Category: catalyst-ligand

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called A highly stereoselective synthesis of anti-HIV 2′,3′-dideoxy- and 2′,3′-didehydro-2′,3′-dideoxynucleosides, published in 1992-07-03, which mentions a compound: 32780-06-6, Name is (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, Molecular C5H8O3, Category: catalyst-ligand.

A general total synthetic method for the stereocontrolled synthesis of 2′,3′-dideoxy- and 2′,3′-didehydro-2′,3′-dideoxynucleosides, is presented. Introduction of an α-phenylselenenyl group at the 2-position of 2,3-dideoxyribosyl acetate directs the glycosyl bond formation to give ≥95% β-isomer. This 2′-phenylselenenyl nucleoside may be converted to either the 2′,3′-dideoxynucleoside by treatment with n-Bu3SnH and Et3B at room temperature or to the unsaturated derivative by treatment with H2O2/cat. pyridine. The application of this method to the syntheses of pyrimidines (ddU, ddT, ddC), 6-substituted purines (ddA, ddT, 6-chloro-ddP, N6-Me-ddA), and 2,6-disubstituted pruines(2-F-ddA, 6-chloro-2-amino-ddP) as well as selected 2′,3′-didehydro-2′,3′-dideoxy derivatives, is reported.

Here is a brief introduction to this compound(32780-06-6)Category: catalyst-ligand, if you want to know about other compounds related to this compound(32780-06-6), you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0 ) is researched.Quality Control of 4-(p-Tolyl)-2,2:6,2-terpyridine.Turonek, Mary L.; Moore, Peter; Errington, William published the article 《Synthesis of the terpyridyl pendant-arm azamacrocycle 4′-(p-1,4,7-triazacyclonon-1-ylmethylphenyl)-2,2′:6′,2”-terpyridine (L) and complexes of L with copper(II) and nickel(II). Crystal structure of [Cu(HL)(H2O)2][PF6]3》 about this compound( cas:89972-77-0 ) in Dalton. Keywords: triazacyclononylmethylphenylterpyridine preparation complexation copper nickel; crystal structure copper triazacyclononylmethylphenylterpyridine complex; copper triazacyclononylmethylphenylterpyridine complex preparation structure electrochem redox; nickel triazacyclononylmethylphenylterpyridine complex preparation electrochem reduction; electrochem redox copper nickel triazacyclononylmethylphenylterpyridine complex. Let’s learn more about this compound (cas:89972-77-0).

The azamacrocyclic ligand 4′-(p-1,4,7-triazacyclonon-1-ylmethylphenyl)-2,2′:6′,2”-terpyridine (L) was prepared, some of the complexes it forms with hydrated Cu(II) and Ni(II) were isolated as the [PF6]- salts. X-ray crystallog. was used to determine the solid state structure of the distorted trigonal bipyramidal complex [Cu(HL)(H2O)2][PF6]3, in which the Cu(II) is coordinated to the terpyridyl group and the azamacrocycle is monoprotonated and noncoordinating. A bis(2,2′:6′,2”-terpyridine)nickel(II) complex, [Ni(H2L2)2][PF6]6 also was isolated, in which each azamacrocycle is diprotonated. Both complexes were studied by cyclic voltammetry.

Here is a brief introduction to this compound(89972-77-0)Quality Control of 4-(p-Tolyl)-2,2:6,2-terpyridine, if you want to know about other compounds related to this compound(89972-77-0), you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine(SMILESS: CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1,cas:89972-77-0) is researched.Quality Control of (S)-(2,2-dimethyl-[1,3]-dioxolan-4-yl)-methylamine. The article 《Bis-tridendate Ir(III) polymer-metallocomplexes: hybrid, main-chain polymer phosphors for orange-red light emission》 in relation to this compound, is published in Polymers (Basel, Switzerland). Let’s take a look at the latest research on this compound (cas:89972-77-0).

In this work, hybrid polymeric bis-tridentate iridium(III) complexes bearing derivatives of terpyridine (tpy) and 2,6-di(phenyl) pyridine as ligands were successfully synthesized and evaluated as red-light emitters. At first, the synthesis of small mol. bis-tridendate Ir(III) complexes bearing alkoxy-, methyl-, or hydroxy-functionalized terpyridines and a dihydroxyphenyl-pyridine moiety was accomplished. Mol. complexes bearing two polymerizable end-hydroxyl groups and methyl- or alkoxy-decorated terpyridines were copolymerized with difluorodiphenyl-sulfone under high temperature polyetherification conditions. Alternatively, the post-polymerization complexation of the terpyridine-iridium(III) monocomplexes onto the biphenyl-pyridine main chain homopolymer was explored. Both cases afforded solution-processable metallocomplex-polymers possessing the advantages of phosphorescent emitters in addition to high mol. weights and excellent film-forming ability via solution casting. The structural, optical, and electrochem. properties of the monomeric and polymeric heteroleptic iridium complexes were thoroughly investigated. The polymeric metallocomplexes were found to emit in the orange-red region (550-600 nm) with appropriate HOMO and LUMO levels to be used in conjunction with blue-emitting hosts. By varying the metal loading on the polymeric backbone, the emitter′s specific emission maxima could be successfully tuned.

Here is a brief introduction to this compound(89972-77-0)Formula: C22H17N3, if you want to know about other compounds related to this compound(89972-77-0), you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 11-Bromoundecanoic acid, is researched, Molecular C11H21BrO2, CAS is 2834-05-1, about Castor Oil-Based Bioplastics via Polyesterification: Synthesis, Characterization, and Functionalization, the main research direction is castor oil based bioplastics polyesterification functionalization.COA of Formula: C11H21BrO2.

Synthesis and application of biobased polymers are at the forefront of polymer science. Herein, we report the synthesis, characterization, and functionalization of castor oil-based bioplastics. At first, polymer P1 was synthesized via polyesterification by using monomer 11-bromoundecanoic acid (1) to demonstrate the feasibility of this step-growth polymerization method. The success of this polycondensation technique relies on the high substitution efficiency between terminal groups, carboxylic acid, and carbon-bromide moieties under alk. conditions. Subsequently, copolymers P2-P5 with varied compositions were obtained by random copolymerization of monomers 1 and 6-bromohexanoic acid (2) in different feed ratios. Linear pos. correlation is disclosed between the crystallization (Tc) and melting (Tm) temperatures of P1-P5 and the molar fraction of 1 within these specimens. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) results illustrate good crystallinity of these bioplastics. Furthermore, the degradation of polymers P1-P5 is propelled by an external basic environment while hindered by their intrinsic hydrophobicity, indicating that alkalinity and composition are two essential factors to manipulate the degradation behaviors of biobased polyesters in the bulk state. Ultimately, polymerization of 1 in the presence of 1-pyrenebutyric acid (3), an end-capping agent, was carried out to yield α-pyrene functionalized polymer P7. This material is capable of serving as a practical fluorescent probe and multiwalled carbon nanotube (MWNT) dispersion stabilizer. Polyesterification reported herein represents a facile and cost-effective synthetic strategy and shows great prospects in sustainable polymer materials.

Here is a brief introduction to this compound(2834-05-1)COA of Formula: C11H21BrO2, if you want to know about other compounds related to this compound(2834-05-1), you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Name: 5,6-Dihydro-2H-pyran-2-one. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 5,6-Dihydro-2H-pyran-2-one, is researched, Molecular C5H6O2, CAS is 3393-45-1, about Electrochemically driven desaturation of carbonyl compounds. Author is Gnaim, Samer; Takahira, Yusuke; Wilke, Henrik R.; Yao, Zhen; Li, Jinjun; Delbrayelle, Dominique; Echeverria, Pierre-Georges; Vantourout, Julien C.; Baran, Phil S..

Electrochem. techniques have long been heralded for their innate sustainability as efficient methods to achieve redox reactions. Carbonyl desaturation, as a fundamental organic oxidation, is an oft-employed transformation to unlock adjacent reactivity through the formal removal of two hydrogen atoms. To date, the most reliable methods to achieve this seemingly trivial reaction rely on transition metals (Pd or Cu) or stoichiometric reagents based on I, Br, Se or S. Here we report an operationally simple pathway to access such structures from enol silanes and phosphates using electrons as the primary reagent. This electrochem. driven desaturation exhibits a broad scope across an array of carbonyl derivatives, is easily scalable (1-100 g) and can be predictably implemented into synthetic pathways using exptl. or computationally derived NMR shifts. Systematic comparisons to state-of-the-art techniques reveal that this method can uniquely desaturate a wide array of carbonyl groups. Mechanistic interrogation suggests a radical-based reaction pathway.

Here is a brief introduction to this compound(3393-45-1)Name: 5,6-Dihydro-2H-pyran-2-one, if you want to know about other compounds related to this compound(3393-45-1), you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov’t, Science (Washington, DC, United States) called Asymmetric syntheses of sceptrin and massadine and evidence for biosynthetic enantiodivergence, Author is Ma, Zhiqiang; Wang, Xiaolei; Wang, Xiao; Rodriguez, Rodrigo A.; Moore, Curtis E.; Gao, Shuanhu; Tan, Xianghui; Ma, Yuyong; Rheingold, Arnold L.; Baran, Phil S.; Chen, Chuo, which mentions a compound: 32780-06-6, SMILESS is O=C1O[C@H](CO)CC1, Molecular C5H8O3, Reference of (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one.

Cycloaddition is an essential tool in chem. synthesis. Instead of using light or heat as a driving force, marine sponges promote cycloaddition with a more versatile but poorly understood mechanism in producing pyrrole-imidazole alkaloids sceptrin, massadine, and ageliferin. Through de novo synthesis of sceptrin and massadine, we show that sponges may use single-electron oxidation as a central mechanism to promote three different types of cycloaddition Addnl., we provide surprising evidence that, in contrast to previous reports, sceptrin, massadine, and ageliferin have mismatched chirality. Therefore, massadine cannot be an oxidative rearrangement product of sceptrin or ageliferin, as is commonly believed. Taken together, our results demonstrate unconventional chem. approaches to achieving cycloaddition reactions in synthesis and uncover enantiodivergence as a new biosynthetic paradigm for natural products.

Here is a brief introduction to this compound(32780-06-6)Reference of (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, if you want to know about other compounds related to this compound(32780-06-6), you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0 ) is researched.SDS of cas: 89972-77-0.Anthonysamy, Arockiam; Balasubramanian, Sengottuvelan; Muthuraaman, Bhagavathiachari; Maruthamuthu, Pichai published the article 《4′-functionalized 2,2′:6′,2” terpyridine ruthenium (II) complex: a nanocrystalline TiO2 based solar cell sensitizer》 about this compound( cas:89972-77-0 ) in Nanotechnology. Keywords: terpyridine ruthenium complex nanocrystalline titanium oxide solar cell sensitizer. Let’s learn more about this compound (cas:89972-77-0).

The synthesis of an Ru(II) complex derived from 4′-[4-[(methacryloyloxy)methyl]phenyl]-2,2′:6′,2”-terpyridine ligand, together with its spectral and electrochem. properties, has been described. The application of this complex, which does not possess the usual anchoring groups like carboxylate or phosphate, in a dye sensitized nanocrystalline TiO2 solar cell has indicated a short circuit current of 0.252 mA, an open circuit potential of 377 mV with an overall efficiency of 3.63%. The overall conversion efficiency of the system remains stable for a long period due to the efficient electron injection into the conduction band during light absorption. The high resolution SEM picture reveals a three-dimensional network of interconnected nanoscale particles, while x-ray diffraction studies show that the particle size is 21 nm.

Here is a brief introduction to this compound(89972-77-0)SDS of cas: 89972-77-0, if you want to know about other compounds related to this compound(89972-77-0), you can read my other articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Computed Properties of CH2Cu2O5. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Basic copper carbonate, is researched, Molecular CH2Cu2O5, CAS is 12069-69-1, about Calcite modification of agricultural waste biochar highly improves the adsorption of Cu(II) from aqueous solutions. Author is Wang, Shenwan; Zhong, Shuang; Zheng, Xiaoyan; Xiao, Dao; Zheng, Lili; Yang, Yang; Zhang, Haide; Ai, Binling; Sheng, Zhanwu.

Calcite-modified biochar was developed as an inexpensive adsorbent for heavy metal immobilization. The biochar was prepared by pyrolysis of coconut shells under a N2 atmosphere at 600°C and then modified by mixing with calcite in an aqueous solution The surface area of the modified coconut biochar (CAL/BC) was relatively small (9.32 m2·g-1). The CAL/BC surface had CO, CO2-3 and CC functional groups. The maximum adsorption capacity of Cu(II) on CAL/BC was 213.9 mg·g-1 at 25°C, and the removal efficiency was maintained at 87.7% even after four adsorption-desorption cycles. The adsorption process was described well by the pseudo-second order model (R2 = 0.9445-0.9976) and Langmuir adsorption model (R2 = 0.9908-0.9934), which meant that monolayer and chem. adsorption dominated. The dominant adsorption mechanisms of Cu(II) on CAL/BC were surface complexation, precipitation, and ion exchange. This study suggests that biochars prepared from two inexpensive materials (calcite and coconut shells) can be used as an adsorbent for effectively removing heavy metals from simulated aqueous solutions

If you want to learn more about this compound(Basic copper carbonate)Computed Properties of CH2Cu2O5, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(12069-69-1).

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Ren, Mengjuan; Zhang, Mengyue; Yang, Huijuan; Shi, Hongzhi researched the compound: (S)-3-(Piperidin-2-yl)pyridine( cas:494-52-0 ).Reference of (S)-3-(Piperidin-2-yl)pyridine.They published the article 《Reducing the nicotine content of tobacco by grafting with eggplant》 about this compound( cas:494-52-0 ) in BMC Plant Biology. Keywords: tobacco eggplant grafting nicotine; Differentially expressed genes; Grafting; Nicotine content; Tobacco; Transcription factors. We’ll tell you more about this compound (cas:494-52-0).

Background: Nicotine is a stimulant and potent parasympathomimetic alkaloid that accounts for 96-98% of alkaloid content. A reduction in the amount of nicotine in cigarettes to achieve a non-addictive level is necessary. We investigated whether replacing tobacco root with eggplant by grafting can restrict nicotine biosynthesis and produce tobacco leaves with ultra-low nicotine content, and analyzed the gene expression differences induced by eggplant grafting. Results: The nicotine levels of grafted tobacco leaves decreased dramatically. The contents of nornicotine, anabasine, NNN, NNK, NAT, total TSNAs and the nicotine of mainstream cigarette smoke decreased, and the contents of amino acids and the precursors of alkaloids increased in grafted tobacco. Eggplant grafting resulted in the differential expression of 440 genes. LOC107774053 had higher degrees in two PPI networks, which were regulated by LOC107802531 and LOC107828746 in the TF-target network. Conclusions: Replacing tobacco root with eggplant by grafting can restrict nicotine biosynthesis and produce tobacco leaves with ultra-low or zero nicotine content. The differential expression of LOC107774053 may be associated with eggplant grafting.

If you want to learn more about this compound((S)-3-(Piperidin-2-yl)pyridine)Reference of (S)-3-(Piperidin-2-yl)pyridine, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(494-52-0).

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Bonneau, Guillaume; Peru, Aurelien A. M.; Flourat, Amandine L.; Allais, Florent researched the compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one( cas:32780-06-6 ).Quality Control of (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one.They published the article 《Organic solvent- and catalyst-free Baeyer-Villiger oxidation of levoglucosenone and dihydrolevoglucosenone (Cyrene): a sustainable route to (S)-γ-hydroxymethyl-α,β-butenolide and (S)-γ-hydroxymethyl-γ-butyrolactone》 about this compound( cas:32780-06-6 ) in Green Chemistry. Keywords: catalyst Baeyer Villiger oxidation levoglucosenone Cyrene hydroxymethylbutenolide hydroxymethylbutyrolactone. We’ll tell you more about this compound (cas:32780-06-6).

A straightforward and sustainable route to (S)-γ-hydroxymethyl-α,β-butenolide (HBO) and (S)-γ-hydroxymethyl-α,β-butyrolactone (2H-HBO), two valuable chem. platforms for the synthesis of fine chems. such as drugs, pheromones, flavors and fragrances, has been optimized using renewable cellulose-based levoglucosenone (LGO) and Cyrene as starting materials and aqueous H2O2 as both a solvent and an oxidizing agent. Combined with short-path distillation, this procedure provides enantiopure HBO and 2H-HBO in yield as high as 72% at the kilo scale.

If you want to learn more about this compound((S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one)Quality Control of (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(32780-06-6).

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI