Purpose With the help of basic physics, application computer algorithms in form recent advances such as machine learning and neural networking textile Industry has been discussed this review. Scientists have linked underlying structural or chemical science materials discovered several strategies for completing some most time-consuming tasks with ease precision. Since 1980s, used to aid majority testing process. rise demand automation, deep learning, networks, these two now handle quality...

Abstract Selective hydrolytic oxidation of organohydrosilanes was achieved with water in the presence Pt‐nanoparticle catalyst. The selectivity process established by NMR analysis. In addition, various Pt‐based catalysts were screened to compare activity and Pt‐nanoparticles catalysis. method equally applicable hydrosilanes bearing unsaturated functional groups, which led corresponding silanols under mild reaction conditions without formation any side products. catalysis studied details...

A series of alkali and alkaline earth (Ae) metal complexes bearing 1,2-phenylene(bis-diphenylphosphinothioic/selenoic amine) [{Ph2 P(E)NH}2 C6 H4 ] (E=S (1-H2); Se (2-H2) ligands are reported. Alkali P(S)N}2 ]Na(THF)4 (3 a) P(Se)N}2 b), ]K(THF)5 (4 b) were obtained in good yield by treating protic 1-H2 or 2-H2 with hexamethyldisilazides [MN(SiMe3 )2 (M=Na K) at ambient temperature. The Ae formulated as P(E)N}2 ]M(THF)3 [E=S, M=Ca (5 a), Sr (6 Ba (7 a); E=Se, b)] can be synthesized using two...

We report the preparation of alkali and alkaline earth (Ae) metal complexes supported by 2-picolylamino-diphenylphosphane chalcogenide [(Ph2P(=E)NHCH2(C5H4N)] [E = S (1-H); Se (2-H)] ligands. The treatment protic ligand, 1-H or 2-H, with hexamethyldisilazides at room temperature afforded corresponding salts [M(THF)2(Ph2P(=E)NCH2(C5H4N)] [M Li, E (3a), (3b)] [{M(THF)n(Ph2P(=E)NCH2(C5H4N)}2] Na, (4a), (4b); M K, (5b)] in good yield. homoleptic Ae [κ2-(Ph2P(=Se)NCH2(C5H4N)Mg(THF)] (6b)...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlavidin. A Novel 9,10-Dihydrophenanthrene Derivative of the Orchids Coelogyne flavida, Pholidota articulata and Otochilus fuscaP. L. Majumder, N. Datta, A. K. Sarkar, J. ChakrabortiCite this: Nat. Prod. 1982, 45, 6, 730–732Publication Date (Print):November 1, 1982Publication History Published online1 July 2004Published inissue 1 November 1982https://pubs.acs.org/doi/10.1021/np50024a016https://doi.org/10.1021/np50024a016research-articleACS...

An organomagnesium complex containing an imino-phosphanamidinate ligand was found to be a competent catalyst for the ROP of rac-LA and ε-CL as well their copolymerization via sequential addition monomers, resulting in formation PCL-b-PLA diblock copolymer. The polymers obtained were characterized by 1H, 13C, DOSY NMR, DSC, TGA, POM, SEM.

The fourth industrial revolution, Industry 4.0, has revolutionized manufacturing through the integration of advanced information technologies (IT) such as Internet Things (IoT), artificial intelligence (AI), big data analytics, and cyber-physical systems. This transformation encompasses smart production systems, supply chain digitalization, mass customization capabilities, driving unprecedented levels efficiency innovation. Through implementation digital twins, edge computing, collaborative...

Designing a multimetallic catalyst based on the principle of metalloenzymes has emerged as promising route to enhance catalytic performance owing combined action different metal centers in cooperative fashion. The cooperativity with surrounding ligand environment plays crucial role driving efficient catalysis. However, replication such synthetic system is very challenging. In this work, we report synthesis and characterization diverse cesium coordination polymeric networks, 2D sheet,...

A mild, selective and facile synthesis of vinylsilanes via a recyclable platinum nanoparticle catalysed hydrosilylation alkynes is reported. Various functionalized are selectively hydrosilylated to furnish functional β-E in high yields. The catalytic effectiveness, ease catalyst recovery recyclability the polysiloxane stabilized Pt-nanoparticle major achievements this work. Detailed situ characterization using Electron Microscopy controlled poisoning experiments supports participation...

Abstract A mild and low‐temperature synthesis of nylon‐6 is achieved through the ring‐opening polymerization ϵ‐caprolactam using barium σ‐borane complex as catalyst. Due to nature catalyst, this protocol provides an easy means synthesizing nylon‐6, for first time with a precise predictable molecular weight. From various model experiments, it evident that σ‐coordinated boron hydride acts donor in step reaction generate lactamate anions, which then undergo in‐situ remaining caprolactam...

The cooperativity of van der Waals interactions in biomolecules and supramolecular assemblies has drawn significant scientific attention due to its offering seamless opportunities generate new materials. However, the potential such synthetic polymers not yet been explored. In this study, we demonstrate a strategy achieve via enhancement weak designed siloxane copolymer. Segmentation copolymer with specific alkyl chain length (C18) induces interaction among chains, resulting interdigitated as...

Catalytic ring opening polymerization (ROP) of <italic>rac</italic>-lactide, ε-caprolactone, and δ-valerolactone using alkali metal (Li, Na, K) complexes as competent catalysts are reported.

A cesium imino-phosphanamidinate, [{NHIDippP(Ph)NDipp}Cs], enabling efficient ring-opening (co)polymerization of rac-LA and ε-CL is disclosed. Owing to the highly controlled polymerization, precise di-block copolymers (PLA-b-PCL) with different block lengths can be produced by a simple one-pot reaction. NMR, GPC, DSC microscopic analyses confirm production crystalline properties.

Abstract A novel amidophosphine sulfur‐supported magnesium complex, [Ph 2 P(S)NCH CH N−(CH )O]Mg(C 4 H 9 )(THF)] ( ) enabling efficient ring‐opening polymerization of rac ‐lactide (LA) and ϵ‐caprolactone (CL) is disclosed. Achieved incredible selectivity for ROP the first time using a catalyst affording isoselective PLA with P i value 0.77. The ‐LA as well ϵ‐CL proceeded under mild reaction conditions in absence any external initiator, to yield corresponding polyesters great control over...

A series of high-performance imine-spaced aromatic polyamide materials, prepared with excellent control molecular weights and polydispersity index from catalytic ring-opening polymerization quinazolinones using a cesium catalyst, are reported.

A thorough comprehensive microstructure analysis of poly(dimethylsiloxane-co-hydromethylsiloxane) copolymers (PDMS-co-PHMS) was achieved using high resolution two-dimensional NMR (29Si/1H) techniques viz. heteronuclear multiple bond coherence (HMBC) and total correlation spectroscopy (TOCSY) in conjunction with 1D 29Si 1H spectroscopy. rigorous the splitting patterns along axes hydromethylsiloxane, [−OSi(H)Me−]/"DH" units dimethylsiloxane, [−OSi(Me)2−]/"D"units PDMS-co-PHMS revealed...

Abstract Alkaline earth (Ae) metal complexes of the aminophosphine borane ligand are highly active and iso‐selective catalysts for ring‐opening polymerization (ROP) rac ‐lactide (LA). The reactions well controlled produce polylactides with molecular weights that precise narrowly distributed. Kinetic studies reveal ROP ‐LA catalyzed by all Ae had a first‐order dependency on LA concentration as catalyst concentration. A plausible reaction mechanism complex‐mediated is discussed, based kinetic...

The ring-opening polymerization (ROP) of ε-caprolactone (CL) catalyzed by metal-free initiator N, N’-dibutyl- N’, N'- tetramethylethane- 1, 2-diammonium bromide [nBuMe2NCH2CH2NnBuMe2]Br2 (DBTMEDA)Br2 has been investigated. catalyst promotes...