Tag: M.W=200-250

Boisaubert, Pierre published the artcilePhoto-crosslinked Non-Isocyanate Polyurethane Acrylate (NIPUA) coatings through a transurethane polycondensation approach, Quality Control of 1761-71-3, the publication is Polymer (2020), 122855, database is CAplus.

A transurethane polycondensation pathway was used to produce acrylate terminated non-isocyanate polyurethane (NIPUA) oligomers (A-Ol) with controlled mol. weights and chem. structures. These compounds were then photocrosslinked under UV radiations to afford several NIPU acrylate coatings. The influence of the content in urethane functions as well as the chem. structures on the thermal and mech. properties of the final coatings was demonstrated. The obtained coatings exhibited thermal stabilities above 255°C, Young modulus ranging from 2.6 to 9.2 MPa, tensile strength up to 11.8 MPa and elongation at break varying from 20 to 520%.

Polymer published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Quality Control of 1761-71-3.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Doering, W. v. E. published the artcileSynthesis of substituted tropolones, SDS of cas: 20029-52-1, the publication is Journal of the American Chemical Society (1953), 297-303, database is CAplus.

By photochem. decomposition of CH₂N₂ (I) in a substituted benzene (Ia) and oxidation of the resulting tropilidene (II) with KMnO₄, β- (III) and γ- iso-Pr-(IV), β- (V) and γ-cyclohexyl- (VI), 4,5-tetramethylene- (VII), and β- (VIII) and γ-phenyltropolone (IX) were prepared and assigned structures partly on the basis of rearrangement to the related benzoic acids. II were prepared by adding 105 g. nitrosomethylurea (X) in small portions with vigorous stirring at 0° to a mixture of 2-2.5 l. of Ia and 210 mL. 45% KOH, decanting the organic solution, drying 2 h. at 0° over KOH, irradiating with G. E. reflector sunlamps until N evolution ceased (18-42 h.), and distilling the Ia through a 17-plate column. Recovered Ia was recycled; the residues from several runs were combined and distilled through a 35-plate column to give crude II. Equimolar amounts of II and maleic anhydride refluxed 15-24 h. in 5-40 mL. dry C₆H₆ gave the following adducts (XI). The following II [R, yield (% based on X), b.p., n²⁵_D, m.p. and crude yield (%) of the XI] were prepared: iso-Pr (XII), 16.5, 172-5°, 1.4932-1.5020, 115-16°, 17; cyclohexyl (XIII), 13.3, 125.5-8° (20 mm.), 1.5245-1.5300, 201-2°, 11.3; and Ph (XIV), 8.9, 114-16° (6 mm.), 1.6164-1.6213, 131-2°, 22; also 1,2-tetramethylenetropilidene (XV), 20.0, 105-8° (27 mm.), 1.5525-1.5458, 124-5°, 11. II were oxidized by cooling 0.1 mol in 1.4 l. 95% EtOH and 60 mL. 45% KOH to -10° and adding 31.2 g. KMnO₄ in 1.4 l. H₂O over a period of 2-2.5 h. with cooling to -5°. The MnO₂ was filtered, washed with 1 l. hot H₂O, the filtrate added to the washings from which EtOH had been distilled, the solution extracted with CHCl₃, acidified with 6N H₂SO₄, extracted with CHCl₃, and the tropolone (XVI) in this extract converted to the Cu salt (XVII) with saturated aqueous Cu(OAc)₂; the CHCl₃ solutions (XVIII) of XVII obtained by repeated extraction with warm CHCl₃ were concentrated and treated as described for the individual XVI. XVIII from 13.4 g. XII concentrated to 5 mL. and cooled gave 1.22 g. XVII, m. 92-4° after crystallization from CHCl₃ (0.76 g. recovered) (from the mother liquors another 0.229 g., m. 89-91°, was obtained). A CHCl₃ solution of this treated with H₂S (cf. C.A. 46, 487f) gave 0.372 g. crude III, m. 51-2° after sublimation at 60-70° (4 mm.) and crystallization from isohexane (p-nitrobenzoate, m. 119°; α,α’-dibromo derivative, m. 132-3°); material from the second crop of XVII and mother liquors raised the yield to 2.9%. III (0.328 g.), 8 mL. dry C₆H₆, and 0.3 mL. SOCl₂ refluxed until a drop gave no color with alc. FeCl₃, concentrated, and distilled twice at 95-100° (2 mm.) gave 50% 2-chloro-4(or 6)-isopropyltropone, alk. rearrangement of which [cf. D. and K., J. Am. Chem. Soc. 74, 5683(1952)] gave 38% 3-iso-PrC₆H₄CO₂H. IV, obtained in 1.3% yield from the mother liquors from crystallization of the XVII of III, m. 80-1° [p-nitrobenzoate, m. 135°; α,α’-diBr derivative (α,α’-dibromo-γ-thujaplicin), m. 146°]; hydrogenation in 95% EtOH over PtO₂ gave 60% 5-isopropyl-1,2-cycloheptanediol, m.85-6°; treatment with SOCl₂ as for III gave 40% 2-chloro-5-isopropyltropone, which rearranged with alkali to give 17% p-iso-PrC₆H₄CO₂H. The mixed XVII of V and VI, m. 168-71° (4% yield) did not sep. on crystallization from CHCl₃; the oil obtained by H₂S treatment, sublimed at 80-90° (2 mm.) and the sublimate crystallized rapidly gave VI, m. 97-8° (p-nitrobenzoate, m. 160-1°); hydrogenation of this gave 5-cyclohexyl-1,2-cycloheptanediol, m. 123-5°; the Me ether (from VI and CH₂N₂) heated 12 h. at 120° in a sealed tube with 4 mL. absolute MeOH and 0.05 g. NaOMe gave p-cyclohexylbenzoic acid, m. 197-8°. V, m. 88-9° (p-nitrobenzoate, m. 139-40°), was recovered from the mother liquor from VI; hydrogenation gave 4-cyclohexyl-1,2-cycloheptanediol (colorless glass); the Me ether (from V and CH₂N₂) rearranged to m-cyclohexylbenzoic acid, m. 197-8°. Yields of VI and V were raised to 0.21 and 0.13% resp., based on X, by working up the mother liquors. Procedures like those above gave the following XVI [with XVI, m.p., yield (% based on X), p-nitrobenzoate m.p., XVII m.p., hydrogenation product and its m.p., Me ether m.p., Me ether rearrangement product, and its m.p. given]: VII, 130°, 0.62, 149-50.5°, 287-8°, 4,5-tetramethylene-1,2-cycloheptanediol, 74-5°, 59-65° (mixture of isomeric ethers), 5,6,7,8-tetrahydro-2-naphthoic acid, 153-4° (amide, m. 136-8°); VIII, 97°, 0.18, 144-5°, -, 4-phenyl-1,2-cycloheptanediol, 107-9°, Me ether not prepared (rearrangement of 2-chloro-4-phenyltropone, from VIII and SOCl₂, gave diphenyl-3-carboxylic acid, m. 165-6°); IX, 125-6°, 0.09, 220-1°, 342-5° (decomposition), 5-phenyl-1,2-cycloheptanediol, 97-8°, 141° (Me ether not rearranged; rearrangement of 2-chloro-5-phenyltropone, m. 158°, from IX and SOCl₂, gave diphenyl-4-carboxylic acid, m. 223-4°). UV absorption spectra of XVI are given.

Journal of the American Chemical Society published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C13H16O2, SDS of cas: 20029-52-1.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Voronenkov, V. V. published the artcileSynthesis of p-alkylbenzoic acids by one-electron oxidation of p-alkyltoluenes. MINDO/3 calculations of p-alkyltoluenes and their radical cations, Application In Synthesis of 20029-52-1, the publication is Zhurnal Organicheskoi Khimii (1989), 25(12), 2565-9, database is CAplus.

The role of σ,π-conjugation in determining the regiochem. of one-electron oxidation of the title compounds, i.e., p-MeC₆H₄CHMe₂, was investigated by MINDO/3 mol.-structure calculation The isopropyl-group C-H bond was in the plane of the aromatic ring, a conformation preventing its participation in σ,π-conjugation; two of the Me-group C-H bonds were perpendicular to the aromatic plane, however, suggesting their participation in σ,π-conjugation could significantly enhance their acidity and deprotonation affinity. Analogous results were obtained for p-cyclopropyltoluene.

Zhurnal Organicheskoi Khimii published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C5H11NO2S, Application In Synthesis of 20029-52-1.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Koshel’, G. N. published the artcileLiquid-phase catalytic oxidation of methyl derivatives of biphenyl, Quality Control of 20029-52-1, the publication is Kinetics and Catalysis (2004), 45(6), 821-825, database is CAplus.

Liquid-phase catalytic oxidation into acids by air was studied for the following hydrocarbons: isomers of cyclohexyltoluenes and cyclohexyl derivatives of para-xylene, mesitylene, pseudocumene, cyclopentyltoluene, cyclohexyladamantane, 4-methylbiphenyl, 2,4-, 2,5- and 3,4-dimethylbiphenyls, hydroxymethylbiphenyls, and hydroxymethylbenzenes. The oxidation of cyclohexyltoluenes involves a Me group and proceeds without participation of the α-CH bond of the cyclohexyl fragment in the oxidative conversions. The reactivity of the hydrocarbons increases in the order ortho < meta < para. Consecutive conversions of the Me groups to carboxyls occur during the oxidation of dimethylbiphenyls. In 3,4- and 2,5-dimethylbiphenyls, the Me groups in the para and ortho positions, resp., are first oxidized, whereas the reactivity of both of the Me groups in 2,4-dimethylbiphenyl is virtually the same. The mechanism of the oxidation of hydroxymethylbiphenyls and hydroxymethylbenzenes involves the formation of an unstable cation radical, which is then stabilized by emitting a proton, giving hydroxybenzyl, a more stable radical.

Kinetics and Catalysis published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C13H16O2, Quality Control of 20029-52-1.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Berne, Sabina published the artcileBenzoic acid derivatives with improved antifungal activity: design, synthesis, structure-activity relationship (SAR) and CYP53 docking studies, Quality Control of 20029-52-1, the publication is Bioorganic & Medicinal Chemistry (2015), 23(15), 4264-4276, database is CAplus and MEDLINE.

Previously, the authors identified CYP53 as a fungal-specific target of natural phenolic antifungal compounds and discovered several inhibitors with antifungal properties. In this study, they performed similarity-based virtual screening and synthesis to obtain benzoic acid-derived compounds and assessed their antifungal activity against Cochliobolus lunatus, Aspergillus niger and Pleurotus ostreatus. In addition, the authors generated structural models of CYP53 enzyme and used them in docking trials with 40 selected compounds Finally, they explored CYP53-ligand interactions and identified structural elements conferring increased antifungal activity to facilitate the development of potential new antifungal agents that specifically target CYP53 enzymes of animal and plant pathogenic fungi.

Bioorganic & Medicinal Chemistry published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C13H16O2, Quality Control of 20029-52-1.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Wortmann, Martin published the artcileEffect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting, Recommanded Product: 4,4-Diaminodicyclohexyl methane, the publication is ACS Omega (2021), 6(7), 4687-4695, database is CAplus and MEDLINE.

Polyurethane vacuum casting with silicone molds is a widely used industrial process for the production of prototypes and small batches. Since the silicone casting molds absorb the isocyanate component of the curing PUR casting resin at the cavity surface, the service life of the molds is typically restricted to very few casting cycles. The successive deterioration of the material properties results from the polymerization of the absorbed isocyanate with moisture to polyurea derivatives within the silicone matrix. In this study, we show for the first time the influence of isocyanate absorption on the mech. properties of silicone elastomers as well as quant. differences between com. materials. The changes in mech. properties were quantified in terms of Shore A hardness, Young’s modulus, tensile strength, elongation at break, and complex shear modulus. It was found that the influence of the isocyanate type on the relative property changes of the silicone was significantly greater than that of the silicone used. The results show that, regardless of its hardness, the silicone absorbs considerably less methylene di-Ph diisocyanate (MDI) than hydrogenated MDI, although the latter causes less deterioration of the mech. properties and achieves a longer mold service life.

ACS Omega published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C65H82N2O18S2, Recommanded Product: 4,4-Diaminodicyclohexyl methane.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Haque, Bazle Z. published the artcileDepth of penetration experiments of S-2 glass/epoxy composites: A new experimental methodology in determining the rate dependent dynamic crush strength of composites, Recommanded Product: 4,4-Diaminodicyclohexyl methane, the publication is Composites, Part B: Engineering (2022), 109917, database is CAplus.

Depth of penetration (DoP) experiments have been conducted on thick section S-2 glass/epoxy laminates impacted by 64 grain steel projectiles over an impact velocity range of 400 m/s to 1400 m/s. Under high velocity impact, the composite under the projectile is highly compressed and crushes into powder. A theor. model is developed to reduce DoP data that relates the plastic/granular wave velocity, plastic/granular strain and strain rate during penetration to the strain rate dependent dynamic punch crush strength and plastic/granular erosion strain of composite for the first time in the literature. Punch crush strength is an important material property used in rate dependent progressive composite damage models. DoP experiments on thick section composites are presented to study the effects of fiber volume fraction, fabric architecture, and inelastic matrix behavior on depth of penetration and damage modes. The new data reduction methodol. is used to calculate the rate dependent punch crush strength of glass/epoxy laminates.

Composites, Part B: Engineering published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Recommanded Product: 4,4-Diaminodicyclohexyl methane.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Fredenhagen, Andreas published the artcileEvaluation of the optimization space for atmospheric pressure photoionization (APPI) in comparison with APCI, COA of Formula: C13H16O2, the publication is Journal of Mass Spectrometry (2014), 49(8), 727-736, database is CAplus and MEDLINE.

The usefulness of atm. pressure photoionization (APPI) is difficult to evaluate for unknowns due to the fragmented literature. Specifically, the variation of dopants with a wide set of compounds or the use of APPI in the neg. mode have rarely been explored. Thirty compounds were selected that were not suitable for ESI with a wide variety of functional groups and investigated with atm. pressure chem. ionization (APCI) and APPI in the pos. and neg. ion modes. The influence of the mobile phase (eluents containing acetonitrile or methanol) and – for APPI – four different dopants (acetone, chlorobenzene, toluene, and toluene/anisole) were explored. Stepwise variation of the organic mobile phase allowed to elucidate the ionization mechanism. Atm. pressure photoionization was especially useful for compounds, where the M^•+ and not the [M + H]⁺ was formed. The dopants chlorobenzene and anisole promoted the formation of mol. ions M^•+ for about half of the compounds, and its formation was also pos. influenced by the use of mobile phases containing methanol. In the neg. ion mode, APPI offered no advantage toward APCI. Best results were generally achieved with the dopant chlorobenzene, establishing that this dopant is suitable for a wide set of compounds For one quarter of the compounds, significantly better results were achieved with mobile phases containing methanol for both APPI and APCI than those with acetonitrile, but only in the pos. mode. With either of the methods – APPI or APCI – about 10% of the compounds were not detected. Strategies to get results quickly with difficult unknowns will be discussed.

Journal of Mass Spectrometry published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C13H16O2, COA of Formula: C13H16O2.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Rumyantseva, Yu. B. published the artcileIntensification of oxidation of cyclohexyltoluene to hydroperoxide, Computed Properties of 20029-52-1, the publication is Izvestiya Vysshikh Uchebnykh Zavedenii, Khimiya i Khimicheskaya Tekhnologiya (2011), 54(10), 102-104, database is CAplus.

Liquid phase oxidation of cyclohexyltoluene to hydroperoxide was studied in the presence of initiator – isopropylbenzene hydroperoxide and nitrogen-containing catalysts. The oxidation rate of cyclohexyltoluene increases 2.5-3 times at the presence of N-hydroxyphthalimide at 110-140°. The hydrocarbon conversion is up to 28-30% and the selectivity of cyclohexyltoluene hydroperoxide I formation is 93-95%.

Izvestiya Vysshikh Uchebnykh Zavedenii, Khimiya i Khimicheskaya Tekhnologiya published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C13H16O2, Computed Properties of 20029-52-1.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Hu, Fengshuo published the artcileEpoxidized soybean oil modified using fatty acids as tougheners for thermosetting epoxy resins: Part 2-Effect of curing agent and epoxy molecular weight, Safety of 4,4-Diaminodicyclohexyl methane, the publication is Journal of Applied Polymer Science (2021), 138(24), 50579, database is CAplus.

A series of bio-rubber (BR) tougheners for thermosetting epoxy resins was prepared by grafting renewable fatty acids with different chain lengths onto epoxidized soybean oil at varying molar ratios. BR-toughened samples were prepared by blending BRs with diglycidyl ether of bisphenol A resins, Epon 828 and Epon 1001F, at different weight fractions and stoichiometrically cured using an amine curing agent, 4, 4′-methylene biscyclohexanamine (PACM). Fracture toughness properties of the unmodified and BR toughened polymer samples-including critical strain energy release rate (G_Ic), and critical stress intensity factor (K_Ic)-were measured to investigate the toughening effect of prepared BRs. It was found that the degree of phase separation and toughening were more controllable relative to similar polymers cured using the aromatic curing agent Epikure W, and the use of higher mol. epoxy resins produces a synergistic effect increasing the toughness much more than similar polymers made with lower mol. weight epoxy resins. Average BR domain sizes ranging from 200 to 900 nm were observed, and formulations with G_Ic, values K_Ic as high as 1.0 kJ/m² and 1.4 MPa m^1/2 were attained resp. for epoxy systems with T_g greater than 130°C.

Journal of Applied Polymer Science published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Safety of 4,4-Diaminodicyclohexyl methane.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider