- Selective ring-opening of ω-epoxyalkyl (meth)acrylates. An efficient access to bifunctional monomers
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It is shown that ω-epoxyalkyl (meth)acrylates constitute good precursors of bifunctional monemers by selective opening of the oxirane ring.
- Olszewski-Ortar, Agnes,Gros, Phillippe,Fort, Yves
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Read Online
- Preparation, characterization and application of MgFe2O4/Cu nanocomposite as a new magnetic catalyst for one-pot regioselective synthesis of β-thiol-1,4-disubstituted-1,2,3-triazoles
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Magnesium ferrite magnetic nanoparticles were synthesized by a solid-state reaction of magnesium nitrate, hydrated iron(iii) nitrate, NaOH and NaCl salts and then calcined at high temperatures. In order to prevent oxidation and aggregation of magnesium ferrite particles, and also for preparing a new catalyst of supported copper on the magnetic surface, the MgFe2O4was covered by copper nanoparticles in alkaline medium. Magnetic nanoparticles of MgFe2O4/Cu were successfully obtained. The structure of the synthesized magnetic nanoparticles was identified using XRD, TEM, EDS, FT-IR, FESEM and VSM techniques. The prepared catalyst was used in the three component one-pot regioselective synthesis of 1,2,3-triazoles in water. The various thiiranes bearing alkyl, allyl and aryl groups with terminal alkynes, and sodium azide in the presence of the MgFe2O4/Cu nanocatalyst were converted to the corresponding β-thiolo/benzyl-1,2,3-triazoles as new triazole derivatives. The effects of different factors such as time, temperature, solvent, and catalyst amount were investigated, and performing the reaction using 0.02 g of catalyst in water at 60 °C was chosen as the optimum conditions. The recovered catalyst was used several times without any significant change in catalytic activity or magnetic property.
- Eisavi, Ronak,Naseri, Kazhal
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p. 13061 - 13076
(2021/04/22)
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- (Meth) acrylic acid ester compound, the polymerizable composition containing the same, and (meth) acrylic polymer (by machine translation)
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(Meth) acrylic acid ester polymer having a high refractive index giving [to] a compound, a polymerizable composition comprising the same, and (meth) acrylic polymer. (1) (Meth) acrylic acid ester compound represented by the following formula [a] is. [14 A](In the formula, R1 Represents a hydrogen atom or a methyl group, R2 1 - 6 Carbon atoms is a hydrogen atom or an alkyl group. )[Drawing] no (by machine translation)
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Paragraph 0050-0051
(2020/01/03)
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- Green synthesis of thiiranes from epoxides catalyzed by magnetically separable CuFe2O4/Mg(OH)2 nanocomposite in water under benign conditions
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The magnetically separable CuFe2O4/Mg(OH)2 nanocomposite was prepared and characterized by FT-IR, XRD, SEM, EDS, and VSM techniques. The synthesized nanoparticles were used as a new and efficient heterogeneous catalyst for the conversion of various epoxides to the corresponding thiiranes with thiourea in water solvent at room temperature. The reactions were completed within 1–3.7 h to give thiiranes in 70–99% yields. The applied CuFe2O4/Mg(OH)2 nanocomposite was separated easily using an external magnet and reused for several times without any considerable loss of activity.
- Hassanzadeh, Shadi,Eisavi, Ronak,Abbasian, Mojtaba
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p. 240 - 255
(2019/01/30)
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- A green method for solvent-free conversion of epoxides to thiiranes using NH4SCN in the presence of NiFe2O4 and MgFe2O4 magnetic nanocatalysts
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Nickel and magnesium ferrite magnetic nanoparticles were fabricated and applied as efficient and reusable catalysts in the solvent-free conversion of various epoxides to the corresponding thiiranes with ammonium thiocyanate under oil bath (60°C) conditions. NiFe2O4 and MgFe2O4 nanoparticles can catalyze the reactions at short times in high to excellent yields. The catalysts can also be recovered easily using an external magnetic field and be reused four times without any significant loss of activity.
- Eisavi, Ronak,Ahmadi, Fatemeh,Ebadzade, Behrooz,Ghadernejad, Seiran
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p. 614 - 624
(2017/10/03)
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- A green protocol for rapid and efficient conversion of epoxides to thiiranes using alumina immobilized thiourea at solvent-free conditions
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Solvent-free conversion of various epoxides to the corresponding thiiranes was carried out successfully with alumina-immobilized thiourea at room temperature. The reactions were completed within 2-9 min to give thiiranes with 83-98% yields. The utilized alumina can be reused for several times without losing its activity.
- Eisavi, Ronak,Zeynizadeh, Behzad
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- Magnetically separable nano CuFe2O4: an ef?cient and reusable heterogeneous catalyst for the green synthesis of thiiranes from epoxides with thiourea
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The magnetically separable nano CuFe2O4 was prepared and used as an efficient heterogeneous catalyst for conversion of various epoxides to the corresponding thiiranes with thiourea in refluxing ethanol. The reactions were completed within 34?45 min to give thiiranes in 80?95% yields. The utilized nano CuFe2O4 can be reused for several times without losing its activity.
- Eisavi, Ronak,Ghadernejad, Seiran,Zeynizadeh, Behzad,Mohammad Aminzadeh, Farkhondeh
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p. 537 - 545
(2016/10/03)
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- An efficient and improved method for the conversion of oxiranes into thiiranes using graphite oxide
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An efficient and improved procedure has been developed for the conversion of oxiranes into thiiranes using sodium thiocyanate in the presence of graphite oxide under solvent-free conditions at an ambient temperature in excellent yields and in short reaction times.
- Mirza-Aghayan, Maryam,Molaee Tavana, Mahdieh
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- A facile and convenient method for synthesis of thiiranes under mild condition using phase transfer catalyst
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A mild and efficient process for preparation of thiiranes with KSCN in water at room temperature using a catalytic amount of 1,4- bis(triphenylphosphonium)-2-butene dichloride is described.
- Gorjizadeh, Maryam,Afshari, Mozhgan
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p. 1657 - 1660
(2014/05/06)
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- A practical and eco-friendly method for conversion of epoxides to thiiranes with immobilized thiourea on CaCO3
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Solvent-free conversion of various epoxides to the corresponding thiiranes was carried out efficiently with immobilized thiourea on CaCO3. The reactions were completed within 1-12 min under oil bath (60 °C-70 °C) conditions to afford thiiranes in 88%-98% yields. Copyright Taylor & Francis Group, LLC.
- Zeynizadeh, Behzad,Baradarani, Mohammad Mehdi,Eisavi, Ronak
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experimental part
p. 2208 - 2215
(2012/04/04)
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- Zeolite molecular sieve 4: A reusable catalyst for fast and efficient conversion of epoxides to thiiranes with thiourea
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Various epoxides are readily converted to their corresponding thiiranes by thiourea/zeolite molecular sieve 4 system in refluxing MeOH. All reactions were carried out within 12-25 min to give thiiranes in 80%-99% yields. The catalyst saves its catalytic activity for several times at this transformation. Stereospecific conversion of (R)-(+)-styrene oxide to (S)-(+)-styrene episulfide was achieved by this combination system. Taylor & Francis Group, LLC.
- Eisavi, Ronak,Zeynizadeh, Behzad,Baradarani, Mohammad Mehdi
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experimental part
p. 1902 - 1909
(2011/10/09)
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- A green protocol for solvent-free conversion of epoxides to thiiranes with Dowex-50WX8-supported thiourea
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Structurally different epoxides were efficiently converted to the corresponding thiiranes by Dowex-50WX8-supported thiourea under solvent-free conditions. The reactions were carried out either in an oil bath or under microwave irradiation to give the thiiranes in 75-98% yields within 30 sec-120 min.
- Zeynizadeh, Behzad,Yeghaneh, Samal
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experimental part
p. 362 - 368
(2009/09/25)
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- Solvent-free conversion of epoxides to thiiranes by thiourea/NH4Cl system
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Epoxides were readily converted to the corresponding thiiranes by thiourea/NH4Cl system under solvent-free conditions. The reactions were completed within 15-75 min at 60-70°C. The thiiranes were obtained in 65-96% yields. Copyright Taylor & Francis Group, LLC.
- Zeynizadeh, Behzad,Yeghaneh, Samal
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experimental part
p. 2280 - 2286
(2009/08/07)
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- A green protocol for the easy synthesis of thiiranes from epoxides using thiourea/silica gel in the absence of solvent
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The use of thiourea/silica gel provides a green protocol for the easy and high-yielding preparation of thiiranes from different classes of epoxides in the absence of solvent at room temperature. The high stereospecific conversion of (R)(+)-styrene oxide to (S)(+)-styrene sulfide is also reported using this reagent system. Copyright Taylor & Francis Inc.
- Iranpoor, Nasser,Firouzabadi, Habib,Jafari, Abbas Ali
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p. 1809 - 1814
(2007/10/03)
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- A convenient synthesis of phosphorodithioates and novel conversion of epoxides to thiiranes
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Alumina-supported ammonium acetate under microwave irradiation was found to be an efficient reagent for the preparation of phosphorodithioates from phosphorus pentasulfide under solvent-free condition. A simple, efficient, and new method has been developed for the synthesis of thiiranes from epoxides through a one-pot reaction of epoxides with the mixture of phosphorus pentasulfide in the presence of ammonium acetate and acidic alumina under reflux in EtOH or solvent-free conditions under microwave irradiation. These methods are easy, rapid, and good-yielding reactions for the synthesis of phosphorodithioates and thiiranes.
- Kaboudin, Babak,Norouzi, Hamid
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p. 2035 - 2039
(2007/10/03)
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- A new, efficient, and simple method for the synthesis of thiiranes from epoxides under solvent-free conditions
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A simple, efficient, and new method has been developed for the synthesis of thiiranes from epoxides through a one-pot reaction of epoxides with diethyl phosphite in the presence of ammonium acetate or ammonium hydrogen carbonate/sulfur/ and acidic alumina under solvent-free conditions using microwave irradiation.
- Kaboudin, Babak,Norouzi, Hamid
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p. 1283 - 1285
(2007/10/03)
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- Synthesis of thiiranes from oxiranes in water using polymeric cosolvents
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Poly(vinylamine) (PVA) and poly(allylamine) (PAA) were prepared and used as polymeric cosolvents. Oxiranes were converted efficiently to the corresponding thiiranes under mild reaction conditions in water with ammonium thiocyanate (NH4SCN) using these polymeric cosolvents. The polymeric cosolvents are reusable.
- Tamami, Bahman,Kolahdoozan, Majid
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p. 1535 - 1537
(2007/10/03)
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- A Convenient Synthesis of Thiirans by the Use of Dimethylthioformamide
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Dimethylthioformamide (DMTF) reacts with oxirans in the presence of a catalytic amount of trifluoroacetic acid under mild condition to form the corresponding thiirans in good yield.
- Takido, Toshio,Kobayashi, Yoshio,Itabashi, Kunio
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p. 779 - 780
(2007/10/02)
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