Chiral nitrogen ligands

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 1663-45-2, is researched, SMILESS is P(CCP(C1=CC=CC=C1)C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4, Molecular C26H24P2Journal, Nanoscale Advances called Halogen effects on the electronic and optical properties of Au13 nanoclusters, Author is Gao, Ze-Hua; Dong, Jia; Zhang, Qian-Fan; Wang, Lai-Sheng, the main research direction is gold13 nanocluster halogen effect electronic optical property.Synthetic Route of C26H24P2.

We report an exptl. and theor. investigation of the electronic and optical properties of a series of icosahedral Au13 nanoclusters, protected using different halogen ligands (Cl, Br, and I), as well as 1,2-bis(diphenylphosphino)ethane (dppe) ligands. All three clusters are comprised of the same Au13 kernel with two halogens coordinated to the poles of the icosahedral cluster along with five dppe ligands. UV-vis absorption spectra indicate a systematic red shift from Cl to Br to I, as well as a sudden enhancement of the second excitonic peak for the I-coordinated cluster. D. functional theory (DFT) calculations suggest that all clusters possess a wide HOMO-LUMO energy gap of ~1.79 eV and are used to assign the first two excitonic bands. Frontier orbital analyses reveal several HOMO → LUMO transitions involving halogen-to-metal charge transfers. For the I-coordinated cluster, more complicated I-to-metal charge transfers give rise to different excitation features observed exptl. The current findings show that halogen ligands play important roles in the electronic structures of gold clusters and can be utilized to tune the optical properties of the clusters.

There is still a lot of research devoted to this compound(SMILES：P(CCP(C1=CC=CC=C1)C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4)Synthetic Route of C26H24P2, and with the development of science, more effects of this compound(1663-45-2) can be discovered.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Dong, Jie; Yuan, Xiang-Ai; Yan, Zhongfei; Mu, Liying; Ma, Junyang; Zhu, Chengjian; Xie, Jin published an article about the compound: Tri(naphthalen-1-yl)phosphine( cas:3411-48-1,SMILESS:C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2 ).Name: Tri(naphthalen-1-yl)phosphine. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:3411-48-1) through the article.

Transition-metal-catalyzed, redox-neutral dehydrosilylation of alkenes is a long-standing challenge in organic synthesis, with current methods suffering from low selectivity and narrow scope. The authors report a general and simple method for the Mn-catalyzed dehydrosilylation and hydrosilylation of alkenes, with Mn2(CO)10 as a catalyst precursor, by using a ligand-tuned metalloradical reactivity strategy. This enables versatility and controllable selectivity with a 1:1 ratio of alkenes and silanes, and the synthetic robustness and practicality of this method are demonstrated using complex alkenes and light olefins. The selectivity of the reaction was studied using d. functional theory calculations, showing the use of an iPrPNP ligand to favor dehydrosilylation, while a JackiePhos ligand favors hydrosilylation. The reaction is redox-neutral and atom-economical, exhibits a broad substrate scope and excellent functional group tolerance, and is suitable for various synthetic applications on a gram scale. [graphic not available: see fulltext].

There is still a lot of research devoted to this compound(SMILES：C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2)Name: Tri(naphthalen-1-yl)phosphine, and with the development of science, more effects of this compound(3411-48-1) can be discovered.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Application In Synthesis of Tri(naphthalen-1-yl)phosphine. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Tri(naphthalen-1-yl)phosphine, is researched, Molecular C30H21P, CAS is 3411-48-1, about Effect of Gold(I) on the Room-Temperature Phosphorescence of Ethynylphenanthrene. Author is de Aquino, Araceli; Caparros, Francisco J.; Aullon, Gabriel; Ward, Jas S.; Rissanen, Kari; Jung, Yongsik; Choi, Hyeonho; Lima, Joao Carlos; Rodriguez, Laura.

The synthesis of two series of gold(I) complexes with the general formulas PR3-Au-CC-9-phenanthrenyl [1a-c, PR3 = PPh3, PMe3, P(1-Naph)3], PR3-Au-CC-2-phenanthrenyl (2a-c, same PR3) (diphos)(Au-CC-9-phenanthrenyl)2 (1d,e, diphos = dppm, dppb) (diphos)(Au-CC-2-phenanthrenyl)2 (2d,e) has been realized. The two series differ in the position of the alkynyl substituent on the phenanthrene chromophore, being at the 9-position (9-ethynylphenanthrene) for the L1 series and at the 2-position (2-ethynylphenanthrene) for the L2 series. The compounds have been fully characterized by 1H, 31P NMR, and IR spectroscopy, mass spectrometry, and single-crystal X-ray diffraction resolution in the case of compounds 1a, 1e, 2a, and 2c. The emissive properties of the uncoordinated ligands and corresponding complexes have been studied in solution and within organic matrixes of different polarity (polymethylmethacrylate and Zeonex). Room-temperature phosphorescence (RTP) is observed for all gold(I) complexes whereas only fluorescence can be detected for the pure organic chromophore. In particular, the L2 series presents better luminescent properties regarding the intensity of emission, quantum yields, and RTP effect. Addnl., although the inclusion of all the compounds in organic matrixes induces an enhancement of the observed RTP owing to the decrease in non-radiative deactivation, only the L2 series completely suppresses the fluorescence, giving rise to pure phosphorescent materials.

There is still a lot of research devoted to this compound(SMILES：C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2)Application In Synthesis of Tri(naphthalen-1-yl)phosphine, and with the development of science, more effects of this compound(3411-48-1) can be discovered.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Recommanded Product: 14389-12-9. 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. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about pH-dependent synthesis of a cadmium coordination compound from a compound based on Hpytz ligand [Hpytz = 5-(4-pyridyl)tetrazole].

Reactions of CdSO4·6H2O and Hpytz [Hpytz = 5-(4-pyridyl)tetrazole] under high pH values produced a known compound, [Cd(pytz)2(H2O)4]·2H2O (1), which can be used to prepare [Cd(Hpytz)(SO4)(H2O)2] (2) by adjusting the pH to a lower level using H2SO4 under hydrothermal conditions. These compounds were characterized by elemental anal., IR spectroscopy, and single-crystal diffraction. X-ray anal. reveals that 1 features a mononuclear structure, while 2 affords a 1-dimensional polymeric chain structure. Compound 1 displays a 2-dimensional network, while 2 shows a 3-dimensional network by H bonding interactions. Also, the luminescent properties were studied at room temperature in the solid state.

There is still a lot of research devoted to this compound(SMILES：C1(C2=NN=NN2)=CC=NC=C1)Recommanded Product: 14389-12-9, and with the development of science, more effects of this compound(14389-12-9) can be discovered.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Understanding the formation of metal-oxide based inorganic solids: Assessing the influence of tetrazole molecule.Computed Properties of C6H5N5.

The hydrothermal reaction of Cu(II) salt, ammonium heptamolybdate and 4-ptz (5-(4-pyridyl)tetrazole) at different synthetic conditions yields two compounds [Cu(4-Hptz)(Mo2O7)] (1) and [Cu(4-Hptz)2(H2O)3]2[Mo8O26] (2). Both the compounds 1 and 2 were characterized by routine elemental analyses, IR-, thermogravimetric studies and unambiguously characterized by single crystal x-ray crystallog. Compound 1 exhibits a 3-dimensional bimetallic oxide framework, constructed from the tetrazoles and {CuMo2O7} oxide phase. The coordination ability of N atoms in the tetrazole ring makes the ring acting as a template in the formation of {Cu4Mo6O10} rings, made up of [Mo2O7]2- anions and Cu(II) octahedra; the stacking of these {Cu4Mo6O10} rings along crystallog. c axis gave a 3-dimensional bimetallic oxide framework. Compound 2 consists of infinite octamolybdate chains and Cu-tetrazolate complex cation. The formation of oxide phase under hydrothermal conditions is discussed, giving importance of the role of geometry of the tetrazole ring.

There is still a lot of research devoted to this compound(SMILES：C1(C2=NN=NN2)=CC=NC=C1)Computed Properties of C6H5N5, and with the development of science, more effects of this compound(14389-12-9) can be discovered.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

HPLC of Formula: 20198-19-0. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about 2-Aminoquinazolin-4(3H)-one as an Organocatalyst for the Synthesis of Tertiary Amines. Author is Thakur, Maheshwar S.; Nayal, Onkar S.; Upadhyay, Rahul; Kumar, Neeraj; Maurya, Sushil K..

The potential of 2-aminoquinazolin-4(3H)-one as an organocatalyst for the activation of aldehydes via noncovalent interaction for the synthesis of tertiary amines using formic acid as a reducing agent is reported for the first time. The developed protocol demonstrated a dilated substrate scope for aromatic and aliphatic amines with aromatic and aliphatic aldehydes. Furthermore, the current method was also fruitful for the derivatization of ciprofloxacin and its derivative in good to excellent yields.

If you want to learn more about this compound(2-Aminoquinazolin-4(3H)-one)HPLC of Formula: 20198-19-0, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(20198-19-0).

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Quality Control of 1,5-Dibromopentane. 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: 1,5-Dibromopentane, is researched, Molecular C5H10Br2, CAS is 111-24-0, about Accordion-like effect of flexible organic structure-directing agents in the synthesis of ferrierite zeolite. Author is Almeida, Ramon K. S.; Perez-Pariente, Joaquin; Gomez-Hortiguela, Luis.

Ferrierite zeolite was synthesized by a co-structure-directing route using a highly flexible diquaternary ammonium cation (N,N’-bis-triethylpentanediyldiammonium) as a structure directing agent in combination with tetramethylammonium as a small co-structure-directing agent. Strong alterations of the 13C NMR bands of the bulky organic dication upon confinement within the ferrierite framework suggest a change of conformation driven by host-guest interactions. A combination of mol. mechanics and DFT calculations of the theor. 13C NMR chem. shifts allowed to explain the observed differences in the NMR bands of the dication in solution and when hosted in ferrierite: upon confinement, the flexible dication needs to squeeze through the flexible pentyl chain which locates along the 10 MR ferrierite channels in order to host the two bulky tri-Et ammonium groups in adjacent intersections with 8 MR channels. Our work suggests that highly flexible cations, usually considered as less convenient organic structure-directing agents because of low specificity, have the advantage of being able to properly fit with different zeolite cell dimensions through an accordion-like effect by squeezing or stretching their flexible chains.

If you want to learn more about this compound(1,5-Dibromopentane)Quality Control of 1,5-Dibromopentane, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(111-24-0).

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Name: 2-Aminoquinazolin-4(3H)-one. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Aminoquinazolin-4(3H)-one, is researched, Molecular C8H7N3O, CAS is 20198-19-0, about Derivatives of 4-quinazolone as heat stabilizers for poly(vinyl chloride) and vinyl chloride-vinyl acetate copolymers. Author is Kasymova, S. S.; Masharipov, S. M.; Tadzhieva, Kh. S.; Makhmudov, S. A.; Yun, L. M.; Shakhidoyatov, Kh. M..

The stabilizing effect of 4-quinazolone  [491-36-1], 2-amino-4-quinazolone (I) [20198-19-0], 2-amino-3-methyl-4-quinazolone (II) [91810-61-6] and 2-amino-3-methyl-6-nitro-4-quinazolone  [91810-62-7] on PVC  [9002-86-2] and vinyl acetate-vinyl chloride copolymer  [9003-22-9] was studied. The highest heat resistance of the polymers was obtained by stabilization with I, and to a lower degree, with II, whereas the other quinazolone derivatives had no stabilizing effect on the polymers. The effect of mixtures of II with com. stabilizers Ca stearate or Ba-Cd stearate on the heat resistance of PVC depended nonmonotonically on the component ratio, whereas the effect of mixtures of I and other quinazolone derivatives with com. stabilizers increased with increasing content of the former.

If you want to learn more about this compound(2-Aminoquinazolin-4(3H)-one)Name: 2-Aminoquinazolin-4(3H)-one, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(20198-19-0).

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

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.Ollivier, Jean; Dorizon, Philippe; Piras, Pier P.; de Meijere, Armin; Salauen, Jacques researched the compound: Tri(naphthalen-1-yl)phosphine( cas:3411-48-1 ).Recommanded Product: Tri(naphthalen-1-yl)phosphine.They published the article 《Strain, silyl and steric effects on the regioselectivity of palladium(0) catalyzed allyl esters reduction as alternative to the Wittig reaction》 about this compound( cas:3411-48-1 ) in Inorganica Chimica Acta. Keywords: Wittig reaction alternative; olefination reaction; strain effect regioselectivity allyl ester reduction; palladium catalyzed allyl ester reduction; silyl effect regioselectivity allyl ester reduction; steric effect regioselectivity allyl ester reduction. We’ll tell you more about this compound (cas:3411-48-1).

1-(1-Alkenyl)- (I; n =4, R = H, SiMe3, SiEt3, Bu, X = OAc, OCO2Me; n = 1, R = H, SiMe3, Bu, X = OTs) and 1-(1-cycloalkenyl)cycloalkyl esters (acetate, tosylate, mesylate) (II; n = 1, 3, 4; m = 1, 2) underwent palladium(0) catalyzed hydrogenolysis by sodium formate or n-butylzinc chloride as hydride sources. The regioselectivity of the reduction can be monitored either by ring strain, silyl substitution of the allyl moieties or by using the steric effect of trivalent phosphorus ligands related to their cone angles ϑ. Alkylidenecycloalkanes (III) and cycloalkylidenecycloalkanes (IV) have been obtained, generally in good yields, thus providing a convenient alternative to the Wittig olefination and a new access to allylsilanes.

If you want to learn more about this compound(Tri(naphthalen-1-yl)phosphine)Recommanded Product: Tri(naphthalen-1-yl)phosphine, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(3411-48-1).

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 6684-39-5, is researched, Molecular C5H3Cl2NO2S, about Synthesis and biological evaluation of N-(7-indolyl)-3-pyridinesulfonamide derivatives as potent antitumor agents, the main research direction is pyridinesulfonamide indolyl derivative preparation antitumor.Category: chiral-nitrogen-ligands.

The synthesis and antitumor activity of E7070 analogs containing a 3-pyridinesulfonamide moiety is reported. E7070 was selected from our sulfonamide-based compound collections, currently undergoing Phase II clin. trials because of its tolerable toxicity profile and some antitumor responses in the Phase I setting. Of the analogs examined, ER-35745 (I), a 6-amino-3-pyridinesulfonamide derivative, demonstrated significant oral efficacy against the HCT116 human colon carcinoma xenograft in nude mice.

If you want to learn more about this compound(2-Chloro-5-pyridinesulfonyl chloride)Category: chiral-nitrogen-ligands, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(6684-39-5).

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis