- HOLOGRAPHIC RECORDING MATERIALS AND METHODS OF MAKING THE SAME
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Provided herein are compositions suitable for recording holograms containing thiol and/or thioether functionality, and optionally including additional allyl and/or propargyl functional groups. These monomers can be used to synthesize holographic polymers having high Δn values. Also provided herein are methods of making holographic polymers and methods recording holograms using these polymers.
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Page/Page column 32; 35
(2021/12/31)
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- Synthesis and application of Cu(II) immobilized MCM-41 based solid Lewis acid catalyst for aminolysis reaction under solvent-free condition
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In this paper, a Cu(II) immobilized periodic mesoporous organosilica (PMOs) was synthesized and used as a reusable solid Lewis acid catalyst for the aminolysis of epoxides under solvent-free conditions. An amide-based ligand, L-propylsilyl (1) having a specific binding pocket was prepared and fabricated on mesoporous MCM-41 to produce mesoporous organosilica L-propylsilyl@MCM-41 (2). Further, it has been utilized for anchoring Cu(II) ions under controlled reaction conditions to yield solid Lewis acid catalyst Cu(II)-L-propylsilyl@MCM-41 (3). The synthesized catalyst 3 exhibits significantly higher catalytic activity for aminolysis compared to hitherto known solid Lewis acid catalysts. An extensive range of β-amino alcohols with high regio and stereoselectivity were prepared by using catalyst 3. The catalyst was recovered easily and reused eight times without any loss in its catalytic activity. Furthermore, the synthesis of clinically significant propranolol (β-blocker) from α- naphthyl glycidyl ether was attained successfully using catalyst 3 in a very decent yield.
- Chaudhary, Garima,Gupta, Neha,Singh, Amit Pratap
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- Amberlyst-15: An efficient heterogeneous reusable catalyst for selective anti-Markovnikov addition of thiols to alkenes/alkynes and for thiolysis of epoxides
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The anti-Markovnikov addition of thiols to alkenes/alkynes and thiolysis of epoxides is described using Amberlyst-15 as a selective, commercially available, inexpensive and reusable catalyst. The products like diorganyl sulphides, β-hydroxy sulphides and phenyl(styryl)sulfanes were obtained in good to excellent yields in short reaction time and with high regio-selectivity. The catalyst was reused up to five consecutive recycles without any loss in its catalytic activity. The developed methodology is a metal free protocol for C-S bond formation reaction with high atom economy.
- Lanke, Satish R.,Bhanage, Bhalchandra M.
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- Recyclable superparamagnetic Fe3O4 nanoparticles for efficient catalysis of thiolysis of epoxides
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An efficient and rapid procedure is developed for room-temperature ring opening of various epoxides with thiols under solvent-free conditions in the presence of catalytic amount of superparamagnetic Fe3O4 nanoparticles. As a result,
- Mojtahedi, Mohammad M.,Abaee, M. Saeed,Rajabi, Azam,Mahmoodi, Peyman,Bagherpoor, Saeed
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experimental part
p. 68 - 71
(2012/08/07)
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- (Bromodimethyl)sulfonium bromide-mediated thiolysis of epoxides: An easy access to -hydroxy sulfides and benzoxathiepinones in solvent-free conditions
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A mild, rapid and highly regioselective opening of epoxides by mercaptans to bη-hydroxy sulfides and benzoxathiepinones has been achieved in excellent yields, using catalytic amount of (bromodimethyl)sulfonium bromide in solvent free reaction conditions.
- Shailaja,Manjula,Rao, B. Vittal
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experimental part
p. 3629 - 3639
(2011/02/22)
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- Efficient synthesis of-Hydroxy sulfides and-Hydroxy sulfoxides catalyzed by Cu/MgO under solvent-free conditions
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Regio-, stereo-, and chemoselective ring opening of epoxides with thiols using Cu/MgO as a heterogeneous catalyst has efficiently been carried out to produce the corresponding β-hydroxy sulfides in excellent yields at room temperature under solvent-free c
- Das, Biswanath,Balasubramanyam, Penagaluri,Krishnaiah, Maddeboina,Veeranjaneyulu, Boyapati,Sudhakar, Dega
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experimental part
p. 2113 - 2121
(2010/08/13)
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- Rongalite promoted highly regioselective synthesis of β-hydroxy sulfides by ring opening of epoxides with disulfides
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Rongalite promotes cleavage of disulfides generating thiolate anions that then undergo facile ring opening of epoxides in the presence of K2CO3 to afford α-addition products 3 with good to excellent yields. The important f
- Guo, Wenxue,Chen, Jiuxi,Wu, Dengze,Ding, Jinchang,Chen, Fan,Wu, Huayue
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experimental part
p. 5240 - 5243
(2009/11/30)
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- Cyanuric chloride: An efficient catalyst for ring opening of epoxides with thiols under solvent-free conditions
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2,4,6-Trichloro-1,3,5-triazine-catalyzed convenient and efficient ring opening of epoxides with thiols under solvent-free conditions is described. Short reaction time, mild reaction conditions, inexpensive and readily available catalyst, and excellent yie
- Bandgar, Babasaheb P.,Joshi, Neeta S.,Kamble, Vinod T.,Sawant, Sanjay S.
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p. 231 - 234
(2008/09/18)
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- Additive-free thiolysis of epoxides in water: A green and efficient regioselective pathway to β-hydroxy sulfides
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Room-temperature ring opening of various epoxides with aromatic thiols was carried out in water in the absence of any Lewis acid or additive. High yields of β-hydroxy sulfides with excellent regioselectivity were obtained under very environmentally friend
- Abaee, Saeed M.,Mojtahedi, Mohammad M.,Abbasi, Hassan,Fatemi, Ensieh R.
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p. 282 - 289
(2008/03/17)
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- Highly regioselective ring opening of epoxides with thiols catalyzed by SbCl3 under solvent-free conditions
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The ring-opening reaction of epoxides with thiols by SbCl3 supported on Kieselguhr under solvent-free conditions, afforded high yields of β-hydroxy sulfides. Nucleophilic attack of the thiols occurs regioselectively at the less hindered side of the epoxid
- Ghazanfari, Dadkhoda,Hashemi, Mohammed M.,Akhgar, Mohammad Reza,Foroughi, Mohammad Mehdi,Najafi-Zadeh, Fariba
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experimental part
p. 3018 - 3022
(2009/10/02)
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- Alumina-supported molybdenum (VI) oxide: An efficient and recyclable heterogeneous catalyst for regioselective ring opening of epoxides with thiols, acetic anhydride, and alcohols under solvent-free conditions
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An efficient and simple protocol for regioselective ring opening of epoxides with thiols, acetic anhydride, and alcohols using 16wt% MoO3 supported on alumina as a recyclable catalyst is described. Copyright
- Singhal, Sweety,Jain, Suman L.,Sain, Bir
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p. 620 - 621
(2008/12/21)
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- Facile room-temperature MgBr2·OEt2-catalyzed thiolysis of epoxides under solvent-free conditions
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Solvent-free ring opening of 1,2-epoxides with aromatic and aliphatic thiols under 1 mol% magnesium bromide ethyl etherate catalysis affords rapid formation of β-hydroxy sulfides at ambient temperature with excellent yields. Nucleophilic attack of the thi
- Mojtahedi, Mohammad M.,Abaee, M. Saeed,Bolourtchian, Mohammad,Abbasi, Hassan
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p. 905 - 910
(2008/02/01)
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- Stereo- and regioselective thiolysis of 1,2-epoxides in water
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A simple, efficient, stereoselective, and highly regioselective procedure for the synthesis of β-hydroxy sulfides by thiolysis of various 1,2-epoxides in water as a solvent, using no catalyst and under very mild conditions, is described. Copyright Taylor
- Movassagh, Barahman,Soleiman-Beigi, Mohammad
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p. 3239 - 3244
(2008/02/12)
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- Ionic liquid promoted regio- and stereo-selective thiolysis of epoxides-A simple and green approach to β-hydroxy- and β-keto sulfides
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A variety of epoxides underwent facile cleavage by thiols under the catalysis of 1-methyl-3-butylimidazolium bromide, [bmIm]Br, to produce the corresponding β-hydroxy sulfides with high regio- and stereo-selectivity. On the other hand, a specially designed basic ionic liquid, [bmIm]OH, efficiently catalyzes the thiolysis of ,β-epoxy ketones providing β-keto sulfides through simultaneous retro-aldol cleavages. The reactions are clean, high yielding, and do not require any organic solvent. The catalyst is also recycled. CSIRO 2007.
- Ranu, Brindaban C.,Mandal, Tanmay,Banerjee, Subhash,Dey, Suvendu S.
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p. 278 - 283
(2008/02/11)
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- Indium(I) iodide promoted cleavage of dialkyl disulfides - Application of the Michael addition of thiolate anions to conjugated carbonyl compounds and regioselective ring opening of epoxides
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Indium(I) iodide promotes cleavage of dialkyl disulfides generating thiolate anions that then undergo facile addition to α,β-unsaturated ketones, aldehydes, carboxylic esters, and nitriles under neutral conditions producing corresponding β-ketosulfides or β-cyanosulfides. This strategy has also been used for the regioselective nucleophilic ring opening of epoxides by thiolate anions in presence of indium(III) chloride producing corresponding β-hydroxyphenyl sulfides. The reactions are in general, very clean, high yielding, and reasonably fast. Thus, simple and convenient procedures for the synthesis of β-ketosulfides or β-cyanosulfides and β-hydroxyalkyl sulfides have been developed using this cleavage reaction.
