Tag: M.W=200-250

Zhang, Xiaoyi published the artcileNovel fluorescent columnar liquid crystal based on tetraphenylethylene-rufigallol-tetraphenylethylene triads, COA of Formula: C12H25Br, the publication is Journal of Molecular Structure (2022), 132210, database is CAplus.

Two new tetraphenylethylene- rufigallol-tetraphenylethylene triads 7a and 7b were synthesized in yield of 50%. These compounds were characterized by mass spectrometry, NMR spectroscopy, and elemental anal. Their mesomorphic behaviors were studied by polarization microscopy, DSC, and x-ray diffractometry. Study of their liquid crystalline behaviors indicated that 7a and 7b possessed the hexagonal columnar mesophase. 7b with dodecyl chains exhibited the low phase transition temperatures and wide range of mesophase temperatures in comparison with 7a. 7a and 7b exhibited excellent aggregation-induced emission in H₂O/THF solution The fluorescence quantum yields of these compounds in the solid state were 22 and 16%, resp. Results from this study suggest that sym. trimer was a good approach to construct novel fluorescence columnar liquid crystals.

Journal of Molecular Structure published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C65H82N2O18S2, COA of Formula: C12H25Br.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Li, Xiang published the artcileCatalytic remote hydrohalogenation of internal alkenes, Quality Control of 143-15-7, the publication is Nature Chemistry (2022), 14(4), 425-432, database is CAplus and MEDLINE.

Abstract: Primary alkyl halides have broad utility as fine chems. in organic synthesis. The direct halogenation of alkenes is one of the most efficient approaches for the synthesis of these halides. Internal alkenes, in particular mixtures of isomers from refineries, constitute readily available and inexpensive feedstock and are the most attractive starting materials for this synthesis. However, the hydrohalogenation of alkenes generally affords branched alkyl halides; there are no catalytic methods to prepare linear alkyl halides directly from internal alkenes, let alone from a mixture of alkene isomers. Here a report the remote oxidative halogenation of alkenes under palladium catalysis via which both terminal and internal alkenes yield primary alkyl halides efficiently. Engineering pyridine-oxazoline ligands by introducing a hydroxyl group is essential for achieving excellent chemo- and regioselectivity. The catalytic system is also good for the mixture of alkene isomers generated from dehydrogenation of alkanes, providing a window to investigate the high-value utilization of inexpensive alkanes.

Nature Chemistry published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Quality Control of 143-15-7.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Sweeting, Orville J. published the artcile1,3-Dienes. II. Stereoisomerism of bromides and glycols derived from 2,3-dimethyl-1,3-butadiene, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane, the publication is Journal of the American Chemical Society (1946), 1057-61, database is CAplus.

cf. C.A. 35, 1377.4. (MeC:CH₂)₂ (I) (41 g.) in 200 mL. CHCl₃ at -10°, treated with 80 g. Br in 150 mL. CHCl₃ during 5 h., gives 87% of the trans-1,4-dibromide (II), b₅ 88.5-91.5°, m. 47-7.5°, and small quantities of the cis-isomer (III), b₅ 77.5-9.5°, d₄²⁵ 1.6695, n_D²⁵ 1.5558, n_D⁵⁰ 1.5420, and of the 1,2,3,4-tetrabromide (IV), m. 138.5-9°. I (76 g.) in 200 mL. petr. ether at -5°, treated with 148 g. Br at such a rate that the temperature remained below 0° (7 h.), gives 25.5 g. of IV, 75% of II, and 4% of III. When the reaction of I and Br in CHCl₃ is illuminated with UV light (temperature not above 30°) there result 10% of II and 46% of III; without illumination, 80% of II was formed. Ozonolysis of III gives 75% of BrCH₂Ac; no HCHO was found. II (25 g.), heated under reduced pressure at 120° for 15 h., gives 11.1 g. of III. II (65 g.) and 60 g. AcOK in 550 mL. absolute EtOH, refluxed 10 h., give 67% of trans-1,4-diacetoxy-2,3-dimethyl-2-butene (V), m. 38.5-9°; similarly, III gives 75% of the cis-isomer (VI) of V, b₇ 108-11°, b₂₈ 138-44°. V (5 g.) in 100 mL. CCl₄, treated with 4 g. Br at -10°, gives 17% of the 2,3-di-Br derivative, b₇ 70-2°, which rapidly becomes green and then black; the same compound appears to be formed from VI, and also by stirring 15 g. of IV and 25 g. AcOAg in AcOH for 14 h. IV does not react with AcOK. V (10 g.) and 31.5 g. Ba(OH)₂ in 50 mL. EtOH, refluxed and stirred for 5 h., give 46% of trans-2,3-dimethyl-2-butene-1,4-diol (VII), m. 57-8° (bisphenylurethane, m. 157-7.5°); the cis-isomer (VIII), b₅ 110-15° (bisphenylurethane, m. 147-8°). Pinacol and aqueous HBr give 2,3-dibromo-2,3-dimethylbutane, m. 177-7.5° (sealed tube). The following values for μ × 10¹⁸ are given: II 1.72, III 2.49, IV 1.55, V 1.90, VI 2.58, VII 1.93, VIII 2.52, and trans-1,4-dibromo-2-butene 1.63. The phys. and chem. evidence affords reasonable grounds for assigning the trans-configuration to II, V, and VII. All the evidence is consistent with the view that III is the cis-isomer and that VI and VIII are largely, if not entirely, the cis-isomers.

Journal of the American Chemical Society published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C17H37NO3, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Inam, Maria published the artcileControlling the Size of Two-Dimensional Polymer Platelets for Water-in-Water Emulsifiers, Recommanded Product: Sodium 3-bromopropane-1-sulfonate, the publication is ACS Central Science (2018), 4(1), 63-70, database is CAplus and MEDLINE.

A wide range of biorelevant applications, particularly in pharmaceutical formulations and the food and cosmetic industries, require the stabilization of two water-soluble blended components which would otherwise form incompatible biphasic mixtures Such water-in-water emulsions can be achieved using Pickering stabilization, where two-dimensional (2D) nanomaterials are particularly effective due to their high surface area. However, control over the shape and size of the 2D nanomaterials is challenging, where it has not yet been possible to examine chem. identical nanostructures with the same thickness but different surface areas to probe the size-effect on emulsion stabilization ability. Hence, the rationale design and realization of the full potential of Pickering water-in-water emulsion stabilization have not yet been achieved. Herein, we report for the first time 2D poly(lactide) platelets with tunable sizes (with varying coronal chem.) and of uniform shape using a crystallization-driven self-assembly methodol. We have used this series of nanostructures to explore the effect of 2D platelet size and chem. on the stabilization of a water-in-water emulsion of a poly(ethylene glycol) (PEG)/dextran mixture We have demonstrated that cationic, zwitterionic, and neutral large platelets (ca. 3.7 × 10⁶ nm²) all attain smaller droplet sizes and more stable emulsions than their resp. smaller platelets (ca. 1.2 × 10⁵ nm²). This series of 2D platelets of controlled dimensions provides an excellent exemplar system for the investigation of the effect of just the surface area on the potential effectiveness in a particular application.

ACS Central Science published new progress about 55788-44-8. 55788-44-8 belongs to bromides-buliding-blocks, auxiliary class Bromide,Salt,Aliphatic hydrocarbon chain,Aliphatic hydrocarbon chain, name is Sodium 3-bromopropane-1-sulfonate, and the molecular formula is C3H6BrNaO3S, Recommanded Product: Sodium 3-bromopropane-1-sulfonate.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Dobbs, Adrian P. published the artcileIndole radical cyclizations: a rapid route to mitosenes, Safety of (4-Bromobut-1-yn-1-yl)trimethylsilane, the publication is Tetrahedron Letters (1995), 36(27), 4857-60, database is CAplus.

