Phosphate functionalized nonisocyanate polyurethanes with bio-origin, water solubility and biodegradability Eric Kwok Wai Tam, Ning Xi Chong, Ping Sen Choong, Barindra Sana, Abdul Majeed Seayad, Satyasankar Jana, Jayasree Seayad Green Chemistry, 2023 Water-soluble/dispersible, bio-derived, non-toxic and biodegradable nonisocyanate polyurethane (NIPU) phosphate monoesters were synthesized by applying green chemistry principles. Potential applications include personal care and cosmetic products.
Biobased, Biodegradable, and Water-Soluble Amine-Functionalized Non-Isocyanate Polyurethanes for Potential Home Care Application Ping Sen Choong, Kwok Wai Eric Tam, Ning Xi Chong, Abdul Majeed Seayad, Jayasree Seayad, Satyasankar Jana ACS Applied Polymer Materials, 2023 Non-isocyanate polyurethanes (NIPUs) synthesized using bis–/poly(cyclic carbonate) and di-/polyamine monomers provide a safer alternative to conventional polyurethanes (PUs) produced from highly toxic di-/polyisocyanates and di-/polyols. Water-based NIPUs could potentially substitute waterborne PUs, particularly, in applications where the presence of minute amounts of isocyanate impurity in the final PU product might cause severe consequences. Nevertheless, direct syntheses of water-soluble NIPUs are uncommon. Herein, we report a single-step synthesis of water-soluble and bio-derived linear amine-NIPUs by the polyaddition reaction of succinic bis(cyclic carbonate) (SuBCC) with different commercial polyamines. These amine-NIPUs contain secondary (−NH−) or tertiary (−NR−) amine groups in their main chain imparting good water solubility/dispersibility. Consequently, the water-soluble amine-NIPUs were evaluated for their function as anti-soil/dirt redepositioning agents, one of the key ingredients present in laundry detergents used in home care applications. It is demonstrated that amine-NIPUs in this study are effective in retaining >90% whiteness ( L *) of cotton and polyester cloths after model dirt deposition and wash cycle. Remarkably, these polymers were noncytotoxic when tested on human keratinocyte HaCaT cells and non-skin irritants by in vitro skin irritation assay using reconstructed human epidermis, which emphasizes their suitability for home care applications further. The amine-NIPUs were also found to degrade slowly (65% in 32 days) under hydrolytic conditions similar to that of seawater (pH 8.4 at 23 °C) and were biodegradable in activated sludge (up to 66% in 28 days), as determined by Zahn Wellens OECD-302-B assay. This work may pave the way toward the development and utilization of green, sustainable, and biodegradable NIPUs in home care and other applications, replacing the current toxic, nondegradable, and petroleum-based ingredients.
Thermocatalytic CO2 conversion by siliceous matter: a review Mohammadreza Kosari, Alvin M. H. Lim, Yu Shao, Bowen Li, Kelvin M. Kwok, Abdul Majeed Seayad, Armando Borgna, Hua Chun Zeng Journal of Materials Chemistry A, 2022 Silica/silicate-based nanocatalysts have shown great potential for catalytic hydrogenation of CO2 to various value-added chemicals. This review presents the recent development of siliceous matter in this important field of heterogeneous catalysis.
Revamping SiO2 Spheres by Core–Shell Porosity Endowment to Construct a Mazelike Nanoreactor for Enhanced Catalysis in CO2 Hydrogenation to Methanol Mohammadreza Kosari, Uzma Anjum, Shibo Xi, Alvin M. H. Lim, Abdul Majeed Seayad, Emmanuel A. J. Raj, Sergey M. Kozlov, Armando Borgna, Hua Chun Zeng Advanced Functional Materials, 2021 Beyond the catalytic activity of nanocatalysts, the support with architectural design and explicit boundary could also promote the overall performance through improving the diffusion process, highlighting additional support for the morphology‐dependent activity. To delineate this, herein, a novel mazelike‐reactor framework, namely multi‐voids mesoporous silica sphere (MVmSiO2), is carved through a top‐down approach by endowing core‐shell porosity premade Stöber SiO2 spheres. The precisely‐engineered MVmSiO2 with peripheral one‐dimensional pores in the shell and interconnecting compartmented voids in the core region is simulated to prove combined hierarchical and structural superiority over its analogous counterparts. Supported with CuZn‐based alloys, mazelike MVmSiO2 nanoreactor experimentally demonstrated its expected workability in model gas‐phase CO2 hydrogenation reaction where enhanced CO2 activity, good methanol yield, and more importantly, a prolonged stable performance are realized. While tuning the nanoreactor composition besides morphology optimization could further increase the catalytic performance, it is accentuated that the morphological architecture of support further boosts the reaction performance apart from comprehensive compositional optimization. In addition to the found morphological restraints and size‐confinement effects imposed by MVmSiO2, active sites of catalysts are also investigated by exploring the size difference of the confined CuZn alloy nanoparticles in CO2 hydrogenation employing both in‐situ experimental characterizations and density functional theory calculations.
Biobased Nonisocyanate Polyurethanes as Recyclable and Intrinsic Self-Healing Coating with Triple Healing Sites Ping Sen Choong, Ning Xi Chong, Eric Kwok Wai Tam, Abdul Majeed Seayad, Jayasree Seayad, Satyasankar Jana ACS Macro Letters, 2021 Polymer coatings having high amounts of renewable carbon and self-healing properties are highly sought after in a sustainability perspective. We report here the development of bio-/CO2-derived nonisocyanate polyurethane (NIPU) coatings which are recyclable and healable via three different types of healing mechanisms. These NIPUs contain furan rings in their main chain which after cross-linking with bismaleimides form organogels having a thermo-reversible sol-gel transition and solvent-borne coatings with improved properties. Judicial selection of the bismaleimide cross-linker structure enabled us to produce recyclable and intrinsic healable coatings mediated by heat (thermo-healing), moisture (moisture-healing), and, more interestingly, dry conditions at room temperature (self-healing). The intrinsic moisture-healing property of NIPU-based coatings is unprecedented and is mainly due to the presence of hydroxyl functionalities in the NIPU structure. The uniqueness of these cross-linked biobased NIPU as recyclable coatings having triple healing sites present in their structure gives these materials potential for sustainable and functional applications.
Synthesis of Mesoporous Copper Aluminosilicate Hollow Spheres for Oxidation Reactions Mohammadreza Kosari, Abdul Majeed Seayad, Shibo Xi, Sergey M. Kozlov, Armando Borgna, Hua Chun Zeng ACS Applied Materials and Interfaces, 2020 Hollow functional metal silicate materials have received the most interest due to their large inner space, permeable and functional shell, lighter density, and better use of material compared to their solid counterparts. While tremendous success has been made in the synthesis of individual metal silicates with uniform morphology, the synthesis of multi-phase hollow silicates has not been explored yet, although their direct applica-tions could be promising. In this study, mesoporous aluminosilicate spheres (MASS) are transformed to submicrometer copper aluminosilicate hollow spheres (CASHS) via one-pot hydrothermal process. CASHS has a hollow interior with Cu-Al-Si thorn-like moieties in a lamellar struc-ture on its outer shell. The structure and morphology of CASHS are unique and different from the previously reported tubular copper silicates that are emanated from Stöber silica spheres. Herein, we also demonstrate that extent of hollowing in CASHS can be attained by controlling the aluminum content of pristine MASS. The application of CASHS as a potential heterogeneous catalyst has been directed to important oxidation processes such as olefin oxidation and advanced oxidation process (AOP). In cyclohexene oxidation, for instance, high selectivity to cyclohex-2-en-1-one is achieved under moderate conditions using tert-butyl hydroperoxide (TBHP) as the oxidant. CASHS is a robust heterogeneous cata-lyst and is recyclable for this reaction. CASHS-derived catalysts also favor AOP and enhance the removal of cationic dyes together with H2O2 through an adsorption-degradation process.
Efficient [Cu(NHC)]-Catalyzed Multicomponent Synthesis of Pyrroles Tuan Thanh Dang, Abdul Majeed Seayad Chemistry an Asian Journal, 2017 Efficient [Cu(NHC)]-catalyzed syntheses of pyrroles via two and three-component coupling methods are described. Various 1,2-, 1,2,3-, 1,2,3,5- and fully substituted pyrroles were readily accessible through a suitable choice of ketone, primary amine and diol in a three-component reaction. The N-unsubstituted pyrrole formation is also feasible through a two-component reaction involving a β-amino alcohol and a ketone.
Hollow ZSM5 Spheres for Selective CO 2 Hydrogenation M Kosari, AM Seayad, A Borgna, HC Zeng The 29th North American Catalysis Society Meeting , 2025 2025
Compound, a reaction product of said compound and production methods thereof J Seayad, S Jana, AM Seayad US Patent 11,999,821 , 2024 2024 Citations: 3
Crosslinked polymer and related methods thereof S Jana, J Seayad, AM Seayad, PS CHOONG US Patent 11,981,774 , 2024 2024 Citations: 1
Phosphate functionalized nonisocyanate polyurethanes with bio-origin, water solubility and biodegradability EKW Tam, NX Chong, PS Choong, B Sana, AM Seayad, S Jana, ... Green Chemistry 26 (2), 1007-1019 , 2024 2024 Citations: 9
Crosslinked succinic acid based non-isocyanate polyurethanes for corrosion resistant protective coatings PS Choong, W Rusli, AM Seayad, J Seayad, S Jana Progress in Organic Coatings 186, 107961 , 2024 2024 Citations: 28
Polymer comprising a plurality of active amine groups, related polymers and related methods thereof S Jana, J Seayad, AM Seayad, PS CHOONG US Patent App. 18/044,268 , 2023 2023 Citations: 2
Optimizing hollow ZSM-5 spheres (hZSM5) morphology and its intrinsic acidity for hydrogenation of CO2 to DME with copper–aluminum M Kosari, K Lee, C Wang, S Rimaz, S Zhou, E Hondo, S Xi, AM Seayad, ... Chemical Engineering Journal 470, 144196 , 2023 2023 Citations: 11
Biobased, biodegradable, and water-soluble amine-functionalized non-isocyanate polyurethanes for potential home care application PS Choong, KWE Tam, NX Chong, AM Seayad, J Seayad, S Jana ACS Applied Polymer Materials 5 (7), 5503-5513 , 2023 2023 Citations: 15
Thermocatalytic CO 2 conversion by siliceous matter: a review M Kosari, AMH Lim, Y Shao, B Li, KM Kwok, AM Seayad, A Borgna, ... Journal of Materials Chemistry A 11 (4), 1593-1633 , 2023 2023 Citations: 43
Strong coke-resistivity of spherical hollow Ni/SiO2 catalysts with shell-confined high-content Ni nanoparticles for methane dry reforming with CO2 M Kosari, S Askari, AM Seayad, S Xi, S Kawi, A Borgna, HC Zeng Applied Catalysis B: Environmental 310, 121360 , 2022 2022 Citations: 95
Revamping SiO 2 Spheres by Core–Shell Porosity Endowment to Construct a Mazelike Nanoreactor for Enhanced Catalysis in CO 2 Hydrogenation to Methanol M Kosari, U Anjum, S Xi, AMH Lim, AM Seayad, EAJ Raj, SM Kozlov, ... Advanced Functional Materials 31 (47), 2102896 , 2021 2021 Citations: 58
Biobased nonisocyanate polyurethanes as recyclable and intrinsic self-healing coating with triple healing sites PS Choong, NX Chong, EK Wai Tam, AM Seayad, J Seayad, S Jana ACS Macro Letters 10 (5), 635-641 , 2021 2021 Citations: 87
A Novel Modified Cross-Coupling of Phenols and Amines Using Dichloroimidazolidinedione (DCID) K Madankar, J Mokhtari, Z Mirjafary Synlett 31 (17), 1725-1729 , 2020 2020 Citations: 9
Chiral Brønsted acids catalyze asymmetric additions to substrates that are already protonated: Highly enantioselective disulfonimide-catalyzed Hantzsch ester reductions of NH … VN Wakchaure, C Obradors, B List Synlett 31 (17), 1707-1712 , 2020 2020 Citations: 15
Synthesis of mesoporous copper aluminosilicate hollow spheres for oxidation reactions M Kosari, AM Seayad, S Xi, SM Kozlov, A Borgna, HC Zeng ACS applied materials & interfaces 12 (20), 23060-23075 , 2020 2020 Citations: 27
One-Pot Synthesis of N-Arylated Amines by Hydroaminomethylation of 2, 5-Dihydrofuran with Aromatic Amines Z Zheng, L Wang Synthesis 51 (07), 1585-1594 , 2019 2019 Citations: 7
Ethene-1, 1, 2, 2-tetracarbonitrile and Methanol in the Methylating Reaction of Tertiary Amines to the Quaternary Ammonium Compounds of 1, 1-Dicyano-2-methoxy-2-oxoethane-1-ide VР Sheverdov, VV Davydova, OE Nasakin, MA Mar’yasov, ... Synlett 30 (02), 173-177 , 2019 2019 Citations: 6
Efficient Copper‐(N‐Heterocyclic Carbene) Catalyzed Multicomponent Synthesis of Pyrroles AM Seayad, TT Dang Chemistry–An Asian Journal 12, 2383 – 2387 , 2017 2017 Citations: 36
Synthesis of optically active oxazolines by an organocatalytic isocyanoacetate aldol reaction with α-keto esters F Wang, J Chen, Y Huang Synlett 28 (11), 1300-1304 , 2017 2017 Citations: 15
A convenient ruthenium‐catalysed α‐methylation of carbonyl compounds using methanol TT Dang, AM Seayad Advanced Synthesis & Catalysis 358 (21), 3373-3380 , 2016 2016 Citations: 77
MOST CITED SCHOLAR PUBLICATIONS
A powerful Brønsted acid catalyst for the organocatalytic asymmetric transfer hydrogenation of imines S Hoffmann, AM Seayad, B List Angewandte Chemie International Edition 44 (45), 7424-7427 , 2005 2005 Citations: 776
Catalytic Asymmetric Pictet− Spengler Reaction J Seayad, AM Seayad, B List Journal of the American Chemical Society 128 (4), 1086-1087 , 2006 2006 Citations: 606
Recent advances in hydrogen storage in metal‐containing inorganic nanostructures and related materials AM Seayad, DM Antonelli Advanced materials 16 (9‐10), 765-777 , 2004 2004 Citations: 595
Internal olefins to linear amines A Seayad, M Ahmed, H Klein, R Jackstell, T Gross, M Beller Science 297 (5587), 1676-1678 , 2002 2002 Citations: 382
Synthesis of primary amines: first homogeneously catalyzed reductive amination with ammonia T Gross, AM Seayad, M Ahmad, M Beller Organic letters 4 (12), 2055-2058 , 2002 2002 Citations: 320
Copper-catalyzed oxidative amidation of aldehydes with amine salts: synthesis of primary, secondary, and tertiary amides SC Ghosh, JSY Ngiam, AM Seayad, DT Tuan, CLL Chai, A Chen The Journal of Organic Chemistry 77 (18), 8007-8015 , 2012 2012 Citations: 278
Amines made easily: A highly selective hydroaminomethylation of olefins M Ahmed, AM Seayad, R Jackstell, M Beller Journal of the American Chemical Society 125 (34), 10311-10318 , 2003 2003 Citations: 274
Efficient ruthenium-catalyzed N-methylation of amines using methanol TT Dang, B Ramalingam, AM Seayad ACS Catalysis 5 (7), 4082-4088 , 2015 2015 Citations: 229
Palladium Nanoparticles Supported on ZIF-8 as an Efficient Heterogeneous Catalyst for Aminocarbonylation DT Tuan, Y Zhu, JSY Ngiam, SC Ghosh, A Chen, AM Seayad ACS Catalysis 3 (6), 1406–1410 , 2013 2013 Citations: 223
Iron‐Catalyzed Efficient Synthesis of Amides from Aldehydes and Amine Hydrochloride Salts SC Ghosh, JSY Ngiam, CLL Chai, AM Seayad, TT Dang, A Chen Advanced Synthesis & Catalysis 354 (8), 1407-1412 , 2012 2012 Citations: 166
An efficient palladium-catalyzed N-alkylation of amines using primary and secondary alcohols TT Dang, B Ramalingam, SP Shan, AM Seayad ACS Catalysis 3 (11), 2536-2540 , 2013 2013 Citations: 163
Palladium nanoclusters supported on propylurea‐modified siliceous mesocellular foam for coupling and hydrogenation reactions N Erathodiyil, S Ooi, AM Seayad, Y Han, SS Lee, JY Ying Chemistry–A European Journal 14 (10), 3118-3125 , 2008 2008 Citations: 143
Atmospheric pressure aminocarbonylation of aryl iodides using palladium nanoparticles supported on MOF-5 TT Dang, Y Zhu, SC Ghosh, A Chen, CLL Chai, AM Seayad Chemical Communications 48 (12), 1805-1807 , 2012 2012 Citations: 124
On the mechanism of hydroesterification of styrene using an in situ-formed cationic palladium complex A Seayad, S Jayasree, K Damodaran, L Toniolo, RV Chaudhari Journal of Organometallic Chemistry 601 (1), 100-107 , 2000 2000 Citations: 113
Benzimidazolin-2-ylidene N-heterocyclic Carbene complexes of Ruthenium as a Simple Catalyst for the N-alkylation of Amines using Alcohols and Diols AM Seayad, SP Shan, X Xiaoke, B Gnanaprakasam, TT Dang, ... RSC Advances 5 (6), 4434 - 4442 , 2015 2015 Citations: 99
Highly enantioselective titanium-catalyzed cyanation of imines at room temperature AM Seayad, B Ramalingam, K Yoshinaga, T Nagata, CLL Chai Organic letters 12 (2), 264-267 , 2010 2010 Citations: 96
Hydroesterification of styrene using an in situ formed Pd (OTs) 2 (PPh3) 2 complex catalyst A Seayad, AA Kelkar, L Toniolo, RV Chaudhari Journal of Molecular Catalysis A: Chemical 151 (1-2), 47-59 , 2000 2000 Citations: 96
Strong coke-resistivity of spherical hollow Ni/SiO2 catalysts with shell-confined high-content Ni nanoparticles for methane dry reforming with CO2 M Kosari, S Askari, AM Seayad, S Xi, S Kawi, A Borgna, HC Zeng Applied Catalysis B: Environmental 310, 121360 , 2022 2022 Citations: 95
Biobased nonisocyanate polyurethanes as recyclable and intrinsic self-healing coating with triple healing sites PS Choong, NX Chong, EK Wai Tam, AM Seayad, J Seayad, S Jana ACS Macro Letters 10 (5), 635-641 , 2021 2021 Citations: 87
Hydroaminomethylation of olefins using a rhodium carbene catalyst AM Seayad, K Selvakumar, M Ahmed, M Beller Tetrahedron letters 44 (8), 1679-1683 , 2003 2003 Citations: 86