- Ranu, Brindaban C.,Mandal, Tanmay
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p. 762 - 770
(2007/10/03)
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- Solvent-free thiolysis of epoxides under lithium perchlorate catalysis
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Solvent-free ring opening of 1,2-epoxides with thiols using catalytic amounts of lithium perchlorate affords high yields of β-hydroxy sulfides. Nucleophilic attack of the thiols occurs regioselectively at the sterically less hindered side of the epoxides.
- Mojtahedi, Mohammad M.,Abassi, Hassan,Saeed Abaee,Mohebali, Bahareh
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p. 455 - 458
(2007/10/03)
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- BiCl3 catalyzed thiolyzation reaction of 1,2-epoxides with diaryl disulfides in the presence of zinc powder and ionic liquid
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A new and efficient method has been developed for the regio- and chemoselective synthesis of β-hydroxysulfides with the ring-opening reaction of 1,2-epoxides by diaryl disulfides and zinc powder in the presence of a catalytic amount of BiCl3 in
- Khosropour,Khodaei,Ghozati
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p. 2525 - 2531
(2007/10/03)
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- Efficient, eco-friendly and regioselective method for thiolysis of 1,2-epoxides with diaryl disulfides in the presence of Zn/Bi(TFA) 3-TBPB or Zn/Bi(OTf)3-TBPB
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Diaryl disulfides undergo regioselective ring-opening of 1,2-epoxides in the presence of zinc powder and 3-4 mol-% of bismuth(III) trifluoroacetate or 1 mol-% of bismuth(III) triflate in molten tetrabutylphosphonium bromide (TBPB) to afford the correspond
- Khosropour, Ahmad R.,Khodaei, Mohammad M.,Ghozati, Kazem
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p. 572 - 576
(2007/10/03)
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- Lipase-catalyzed separation of the enantiomers of 1-substituted-3-arylthio- 2-propanols
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Optically active (R)- and (S)-1-substituted-3-(arylthio)propan-2-ols have been prepared in the reaction of the appropriate 2-(arylthiomethyl)oxiranes with chloride and azide anions followed by a lipase-catalyzed transesterification. The effects of the enzyme preparation as well as of the reaction conditions have been compared in terms of the enantiomeric excess of the obtained acetate and unreacted alcohol.
- Wielechowska, Monika,Plenkiewicz, Jan
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p. 1199 - 1205
(2007/10/03)
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- Zn/CeCl3.7H2O-TBPB: A new and 'green' promoter system for rapid and regioselective thiolyzation of 1,2-epoxides with aryl disulfides
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A new, efficient, clean, and regioselective 'one-pot' procedure for thiolyzation of epoxides with aryl disultides catalyzed by cerium(III) chloride heptahydrate immobilized on tetrabutyl phosphonium bromide as an ionic liquid is reported.
- Khosropour, Ahmad R.,Khodaei, Mohammad M.,Ghozati, Kazem
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p. 1378 - 1379
(2007/10/03)
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- Regioselective reaction of epoxides with disulfides using Zn/AlCl 3 system: A simple synthesis of β-hydroxy sulfides
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Epoxides are regioselectively cleaved by zinc thiolate intermediate, generated from disulfides in the presence of Zn/AlCl3 system, to afford high yields of the corresponding β-hydroxy sulfides.
- Movassagh,Sobhani,Kheirdoush,Fadaei
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p. 3103 - 3108
(2007/10/03)
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- Kinetic resolution of β- and γ-hydroxy sulfides by fungal lipase from Humicola lanuginosa
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Racemic β- and γ-hydroxy sulfides were resolved by Humicola lanuginosa lipase catalyzed transesterification using vinyl acetate both as acyl donor and solvent. The effect of substituents and spacer length on rate of reaction and enantioselectivity is obse
- Singh, Satwinder,Kumar, Subodh,Chimni, Swapandeep Singh
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p. 231 - 240
(2007/10/03)
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- The First Practical Method of Selective Heteroatom-Directed Chlorohydroxylation
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A new Pd(II)-catalyzed nucleophilic chlorohydroxylation reaction of allylic amines and sulfides was achieved, and the regioselective reaction gives high yields of the chlorohydrin products, which can be transformed into epoxy compounds or aziridine compou
- Lai, Jin-Yu,Wang, Fu-Song,Guo, Guang-Zhong,Dai, Li-Xin
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p. 6944 - 6946
(2007/10/02)
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- Cobalt mediated regioselective ring opening of oxiranes with benzenethiol: A mechanistic study
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: Oxiranes are regioselectively cleaved by benzenethiol in presence of cobalt(II) chloride or Co2(CO)8 to the corresponding β-hydroxy sulfides in good yields. A mechanistic study of this reaction reveals that an electron transfer process is involved in these transformations and the reaction is proceeding via the formation of a carbon-cobalt bond.
- Iqbal, Javed,Pandey, Anu,Shukla, Alka,Srivastava, Rajiv Ranjan,Tripathi, Sanjay
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p. 6423 - 6432
(2007/10/02)
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