Month: April 2022

Recommanded Product: 15227-42-6. 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: cis-Dichlorobis(pyridine)platinum(II), is researched, Molecular C10H10Cl2N2Pt, CAS is 15227-42-6, about Synthesis, characterization and cytotoxicity of some palladium(II), platinum(II), rhodium(I) and iridium(I) complexes of ferrocenylpyridine and related ligands. Crystal and molecular structure of trans-dichlorobis(3-ferrocenylpyridine)palladium(II). Author is Rajput, Jaisheila; Moss, John R.; Hutton, Alan T.; Hendricks, Denver T.; Arendse, Catherine E.; Imrie, Christopher.

The preparation of a series of ferrocenyl nitrogen donor ligands including ferrocenylpyridines, ferrocenylphenylpyridines and 1,1′-di(2-pyridyl)ferrocene is described. Coordination studies of the substituted pyridines (L) were carried out with platinum, palladium, rhodium and iridium. This resulted in the preparation of the following types of complexes: [MCl(CO)2(L)] and [M(cod)(L)2]ClO4 where M = Rh or Ir, cod = 1,5-cyclooctadiene; [M’Cl2(L)2] where M’ = Pt or Pd. The X-ray crystal structure of trans-dichlorobis(3-ferrocenylpyridine)palladium was obtained. The complexes were screened for activity against two human cancer cell lines. At least two of the complexes displayed growth inhibition similar to that of the widely used chemotherapeutic agent, cisplatin.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

Recommanded Product: 1452-77-3. 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: Picolinamide, is researched, Molecular C6H6N2O, CAS is 1452-77-3, about Spectroscopic and electrochemical recognition of H2PO-4 based on a ruthenium complex with 2-picolinamide. Author is Gong, Zhong-Liang; Zhong, Yu-Wu.

A ruthenium polypyridyl complex 4(PF6) with 2-picolinamide as an anionic NN̂ bidentate ligand is synthesized and characterized, including single-crystal X-ray anal. As an effective anion receptor in CH2Cl2, complex 4(PF6) shows selective spectroscopic and electrochem. recognition towards H2PO-4 over other anions tested (F-, Cl-, Br-, I-, HP2O3-7, HSO-4, AcO- and NO-3). Job’s plot and mass spectral analyses support that an adduct is formed between 4 and H2PO-4 with a 1:2 binding stoichiometry. The absorption spectral titration of 4(PF6) with H2PO-4 yields a global association constant in the order of 108 L2·mol-2 and an optical detection limit of 1.4 x 10-6 mol·L-1. In response to the presence of H2PO-4, the Ru(II/III) redox couple of 4(PF6) displays a “”two-wave behavior”” accompanied by a large neg. shift from +0.74 to +0.45 V vs Ag/AgCl. 1H NMR spectral titration analyses suggest that effective hydrogen-bonding interactions are present between 4 and H2PO-4, which are believed responsible for the observed spectroscopic and electrochem. response of 4(PF6) toward H2PO-4.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

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: 15227-42-6, is researched, SMILESS is [Cl-][Pt+2]([N]1=CC=CC=C1)([Cl-])[N]2=CC=CC=C2, Molecular C10H10Cl2N2PtJournal, Inorganic Chemistry called Activation of the trans geometry in platinum antitumor complexes. Synthesis, characterization, and biological activity of complexes with the planar ligands pyridine, N-methylimidazole, thiazole, and quinoline. Crystal and molecular structure of trans-dichlorobis(thiazole)platinum(II), Author is Van Beusichem, Marijo; Farrell, Nicholas, the main research direction is antitumor platinum chloro nitrogen donor complex; crystal structure platinum chloro thiazole complex.Recommanded Product: cis-Dichlorobis(pyridine)platinum(II).

The presence of planar ligands in trans-[PtCl2(py)2] greatly enhances the cytotoxicity of such species, with respect both to their corresponding cis isomer and also to trans-[PtCl2(NH3)2]. The cytotoxicity of trans-[PtCl2(py)2] in murine tumor cell lines is equivalent to the anticancer drug cisplatin, cis-[PtCl2(NH3)2]. The generality of this effect was studied for a range of structures with planar ligands of formula trans-[PtCl2(L)(L’)]. Three distinct series were examined-(1) L = L’ = py, N-methylimidazole (N-MeIm), and thiazole (Tz), (2) L = quinoline (quin), L’ = MeRSO where (R = Me, CH2Ph, Ph), and (3) L = quinoline, L’ = NH3. The synthesis and chem. characterization of all new complexes are described. An x-ray crystal structure determination for trans-[PtCl2(Tz)2] confirmed the geometry with N-bound thiazole. The crystals are monoclinic, space group C2/c, a 8.088(3), b 14.964(4), c 8.847(2) Å, β 99.50(2), Z = 4, R = 0.0545, Rw = 0.0655. Pt has the expected square planar coordination with l(Pt-Cl) = 2.300(5) Å and l(Pt-N) = 2.024(18) and 2.077(17) Å. Bond angles are normal with N(1)-Pt-N(2) = 180.0(1)°, N(1)-Pt-Cl(1) = 90.4(1)°, and N(2)-Pt-Cl(1A) = 89.6(1)°. The intensity data were collected with MoKα radiation with λ = 0.71073 Å. The thiazole rings are not coplanar but slightly tilted to each other at an angle of 14.3°. The dihedral angles between the Pt coordination plane and the thiazole rings are 119.3 and 105.0°. The biol. studies confirm the generality of activation of the trans geometry using planar ligands. Cytotoxicity tests in murine leukemia (L1210) cell lines both sensitive and rendered resistant to cisplatin show that the complexes show equivalent cytostatic activity to that of cisplatin. The activity is an order of magnitude greater than trans-[PtCl2(NH3)2]. The cytotoxicity is further marked by consistent activity in the cisplatin-resistant cell line. Contrary to the well-established but empirical structure-activity relationships, the trans geometry can give platinum complexes with cytotoxicity equivalent to that of the analogous cis isomer. The results point to a further source of platinum antitumor complexes acting by a different mol. mechanism to cisplatin with potential for antitumor activity complementary to that of the clin. used drug.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: cis-Dichlorobis(pyridine)platinum(II), is researched, Molecular C10H10Cl2N2Pt, CAS is 15227-42-6, about Preparation and spectroscopic investigations of platinum complexes. I. Interpretation of the spectra of inverse electron transfer and ligand field transitions of platinum(II) complexes with halide and nitrogen ligands, the main research direction is platinum inverse charge transfer; halide pyridine platinum UV.Category: tetrahydroisoquinoline.

Inverse electron-transfer transitions of the type, 5d(Pt) → π(L), were detected in the electronic absorption spectra of cis- and trans-PtL2X2 complexes in which N-containing ligands have an internal π-electron system (L = pyridine, 3- or 4-chloropyridine, 3,5-dichloropyridine, 4-pentyl- or 4-cyanopyridine, or piperidine; X = Cl, Br, or I). In addition to ligand-field (d-d) and ligand π-π* transitions, 3 charge-transfer transitions were distinguished in the spectra of these complexes in CH2Cl2 or cyclohexane solutions Quant. correlation was established between energy of the ligand field transitions and energy of the inverse charge-transfer transitions.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: cis-Dichlorobis(pyridine)platinum(II)(SMILESS: [Cl-][Pt+2]([N]1=CC=CC=C1)([Cl-])[N]2=CC=CC=C2,cas:15227-42-6) is researched.Related Products of 1452-77-3. The article 《Experimental and theoretical study of the cytotoxic activity of new tetrazole-containing cisplatin analogues and their trans-isomers》 in relation to this compound, is published in Doklady Natsional’noi Akademii Nauk Belarusi. Let’s take a look at the latest research on this compound (cas:15227-42-6).

Quantum chem. calculations within the framework of DFT were carried out for a set of platinum (II) complexes with nitrogen-containing heterocycles. A phys. interpretable QSAR model was developed and a correlation between the biol. activity and structural properties was obtained by means of the multiple linear regression method. The range of new tetrazole-containing platinum (II) complexes was synthesized, and their cytotoxic activity was exptl. determined and compared with the values predicted by the QSAR model. Crucial properties of compounds and their relationship with the mode of action were discussed.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

Li, Kai; Sun, Hongjian; Yang, Wenjing; Wang, Yajie; Xie, Shangqing; Li, Xiaoyan; Fuhr, Olaf; Fenske, Dieter published the article 《Efficient dehydration of primary amides to nitriles catalyzed by phosphorus-chalcogen chelated iron hydrides》. Keywords: nitrile preparation; primary amide dehydration phosphorus chalcogen chelated iron hydride catalyst.They researched the compound: Picolinamide( cas:1452-77-3 ).Related Products of 1452-77-3. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:1452-77-3) here.

A series of phosphorus-chalcogen chelated hydrido iron (II) complexes, (o-(R’2P)-p-R-C6H4Y)FeH(PMe3)3I (R = H, Me; R’ = iPr, Ph; Y = O, S, Se) were synthesized. The catalytic performances of I for dehydration of amides to nitriles were explored by comparing three factors: (1) different chalcogen coordination atoms Y; (2) R’ group of the phosphine moiety; (3) R substituent group at the Ph ring. It is confirmed that I (R = H; R’ = Ph; Y = S) with S as coordination atom has the best catalytic activity and I (R = H; R’ = Ph; Y = Se) with Se as coordination atom has the poorest catalytic activity among complexes I (R = H; R’ = Ph; Y = O), I (R = H; R’ = Ph; Y = S) and I (R = H; R’ = Ph; Y = Se). Electron-rich complex I (R = Me; R’ = iPr; Y = O) is the best catalyst among the seven complexes and the dehydration reaction was completed by using 2 mol% catalyst loading at 60° with 24 h in the presence of (EtO)3SiH in THF. Catalyst I (R = Me; R’ = iPr; Y = O) has good tolerance to many functional groups. Among the seven iron complexes, new complexes I (R = H, Me; R’ = iPr; Y = O) were obtained via the O-H bond activation of the preligands o-iPr2P(C6H4)OH and o-iPr2P-p-Me-(C6H4)OH by Fe(PMe3)4. Both I (R = H, Me; R’ = iPr; Y = O) were characterized by spectroscopic methods and X-ray diffraction anal. The catalytic mechanism was exptl. studied and also proposed.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

Category: tetrahydroisoquinoline. 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: Picolinamide, is researched, Molecular C6H6N2O, CAS is 1452-77-3, about Novel thiazolinyl-picolinamide based palladium(II) complex-impregnated urinary catheters quench the virulence and disintegrate the biofilms of uropathogens. Author is Rajkumar, Deeksha; Rubini, Durairajan; Sudharsan, M.; Suresh, D.; Nithyanand, Paramasivam.

Pseudomonas aeruginosa and Serratia marcescens are prominent members belonging to the group of ESKAPE pathogens responsible for Urinary Tract Infections (UTI) and nosocomial infections. Both the pathogens regulate several virulence factors, including biofilm formation through quorum sensing (QS), an intercellular communication mechanism. The present study describes the anti-biofilm and QS quenching effect of thiazolinyl-picolinamide based palladium(II) complexes against P. aeruginosa and S. marcescens. Palladium(II) complexes showed quorum sensing inhibitory potential in inhibiting swarming motility behavior, pyocyanin production and other QS mediated virulence factors in both P. aeruginosa and S. marcescens. In addition, the establishment of biofilms was prevented on palladium (II) coated catheters. Overall, the present study demonstrates that thiazolinyl-picolinamide based palladium (II) complexes will be a promising strategy to combat device-mediated UTI infections.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

Recommanded Product: 15227-42-6. 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: cis-Dichlorobis(pyridine)platinum(II), is researched, Molecular C10H10Cl2N2Pt, CAS is 15227-42-6, about Activation of the trans geometry in platinum antitumor complexes: a survey of the cytotoxicity of trans complexes containing planar ligands in murine L1210 and human tumor panels and studies on their mechanism of action. Author is Farrell, Nicholas; Kelland, Lloyd R.; Roberts, John D.; Van Beusichem, Marijo.

The cytotoxicity of transplatinum complexes of structural formula trans-[PtCl2(L)L’)] {L = L’ = pyridine or thiazole, or L = quinoline (R’ = methyl; R” = Me, Ph or CH2phenyl) and L’ = R’R”SO] has been studied in murine L1210 and human tumor cell lines. The results confirm previous observations that use of a sterically hindered planar ligand greatly enhances cytotoxicity, in comparison to trans-[PtCl2(NH3)2], such that in some cases cytotoxicity equivalent to that of the clin. used agent cisplatin [cis-{PtCl2(NH3)2]] is obtained. Results from both the panel of human ovarian carcinoma cell lines and the National Cancer Institute screening panel confirm a different pattern of cytotoxicity, with respect to cisplatin. The new trans-platinum complexes are also non-cross-resistant with cisplatin in both murine and human (human ovarian carcinoma panel) tumor cell lines. Preliminary mechanistic studies using both cis- and trans-[PtCl2(pyridine)2] in L1210 cells have been carried out, to delineate the reasons for both the dramatically enhanced cytotoxicity and the lack of cross-resistance with the clin. used agents. Intracellular uptake is enhanced for pyridine relative to ammine (NH3) complexes. The pyridine complexes also inhibit DNA synthesis, implying a role for DNA binding in their mechanism of action. Binding of the pyridine complexes to calf thymus DNA is, however, significantly less than for the analogous ammine complexes. The presence of trans-pyridine ligands results in steric hindrance, which retards the rate of reaction of trans-[PtCl2(pyridine)2], relative to trans[PtCl2(NH3)2], with other important biomols. such as glutathione. The results point to a potential new class of platinum antitumor complexes acting by a new mechanism and with activity complementary to agents such as cisplatin.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

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, Journal of Organometallic Chemistry called Half-sandwich ruthenium(II) complexes containing biphenylamine based Schiff base ligands: Synthesis, structure and catalytic activity in amidation of various aldehydes, Author is Nagalakshmi, Veerasamy; Nandhini, Raja; Brindha, Veerappan; Krishnamoorthy, Bellie Sundaram; Balasubramani, Kasthuri, which mentions a compound: 1452-77-3, SMILESS is O=C(N)C1=NC=CC=C1, Molecular C6H6N2O, HPLC of Formula: 1452-77-3.

New half-sandwich ruthenium (II) complexes [(η6-p-cymene)Ru (L1-3)Cl] (1-3) containing biphenylamine based Schiff base ligands (HL1-3) have been synthesized and characterized by anal. and spectroscopic methods. Addnl., the solid state structure of 2 has been determined by single crystal X-ray diffraction study. The complex 2 serves as a catalyst for the amidation of various aldehydes to amides in good yield.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem

Quinodoz, Pierre; Wright, Karen; Drouillat, Bruno; Kletskii, Mikhail E.; Burov, Oleg N.; Lisovin, Anton. V.; Couty, Francois published the article 《α-Hydroxy-Tetrazoles as Latent Ethynyl Moieties: A Mechanistic Investigation》. Keywords: hydroxytetrazole dehydration Fritsch Buttenberg Wiechell; alkyne preparation.They researched the compound: 4-Chloro-4′-ethynyl-1,1′-biphenyl( cas:57399-11-8 ).Application In Synthesis of 4-Chloro-4′-ethynyl-1,1′-biphenyl. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:57399-11-8) here.

This article focuses on the dehydration of α-hydroxy-tetrazoles, leading to tetraazafulvenes and then to vinylic carbenes that rearrange into ethynyl moieties through the Fritsch-Buttenberg-Wiechell rearrangement. Each step of this sequence was scrutinized, either by examination of the substrate and/or dehydrating agent scope, or through AM1 calculations, to understand the limiting step of this process. This underrated transformation appears to be a viable alternative to existing methods used for transforming aldehydes into alkynes.

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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem