25726-99-2Relevant academic research and scientific papers
Bio-heterogeneous Cu(0)NC@PHA for n-aryl/alkylation at room temperature
Jian Fui, Choong,Lutfor Rahman, Md,Musta, Baba,Sani Sarjadi, Mohd,Sarkar, Shaheen M.,Xin Ting, Tang
, (2021/06/28)
A pure cellulose was derived from waste fibre and it was chemically modified to a hydroxamic acid ligand. The poly(hydroxamic acid) was treated with an aqueous copper solution to afford the greenish stable five-membered copper complex; namely Cu(II)@PHA. Further, the Cu(II)@PHA was treated with a reducing agent hydrazine hydride to give brown colour cellulose supported copper nanocomplex (Cu(0)NC@PHA). The Cu(0)NC@PHA was characterised by ATR-FTIR, FE-SEM & EDS, TEM, ICP-OES, TGA, XRD and XPS analyses. The cellulose-based Cu(0)NC@PHA was used for the n-aryl/alkylation (Michael addition) reaction with a variety of α,β-unsaturated Michael acceptors to produce the corresponding n-aryl/alkyl products with an excellent yield at room temperature. The Cu(0)NC@PHA showed extraordinary stability and it was easily filtered out from the reaction mixture and may potentially recycled up to five times without loss of its original catalytic ability.
Tapioca cellulose based copper nanoparticles for chemoselective N-alkylation
Islam, Md. Shaharul,Mandal, Bablu Hira,Biswas, Tapan Kumar,Rahman, Md. Lutfor,Rashid,Tan, Suat-Hian,Sarkar, Shaheen M.
, p. 550 - 557 (2017/01/05)
Biomaterials as a support for catalysts are of prime importance. Tapioca root which is an abundant biopolymer source was used to synthesize cellulose supported bio-heterogeneous poly(hydroxamic acid) copper nanoparticles (CuN@PHA) and was characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), transmission electron microscopy (TEM) analyses. The tapioca cellulose supported CuN@PHA (50 mol ppm) effectively catalyzed N-alkylation reaction of aliphatic amines with α,β-unsaturated compounds to give the corresponding alkylated products. High yields up to 95% were achieved for the converted products. The reusability of the cellulose supported nanoparticles was found to be excellent with no significant reduction of its catalytic activity over several cycles. The catalyst showed high catalytic activity having turnover number (TON) 18000 and turnover frequency (TOF) 2250 h-1.
Waste corn-cob cellulose supported bio-heterogeneous copper nanoparticles for aza-Michael reactions
Sarkar, Shaheen M.,Sultana,Biswas, Tapan Kumar,Rahman, Md. Lutfor,Yusoff, Mashitah Mohd
, p. 497 - 502 (2016/01/12)
Bio-heterogeneous poly(amidoxime) copper nanoparticles were prepared on the modified surface of waste corn-cob cellulose through a graft copolymerization process. The Cu-nanoparticles (0.05 mol% to 50 mol ppm) selectively promoted the aza-Michael reaction of aliphatic amines to give the corresponding alkylated products at room temperature in methanol. The supported nanoparticles were easy to recover and reused eight times without a significant loss of their activity.
Graphene oxide: An efficient and reusable carbocatalyst for aza-Michael addition of amines to activated alkenes
Verma, Sanny,Mungse, Harshal P.,Kumar, Neeraj,Choudhary, Shivani,Jain, Suman L.,Sain, Bir,Khatri, Om P.
supporting information; experimental part, p. 12673 - 12675 (2012/01/05)
Graphene oxide was found to be a highly efficient, reusable and cost-effective organocatalyst for the aza-Michael addition of amines to activated alkenes to furnish corresponding β-amino compounds in excellent yields. The Royal Society of Chemistry 2011.
An efficient biomaterial supported bifunctional organocatalyst (ES-SO 3- C5H5NH+) for the synthesis of β-amino carbonyls
Verma, Sanny,Jain, Suman L.,Sain, Bir
experimental part, p. 2314 - 2318 (2011/05/02)
A biomaterial supported organocatalyst, readily synthesized by the reaction of chemically modified sulfonic group containing expanded corn starch with pyridine exhibited excellent catalytic activity for the synthesis of β-amino carbonyls in excellent yields via aza-Michael addition of amines to electron deficient alkenes. A remarkable enhancement in the reaction rates was observed with the prepared bifunctional organocatalyst in comparison to the either starch grafted sulfonic acid or the corresponding homogeneous pyridinium p-toluenesulfonate.
An effective aza-michael addition of aromatic amines to electron-deficient alkenes in alkaline Al2O3
Ai, Xin,Wang, Xin,Liu, Jin-Ming,Ge, Ze-Mei,Cheng, Tie-Ming,Li, Run-Tao
experimental part, p. 5373 - 5377 (2010/08/06)
Aza-Michael addition of aromatic or aliphatic amines with various electron-deficient alkenes was performed using alkaline Al2O 3 as solid media at room temperature afforded the corresponding Michael addition products in good to excellent yields.The alkaline Al 2O3 can be easily recovered and reused.
Silicon tetrachloride catalyzed aza-michael addition of amines to conjugated alkenes under solvent-free conditions
Azizi, Najmedin,Baghi, Roya,Ghafuri, Hossein,Bolourtchian, Mohammad,Hashemi, Mohammad
experimental part, p. 379 - 382 (2010/04/03)
The efficient and very simple conjugate addition of aromatic and aliphatic amines to α,β-unsaturated carbonyl compounds under solvent-free conditions in the presence of catalytic amount of silicon tetrachloride is reported. The reaction of aryl and alkyl amines with different Michael acceptors gave the corresponding Michael adducts with simple catalyst and good to excellent yields. Georg Thieme Verlag Stuttgart New York.
Microwave-assisted, rapid, solvent-free aza-michael reaction by perchloric acid impregnated on silica gel
Singh, Surya Prakash,Kumar, T. Vijaya,Chandrasekharam,Giribabu,Reddy, P. Yella
experimental part, p. 3982 - 3989 (2009/12/24)
Highly efficient solvent-free aza-Michael additions of a variety of amines to,-unsaturated carbonyl compounds under microwave-irradiation conditions catalyzed by perchloric acid impregnated on silica gel (HClO4/SiO2) is reported. The reactions are completed within 2-7min in a microwave oven to produce the corresponding adducts in excellent yields, and the catalyst can be recovered and reused.
Solvent free base catalysis and transesterification over basic functionalised Metal-Organic Frameworks
Savonnet, Marie,Aguado, Sonia,Ravon, Ugo,Bazer-Bachi, Delphine,Lecocq, Vincent,Bats, Nicolas,Pinel, Catherine,Farrusseng, David
experimental part, p. 1729 - 1732 (2011/03/20)
Metal-Organic Frameworks (post-)functionalised with nitrogen containing moieties undergo solvent free aza-Michael condensation and transesterification, surpassing molecular and functionalised MCM-type analogues. The Royal Society of Chemistry 2009.
Triethylammonium acetate (TEAA): A recyclable inexpensive ionic liquid promotes the chemoselective aza- and thia-Michael reactions
Verma, Akhilesh K.,Attri, Pankaj,Chopra, Varun,Tiwari, Rakesh K.,Chandra, Ramesh
experimental part, p. 1041 - 1047 (2009/11/30)
A new, highly efficient, inexpensive, recyclable, mild, convenient, and green protocol for chemoselective aza/thia-Michael addition reactions of amines/thiols to α,β-unsaturated compounds using triethylammonium acetate (TEAA) ionic liquid was developed. The catalyst can be recycled ten times and obviate the need for toxic and expensive catalysts.
