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91.
The addition of α-keto amides as a NH-acid to alkyl propiolates and dialkyl acetylenedicarboxylates in the presence of a catalytic amount of triphenylphosphine gives the corresponding substituted alkyl acrylates. 相似文献
92.
93.
Cviklinski J. Tajbakhsh A.R. Terentjev E.M. 《The European physical journal. E, Soft matter》2002,9(1):427-434
The European Physical Journal E - The macroscopic shape of liquid-crystalline elastomers strongly depends on the order parameter of the mesogenic groups. This order can be manipulated if... 相似文献
94.
We report a combined theoretical and experimental study of linear viscoelastic response in oriented monodomain nematic elastomers. The model predicts a dramatic decrease in the dynamic modulus in certain deformation geometries in an elastic medium with an independently mobile internal degree of freedom, the nematic director with its own relaxation dynamics. Dynamic mechanical measurements on monodomain nematic elastomers confirm our predictions of dependence on shear geometry and on nematic order, and also show a very substantial mechanical loss clearly associated with director relaxation. 相似文献
95.
Maryam Maleki Seyed Meysam Baghbanian Mahmood Tajbakhsh 《Journal of the Iranian Chemical Society》2018,15(2):359-368
A new magnetic oxidation catalyst was prepared using immobilization of tungstophosphoric acid on poly(N-vinylimidazole) entrapped magnetic nanozeolite and characterized by FTIR, TGA, XRD, SEM, TEM, EDX, VSM, and ICP-OES. The resulting heterogeneous catalyst displays high catalytic performance for selective oxidation of alcohols compared to the other catalysts. The catalyst could be reused eight times without any loss of catalytic activity. 相似文献
96.
97.
Rahman Hosseinzadeh Mahmood Tajbakhsh Hamid Khaledi Keivan Ghodrati 《Monatshefte für Chemie / Chemical Monthly》2007,93(1):871-873
Ethylenebis(N-methylimidazolium) chlorochromate was prepared by addition of N-methylimidazole to 1,2-dibromoethane to form the corresponding dibromide salt and subsequent treatment of this salt with
CrO3 in 6N HCl solution. It is a stable yellow-orange solid, which oxidized thiols to the corresponding disulfides at room temperature.
Selective oxidation of thiols in the presence of sulfides and hydroxyl groups was also achieved with this reagent. 相似文献
98.
Akbar Heydari Samad Khaksar Maryam Esfandyari Mahmoud Tajbakhsh 《Tetrahedron letters》2007,48(7):1135-1138
A simple and convenient procedure for direct reductive amination of aldehydes and ketones with sodium borohydride is described. The reaction has been carried out in methanol in the presence of a catalytic amount of H3PW12O40 (0.5 mol %). α,β-Unsaturated aldehydes and ketones can be easily converted into the corresponding allyl alcohols by reaction with H3PW12O40 (0.5 mol %)/NaBH4. 相似文献
99.
Heshmatollah Alinezhad Mahmood Tajbakhsh Fatemeh Salehian 《Monatshefte für Chemie / Chemical Monthly》2005,43(9):2029-2033
A variety of aliphatic and aromatic aldehydes and ketones were efficiently reduced to their corresponding amines when treated
with primary and secondary amines and NaBH4 in micellar media at room temperature under neutral conditions. 相似文献
100.
Farajollah Mohanazadeh Mostafa Hosini Mahmoud Tajbakhsh 《Monatshefte für Chemie / Chemical Monthly》2005,8(10):2041-2043
Reduction of aldehydes and ketones to the corresponding alcohols was achieved in a simple procedure using the system sodium
borohydride and ammonium carbonate. This system needs lower excesses of reducing agent and leads to significantly shortened
reaction times. 相似文献