Month: December 2022

Cardenas, Mariel M. published the artcileEnantioselective Synthesis of Pyrrolopyrimidine Scaffolds through Cation-Directed Nucleophilic Aromatic Substitution, Related Products of chlorides-buliding-blocks, the publication is Organic Letters (2018), 20(7), 2037-2041, database is CAplus and MEDLINE.

The catalytic enantioselective synthesis of 3-aryl-substituted pyrrolopyrimidines (PPYs), a common motif in drug discovery, is achieved through a kinetic resolution via quaternary ammonium salt-catalyzed nucleophilic aromatic substitution (S_NAr). Both enantioenriched products and starting materials can be functionalized with no observed racemization to give enantiodivergent access to diverse chiral analogs of an important class of kinase inhibitor. One of the compounds was found to be a potent and selective inhibitor of breast tumor kinase.

Organic Letters published new progress about 145349-62-8. 145349-62-8 belongs to chlorides-buliding-blocks, auxiliary class Chloride,Boronic acid and ester,Benzene,Boronic Acids, name is 2-Chloro-4-methylphenylboronic acid, and the molecular formula is C7H8BClO2, Related Products of chlorides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Sanchez, Raquel published the artcileEffect of the silicon chemical form on the emission intensity in inductively coupled plasma atomic emission spectrometry for xylene matrices, COA of Formula: C7H16Cl2Si, the publication is Journal of Analytical Atomic Spectrometry (2009), 24(4), 391-401, database is CAplus.

Silicon is present in petrol products under very different chem. forms. The effect of the silicon chem. form on the sensitivity was studied by inductively coupled plasma at. emission spectrometry (ICP-AES). Solutions containing sixteen different silicon organic compounds with the same silicon concentration were prepared in xylene. The studied compounds were: six siloxanes, nine silanes and a silicate. Their b.ps. ranged from 101° (hexamethyldisiloxane) to 310° (2,3,4-(epoxycyclohexyl)ethyltrimetoxysilane). The ICP-AES signal depended strongly on the silicon compound Thus, for a commonly used sample introduction system consisting of a cross-flow pneumatic nebulizer coupled to a Ryton double pass spray chamber, the signal varied by a factor of up to 17, depending on the compound For most studied cases, some siloxanes yielded higher emission intensities than silanes. Under some circumstances, hexylmethyldichlorosilane and dimethyldodecylchlorosilane also produced higher signals than the other studied silanes. To elucidate the possible mechanisms for these changes, experiments were performed to verify whether the origin could be assigned either to the plasma or to the sample introduction system. Using the Mg II/Mg I ratio, no significant change in the plasma characteristics was actually observed As regards the sample introduction system, (i) the primary aerosol, (ii) the transport and memory effects using continuous and discrete introduction modes, an alternative spray chamber, and a total consumption system (the TISIS system), and (iii) the tertiary aerosol, via an impactor, were studied. Addnl. experiments were carried out with an ultrasonic nebulizer. The Si behavior was compared to other elements, such as Cu, Mg, Mn and Zn. The Si behavior was not related to the pneumatic nebulizer and suggested that a fraction of silicon was transported towards the plasma as a vapor when it was present as hexamethyldisiloxane (i.e., the compound with the lowest b.p. among the species studied). In any case, the variability of the signal induced by the different silicon chem. forms was less significant for the TISIS than for cyclonic and ultrasonic nebulizer. The observed results were specific to silicon as the signal of the other elements did not significantly change with silicon chem. form. As a consequence, internal standardization was not appropriate for mitigating interferences on silicon when petroleum products were analyzed.

Journal of Analytical Atomic Spectrometry published new progress about 14799-94-1. 14799-94-1 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is Dichloro(hexyl)(methyl)silane, and the molecular formula is C7H16Cl2Si, COA of Formula: C7H16Cl2Si.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Sanchez, Raquel published the artcileMinimization of the effect of silicon chemical form in xylene matrices on ICP-AES performance, Formula: C7H16Cl2Si, the publication is Journal of Analytical Atomic Spectrometry (2009), 24(10), 1382-1388, database is CAplus.

It was shown previously that the influence of the silicon chem. form could be minimized in ICP-AES by using high efficiency sample introduction systems. The effects of two of the most different silicon chem. forms were minimized in ICP-AES by using near total sample consumption systems. The two tested devices were a single pass spray chamber equipped with wall heating (heated torch integrated sample introduction system, h-TISIS) and a demountable direct injection high efficiency nebulizer (d-DIHEN). A room temperature TISIS and a cyclonic spray chamber were taken as the reference systems. Solutions containing silicon as six different compounds in xylene were prepared and analyzed through ICP-AES. At low liquid flow rates, the h-TISIS improves the sensitivity and the limits of detection as compared to the d-DIHEN. In contrast, shorter wash-out times were obtained for the d-DIHEN. As regards to the effect of the silicon chem. form, h-TISIS and d-DIHEN have minimized it with respect to a conventional cyclonic spray chamber.

Journal of Analytical Atomic Spectrometry published new progress about 14799-94-1. 14799-94-1 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is Dichloro(hexyl)(methyl)silane, and the molecular formula is C7H16Cl2Si, Formula: C7H16Cl2Si.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Ishizuka, Tomoya published the artcileProton-Coupled Electron Shuttling in a Covalently Linked Ruthenium-Copper Heterodinuclear Complex, Recommanded Product: 2-Chloroisonicotinic acid, the publication is Journal of the American Chemical Society (2011), 133(46), 18570-18573, database is CAplus and MEDLINE.

A heterodinuclear complex (I) based on a Ru^II-TPA [TPA = tris(2-pyridylmethyl)amine] complex having a peripheral Cu^II(bpy)₂ (bpy = 2,2′-bipyridine) group bonded through an amide linkage displayed reversible intramol. electron transfer between the Ru and Cu complex units that can be controlled by protonation and deprotonation of the bridging amide moiety.

Journal of the American Chemical Society published new progress about 6313-54-8. 6313-54-8 belongs to chlorides-buliding-blocks, auxiliary class Pyridine,Chloride,Carboxylic acid, name is 2-Chloroisonicotinic acid, and the molecular formula is C6H4ClNO2, Recommanded Product: 2-Chloroisonicotinic acid.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Gramstad, Thor published the artcileStudies of hydrogen bonding. Part XXVIII. Hydrogen bond association of phenol with 5,5-dimethyl-2-oxo-1,3,2-dioxaphosphorinanes and diethylphosphonates, SDS of cas: 866-23-9, the publication is Acta Chemica Scandinavica, Series B: Organic Chemistry and Biochemistry (1977), B31(5), 345-53, database is CAplus.

The association constant and enthalpy of formation of the equilibrium between phenol and twelve 5,5-dimethyl-2-oxo-1,3,2-dioxaphosphorinanes I (R = Cl, CCl3, OMe, Ph, NMe2, etc.) and six diethylphosphonates (EtO)2P(O)R1 (R1 = CCl3, SMe, CPh3, etc.) were determined The association constant, enthalpy of association, half band width, ν1/2, of the complexed O-H bond, P(O) bond moment, μPO, and excess charge d., Δq, on the phosphoryl O give linear relations with the O-H frequency shift, ΔνOH. The calculated P(O) bond moment in the axial and equatorial position gives a linear correlation with the exptl. P(O) stretching frequency. Furthermore, the square root of the addnl. dipole moment, Δμ1/2, due to H bond formation, correlates linearly with the association constant, the O-H frequency shift, and with the half band width. A close relationship between band width of the complexed O-H bond and the strength and polarity of the H bonded complex is deduced.

Acta Chemica Scandinavica, Series B: Organic Chemistry and Biochemistry published new progress about 866-23-9. 866-23-9 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is Diethyltrichloromethylphosphonate, and the molecular formula is C5H10Cl3O3P, SDS of cas: 866-23-9.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Peltenburg, Hester published the artcileSorption of structurally different ionized pharmaceutical and illicit drugs to a mixed-mode coated microsampler, Quality Control of 23616-79-7, the publication is Journal of Chromatography A (2016), 1-8, database is CAplus and MEDLINE.

The mixed-mode (C18/strong cation exchange-SCX) solid-phase microextraction (SPME) fiber has recently been shown to have increased sensitivity for ionic compounds compared to more conventional sampler coatings such as polyacrylate and polydimethylsiloxane (PDMS). However, data for structurally diverse compounds to this (prototype) sampler coating are too limited to define its structural limitations. The authors determined C18/SCX fiber partitioning coefficients of nineteen cationic structures without hydrogen bonding capacity besides the charged group, stretching over a wide hydrophobicity range (including amphetamine, amitriptyline, promazine, chlorpromazine, triflupromazine, difenzoquat), and eight basic pharmaceutical and illicit drugs (pKa >8.86) with addnl. hydrogen bonding moieties (MDMA, atenolol, alprenolol, metoprolol, morphine, nicotine, tramadol, verapamil). In addition, sorption data for three neutral benzodiazepines (diazepam, temazepam, and oxazepam) and the anionic NSAID diclofenac were collected to determine the efficiency to sample non-basic drugs. All tested compounds showed nonlinear isotherms above 1 mmol/L coating, and linear isotherms below 1 mmol/L. The affinity for C18/SCX-SPME for tested organic cations without H-bond capacities increased with longer alkyl chains, ranging from logarithmic fiber-water distribution coefficients (log D_fw) of 1.8 (benzylamine) to 5.8 (triflupromazine). Amines smaller than benzylamine may thus have limited detection levels, while cationic surfactants with alkyl chain lengths >12 carbon atoms may sorb too strong to the C18/SCX sampler which hampers calibration of the fiber-water relationship in the linear range. The log D_fw for these simple cation structures closely correlates with the octanol-water partition coefficient of the neutral form (K_ow,N), and decreases with increased branching and presence of multiple aromatic rings. Oxygen moieties in organic cations decreased the affinity for C18/SCX-SPME. Log D_fw values of neutral benzodiazepines were an order of magnitude higher than their log K_ow,N. Results for anionic diclofenac species (log K_ow,N 4.5, pKa 4.0, log D_fw 2.9) indicate that the C18-SCX fiber might also be useful for sampling of organic anions. This data supports the authors’ theory that C18-based coatings are able to sorb ionized compounds through adsorption and demonstrates the applicability of C18-based SPME in the measurement of freely dissolved concentrations of a wide range of ionizable compounds

Journal of Chromatography A published new progress about 23616-79-7. 23616-79-7 belongs to chlorides-buliding-blocks, auxiliary class Phase Transfer Catalyst, name is N-Benzyl-N,N-dibutylbutan-1-aminium chloride, and the molecular formula is C19H34ClN, Quality Control of 23616-79-7.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Saleh, Azhari published the artcileThe acid-catalyzed hydrolysis of episulfoxides, Safety of 1,2-Bis(2-chloroethyl)disulfane, the publication is Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999) (1981), 132-9, database is CAplus.

The acid-catalyzed hydrolyses of the episulfoxides I (R = H, Me, Ph, CHMe₂, CMe₃, Et) in aqueous mineral acids were studied kinetically. I (R = H, Me, Ph) was hydrolyzed by concurrent A-2 and nucleophile-catalyzed pathways. Hydrolysis of I (R = CHMe₂, CMe₃) in H₂SO₄ occurred by an A-2 mechanism, but in concentrated HClO₄ their rate profiles passed through a maximum with a changeover from an A-2 to an A-1 mechanism. The protonation behavior of these 2 episulfoxides was studied, pK_BH⁺ values being determined

Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999) published new progress about 1002-41-1. 1002-41-1 belongs to chlorides-buliding-blocks, auxiliary class Aliphatic Chain, name is 1,2-Bis(2-chloroethyl)disulfane, and the molecular formula is C4H8Cl2S2, Safety of 1,2-Bis(2-chloroethyl)disulfane.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Jia, Ruonan published the artcileSunlight-Driven Wearable and Robust Antibacterial Coatings with Water-Soluble Cellulose-Based Photosensitizers, Recommanded Product: 3-Carboxy-N,N,N-trimethylpropan-1-aminium chloride, the publication is Advanced Healthcare Materials (2019), 8(5), n/a, database is CAplus and MEDLINE.

Herein, a simple, effective, and general strategy is demonstrated to obtain a water-soluble and nontoxic cellulose-based photosensitizer (CPS) with enhanced photodynamic antibacterial activity through introducing protoporphyrin IX (PpIX) and quaternary ammonium salt (QAS) groups onto the cellulose backbone. The synergistic effect of the anchoring and diluting effect of the cellulose backbone and the electrostatic repulsion between QAS groups effectively inhibit the π-π stacking of PpIX groups, thus the as-prepared CPS exhibits markedly enhanced reactive oxygen species (ROS) yield. Meanwhile, the pos. charged QAS groups endow the CPS with water-solubility and a strong attractive force to bacteria. As a result, the CPS can rapidly and efficiently kill drug-resistant bacteria strains, including E. coli and S. aureus, with a low light dose (2.4 J cm-2) and low concentration of PpIX groups (0.35 × 10-6M). Benefiting from the excellent processability and formability, the CPS is readily applied as a sunlight-driven wearable and robust antibacterial coating by a spray coating and later crosslinking procedure.

Advanced Healthcare Materials published new progress about 6249-56-5. 6249-56-5 belongs to chlorides-buliding-blocks, auxiliary class Phase Transfer Catalyst,Inhibitor,Natural product, name is 3-Carboxy-N,N,N-trimethylpropan-1-aminium chloride, and the molecular formula is C7H16ClNO2, Recommanded Product: 3-Carboxy-N,N,N-trimethylpropan-1-aminium chloride.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Jiang, Xi published the artcileSynthesis and blue electroluminescent properties of copolymers derived from silafluorene and thiophene, Application of 4-Chloro-2-methylphenylboronic acid, the publication is Gaodeng Xuexiao Huaxue Xuebao (2007), 28(8), 1586-1592, database is CAplus.

Two series of silafluorene based copolymers containing a small molar fraction (1%-3%) of thiophene derivatives moieties were synthesized with Yamamoto coupling reaction: poly {9,9-dihexyl-3,6-silafluorene-co-[2,5-di(phenylene-4-yl)-thiophene]} (PSiF-DPT) and poly {9,9-dihexyl-3,6-silafluorene-co-[2,5-di-((2-methylphenylene)-4-yl)-thiophene]} (PSiF-DMPT). These copolymers were characterized via UV-Vis absorption spectra and photoluminescence spectra. Polymer light-emitting diodes (PLED) were fabricated to investigate these electroluminescent properties. It was found that the thiophene derivatives moieties became the efficient blue emitter via efficient energy transfer from the polysilafluorene segments. With the decrease of the coplanarity of thiophene derivatives or its feed ratio, the PL and EL spectra can be blue shifted. The color purity can be adjusted to CIE (0.19, 0.16) with a EL quantum efficiency of 0.46%.

Gaodeng Xuexiao Huaxue Xuebao published new progress about 209919-30-2. 209919-30-2 belongs to chlorides-buliding-blocks, auxiliary class Chloride,Boronic acid and ester,Benzene,Boronic Acids,Boronic acid and ester, name is 4-Chloro-2-methylphenylboronic acid, and the molecular formula is C7H8BClO2, Application of 4-Chloro-2-methylphenylboronic acid.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics

Xu, Rong published the artcilePeptide-cross-linked protein-imprinted polymers: easy template removal and excellent imprinting effect, Quality Control of 42074-68-0, the publication is CCS Chemistry (2019), 1(5), 544-552, database is CAplus.

Mol. imprinting of proteins remains a huge challenge because of two major obstacles: difficulty in template removal and low imprinting efficiency. Herein, we propose a new strategy to simultaneously overcome these two challenges by creating molecularly imprinted polymers (MIPs) with nanoscale shape-memorable imprint cavities. These novel MIPs were developed by simply crosslinking the polymers with a peptide cross-linker instead of commonly used cross-linkers. Due to the unique pH-induced helix- coil transition of the peptide cross-linker, adjusting the pH from 5.5 to 7.4 leads to an expansion of the imprint cavities, thus facilitating template removal. Returning the pH back to 5.5 restores the original size and shape of the imprint cavities due to the precise refolding of peptide. A template protein can therefore be readily removed under mild conditions, while simultaneously achieving a significantly improved imprinting effect.

CCS Chemistry published new progress about 42074-68-0. 42074-68-0 belongs to chlorides-buliding-blocks, auxiliary class Chloride,Benzyl chloride,Benzene, name is 2-Chlorotrityl chloride, and the molecular formula is C7H3IN2O2, Quality Control of 42074-68-0.

Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics