) as an initiator with different monomer‐to‐monomer ratios in the feed. The copolymers were characterized by FTIR, 1H‐ and 13C‐NMR spectroscopy. The copolymer composition was evaluated by nitrogen content (N for AMPS‐units) in polymers led to the determination of reactivity ratios. The monomer reactivity ratios for BrPMAAm (M1)‐AMPS (M2) pair were computed using the Fineman‐Ross (F‐R), Kelen‐Tüdös (KT) and Extended Kelen‐Tüdös (EKT) methods. These parameters were also estimated using a non‐linear computational fitting procedure, known as reactivity ratios error in variable model (RREVM). The mean sequence lengths determination indicated that the copolymer was statistically in nature. By TGA and DSC analyses, the thermal properties of the polymers have been studied. The antimicrobial effects of polymers were also tested on various bacteria, and yeast. 相似文献
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(2S)‐6‐Fluoro‐4‐oxo‐3,4‐dihydro‐2H‐chromene‐2‐carboxylic acid, a key intermediate of Fidarestat, was synthesized from natural chiral pool D‐mannitol. Its structure was confirmed by optical analyses, elemental analyses, and IR, 1H NMR, and ESI‐MS spectra. 相似文献
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Tarek M. Abou Elmaaty 《合成通讯》2013,43(16):2281-2285
Starting from indan‐1,3‐dione, a novel two‐step synthesis of the oxepine derivatives 5a,b and the pyran derivatives 7 and 8 under very simple reaction conditions is described. 相似文献
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John L. Tucker Michel Couturier Michael J. Castaldi Charles K. F. Chiu Detlef Gestmann 《合成通讯》2013,43(15):2145-2150
The preparation of the title compound has been revisited and improved. Starting from inexpensive cuminonitrile, 4‐(2‐hydroxy‐2‐methyl)‐ethyl‐benzylamine is obtained in a scalable two‐step process with an overall yield of 55%. 相似文献
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A general method for the preparation of 2‐(N‐Substituted)‐2‐imidazolines and 2‐(N‐Substituted)‐1,4,5,6‐tetrahydropyrimidines is described. These heterocycles can be synthesized from their respective anilines with 2‐chloro‐2‐imidazoline or 2‐chloro‐1,4,5,6‐tetrahydropyrimidine, generated in situ from imidazolidin‐2‐one and tetrahydropyrimidin‐2(1H)‐one activated by dimethyl chlorophosphate, in good to excellent yields. 相似文献
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《Journal of carbohydrate chemistry》2013,32(5):325-335
Abstract 1‐(Methyl 3‐O‐benzyl‐4,6‐O‐benzylidene‐2‐deoxy‐α‐D‐altropyranosid‐2‐yl)‐4‐phenyl‐but‐3‐yn‐2‐one (4) was synthesized by the reaction of (methyl 3‐O‐benzyl‐4,6‐O‐benzylidene‐2‐deoxy‐α‐D‐altropyranosid‐2‐yl)ethanal (2) with lithium phenylethynide and following oxidation. Compound 4 and hydrazine hydrate provided the 3(5)‐(methyl 3‐O‐benzyl‐4,6‐O‐benzylidene‐2‐deoxy‐α‐D‐altropyranosid‐2‐yl‐methyl)‐5(3)‐phenyl‐1H‐pyrazole (5). The reactions of 4 with amidinium salts and a S‐methyl‐isothiouronium salt, respectively, furnished the pyrimidine C‐nucleoside analogues 6a–6c. Treatment of 4 with 2‐aminobenzimidazole afforded 2‐(methyl 3‐O‐benzyl‐4,6‐O‐benzylidene‐2‐deoxy‐α‐D‐altropyranosid‐2‐ylmethyl)‐4‐phenyl‐benzo [4,5]imidazo[1,2‐a]pyrimidine (7a). Compound 4 and sodium azide yielded 2‐(methyl 3‐O‐benzyl‐4,6‐O‐benzylidene‐2‐deoxy‐α‐D‐altropyranosid‐2‐yl)‐1‐[5(4)‐phenyl‐1H(2H)‐1,2,3‐triazole‐4(5)‐yl]ethanone (8). 相似文献
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Fifteen 2‐(5‐substituted‐1,3,4‐thiadiazolo‐2‐ylimino)‐4‐thiazolidinones were efficiently synthesized from the reaction of ammonium thiocyanate with 2‐chloro‐N‐(5‐substutited‐1,3,4‐thiadiazolo‐2‐yl)acetamides under microwave irradiation. The target compounds were obtained in better yields (75–98%) and shorter time (5 min) than with conventional heating. 相似文献
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《合成通讯》2013,43(12):1641-1647
Abstract Interaction of 2‐imino‐2H‐pyrano[2,3‐c]pyridin‐3‐carboxamide with substituted 2‐aminobenzophenones proceeds via recyclization mechanism leading to substituted 3‐(4‐arylquinazolyn‐2‐yl)‐2H‐pyrano[2,3‐c]pyridin‐2‐ones. Their reaction with acetic anhydride affords the O‐acylation products. 相似文献
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V. Petrović Ž. Car B. Prugovečki D. Matković‐Čalogović 《Journal of carbohydrate chemistry》2013,32(8-9):685-695
Abstract 2‐Acetamido‐2‐deoxy‐β‐D‐mannopyranose (1) was glycosylated by the Fischer method using an acidic ion‐exchange resin as the catalyst to give α‐methyl glycoside 2. Selective pivaloylations of methyl 2‐acetamido‐2‐deoxy‐α‐D‐mannopyranoside (2) have been studied under various reaction conditions. Two partially pivaloylated products were submitted to additional acetylations. All structures were established by NMR spectroscopy. Structure of the methyl 2‐acetamido‐2‐deoxy‐3,6‐di‐O‐pivaloyl‐α‐D‐mannopyranoside (4) was determined by X‐ray analysis. 相似文献
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The base‐catalyzed Diels–Alder reactions of 4‐arylthio‐3‐hydroxy‐2‐pyrones are reported. Treatment of 4‐arylthio‐3‐hydroxy‐2‐pyrones and dienophiles with triethylamine gave 2‐arylthio‐2‐cyclohexenone derivatives by the Diels–Alder reaction involving a decarboxylation in excellent to reasonable yields. 相似文献
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Andrzej Temeriusz Magdalena Rowińska Bogusława Piekarska‐Bartoszewicz Romana Anulewicz‐Ostrowska Michał K. Cyrański 《Journal of carbohydrate chemistry》2013,32(7):697-704
The title compound was synthesized starting from methyl 3,4,6‐tri‐O‐acetyl‐2‐acetamido‐2‐deoxy‐β‐D‐glucopyranoside, oxalyl chloride, and methyl 3,4,6‐tri‐O‐acetyl‐2‐amino‐2‐deoxy‐β‐D‐glucopyranoside. The crystal and molecular structure of the obtained imidazolidine‐4,5‐dione have been determined by X‐ray analysis as well as 1H and 13C NMR spectroscopy. 相似文献
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Gregory B. Kharas Maria R. Cisneros Mollie E. Buchmann Ana Maria Gallegos Matthew J. Hurzeler Jason W. Karras 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(6):865-870
Electrophilic trisubstituted ethylene monomers, alkyl ring substituted methyl 2‐cyano‐3‐phenyl‐2‐propenoates, RC6H4CH[dbnd]C(CN)CO2CH3, where R is 2‐methyl, 3‐methyl, 4‐methyl, 4‐isopropyl, and 2,5‐dimethyl were synthesized by piperidine catalyzed Knoevenagel condensation of ring‐substituted benzaldehydes and methyl cyanoacetate, and characterized by CHN elemental analysis, IR, 1H and 13C NMR. Novel copolymers of the ethylenes and styrene were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator (AIBN) at 70°C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1H and 13C NMR, GPC, DSC, and TGA. High Tg of the copolymers in comparison with that of polystyrene indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the copolymers decompose in the 260–400°C range. 相似文献
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《高分子科学杂志,A辑:纯化学与应用化学》2013,50(8):957-962
Equimolar alternating copolymers of vinyl acetate and electrophilic trisubstituted ethylene monomers, ring‐substituted methyl (E)‐2‐cyano‐3‐phenyl‐2‐propenoates, RC6H4CH?C(CN)CO2CH3 (where R=4‐acetamido, 2‐cyano, 3‐cyano, 4‐cyano, 4‐diethylamino) were prepared via copolymerization in solution with radical initiation (ABCN) at 70°C. The compositions of the copolymers were calculated from nitrogen analysis and the structures were analyzed by IR, 1H‐ and 13C‐NMR. High glass transition temperatures of the copolymers in comparison with that of polyvinyl acetate indicate a decrease in chain mobility of the copolymers due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the decomposition of the copolymers occurs in two steps. The first step is relatively fast weight loss in 257–370°C range followed by very slow decomposition of the formed residue in 370–950°C range. 相似文献
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Reaction of 3‐(2‐bromo‐acetyl)‐chromen‐2‐one with thiosemicarbazide and 2‐acetylbutyro lactone in anhydrous ethanol gave 3‐{2‐[5‐hydroxy‐4‐(2‐hydroxy‐ethyl)‐3‐methyl‐pyrazol‐1‐yl]‐thiazol‐4‐yl}‐chromen‐2‐one in good yields. 相似文献
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Gregory B. Kharas Xue Tian Joanna Alegarbes Andrea T. Bartosik Mirela Hadziahmetovic Asra K. Hai 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(6):565-568
Electrophilic trisubstituted ethylene monomers, ring‐substituted 2‐cyano‐N,N‐dimethyl‐3‐phenyl‐2‐propenamides, RC6H4CH?C(CN)CON(CH3)2 (where R is 3‐benzyloxy, 4‐benzyloxy, 3‐ethoxy‐4‐methoxy, 3‐bromo‐4‐methoxy, 5‐bromo‐2‐methoxy, 2‐chloro‐6‐fluoro) were synthesized by potassium hydroxide catalyzed Knoevenagel condensation of ring‐substituted benzaldehydes and N,N‐dimethyl cyanoacetamide, and characterized by CHN elemental analysis, IR, 1H‐ and 13C‐NMR. Novel copolymers of the ethylenes and styrene were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator, ABCN at 70°C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1H and 13C NMR, GPC, DSC, and TGA. High Tg of the copolymers in comparison with that of polystyrene indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the copolymers decompose in the 300–450°C range. 相似文献
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Gregory B. Kharas Xue Tian Traci A. Ackron Michael H. Akroush Kelly A. O'brien Ella Ostrovskaya 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(3):243-247
Electrophilic trisubstituted ethylene monomers, halogen ring‐substituted 2‐cyano‐N,N‐dimethyl‐3‐phenyl‐2‐propenamides, RC6H4CH [dbnd]C(CN)CON(CH3)2 (where R is 2‐Br, 3‐Br, 4‐Br, 2‐Cl, 3‐Cl, 4‐Cl, 2‐F, 3‐F, 4‐F), were synthesized by potassium hydroxide catalyzed Knoevenagel condensation of ring‐substituted benzaldehydes and N,N‐dimethyl cyanoacetamide, and characterized by CHN elemental analysis, IR, 1H‐ and 13C‐NMR. Novel copolymers of the ethylenes and styrene were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator, ABCN at 70°C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1H and 13C NMR, GPC, DSC, and TGA. High T g of the copolymers in comparison with that of polystyrene indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the copolymers decompose in the 300–450°C range. 相似文献
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G. V. Romanenko D. V. Ovcharenko S. F. Vasilevskii 《Journal of Structural Chemistry》2003,44(2):314-317
The crystal and molecular structures of the stable nitroxide radical 2,4,4,5,5pentamethyl2imidazoline1oxyl3oxide was determined. The N—O bond lengths are 1.279(2) and 1.280(2), respectively. The O-—N+=C—N— O fragment is nearly planar with carbon atoms of the ethyl fragment that deviated from the O—N+=C—N—O plane by –0.204(5) and +0.176(5). The minimum intermolecular distance between the oxygen atoms of NO groups is 4.094. 相似文献
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Some substituted 2‐amino‐2‐chromenes were synthesized by the reaction of arylidenemalononitriles with 1‐naphthol or 2‐naphthol in the presence of sodium hydroxide as catalyst under solvent‐free condition. 相似文献