The syntheses and radical cyclization of 2-bromoindoles carrying an unsaturated N-alkyl group is described. The radical cyclization of 1-(3-butenyl)-2-bromo-1H-indole gave 2,3-dihydro-1-methyl-1H-pyrrolo[1,2-a]indole (79% yield). The cyclization of 2-bromo-1-(4-pentenyl)-1H-indole gave 6,7,8,9-tetrahydro-9-methylpyrido[1,2-a]indole (74% yield).

Tetrahedron Letters published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, Safety of (4-Bromobut-1-yn-1-yl)trimethylsilane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Ellis, Gwynn P. published the artcileOne-step synthesis and spectral study of 1-methylbenzimidazoles including use of a lanthanide shift reagent, Name: 4-Bromo-N-methyl-2-nitroaniline, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1974), 903-9, database is CAplus.

4-Substituted 1,2-phenylenediamines and their N-1-Ac derivatives with HCHO in boiling EtOH containing HCl gave 5- and 6-substituted 1-methylbenzimidazoles. E.g., 1,2-(H2N)2C6H3R-4 (R = NO2, Cl) gave 42% 6-nitro- and 43% 5-chloro-1-methyl-benzimidazole. Other 4-substituted 1,2-phenylenediamines gave mixtures The preparation of 5- and 6-substituted 1-methylbenzimid-azoles by other routes and the differentiation of isomeric pairs by lanthanide shift NMR spectroscopy is described.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 53484-26-7. 53484-26-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Nitro Compound,Amine,Benzene, name is 4-Bromo-N-methyl-2-nitroaniline, and the molecular formula is C7H7BrN2O2, Name: 4-Bromo-N-methyl-2-nitroaniline.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Saraswathi, Sajena K. published the artcileThymine-Induced Dynamic Switching of Self-Assembled Nanofibers in Diaminotriazine-Functionalized Tetraphenylethylene Derivatives: Implications for One-Dimensional Molecular Devices, Quality Control of 143-15-7, the publication is ACS Applied Nano Materials (2022), 5(2), 3018-3027, database is CAplus.

One-dimensional (1D) supramol. polymers of aggregation-induced emission (AIE)-active chromophores belong to an in-demand group of functional materials because of their potential applications in optoelectronic devices like optical waveguides, lasers, displays, photodetectors, field-effect transistors, and solar cells. Herein, we report the hydrogen (H)-bondingdirected self-assembly of diaminotriazine-appended tetraphenylethylene derivatives (TPE-DAT) into 1D-fibers, hierarchical organogels and their thymine-induced structural transitions. The intermol. H-bonding ability of diaminotriazine (-DAT=DAT-) leads to the formation of TPE dimers, which upon subsequent cooperative self-assembly via π-π stacking forms micrometer-long, blue-emissive, bundled nanofibers. Further, we exploit the mol. recognition property of thymine nucleobase toward the diaminotriazine unit to tune the properties of this 1D assembly. In the presence of a thymine derivative (T-C12), the blue-emissive, bundled nanofibers of TPE-DAT having a width of 70-80 nm changes to green-emissive nanofibers of TPE-DATT-C12 with 30-40 nm width. This transition from blue- to green-emissive nanofibers and hierarchical gels was ascribed to the change in monomeric units, their mol. planarity, and packing in the self-assembly, which was further probed by UV-visible absorption, at. force microscopy (AFM), transmission electron microscopy (TEM), and fluorescence properties. In addition, to gain more insights into the mechanism of these 1D-assemblies, we explored the self-assembly properties of chiral and racemic derivatives of TPE-DAT and the gelation properties of TPE-DAT and TPE-DATT-C12. In short, this work demonstrates the use of the mol. recognition property of nucleobase and nucleobase analogs in constructing and controlling the formation of rarely reported 1D-assemblies of AIE-active TPE chromophores.

ACS Applied Nano Materials published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Quality Control of 143-15-7.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Zhang, Xiaoyi published the artcileNovel fluorescent columnar liquid crystal based on tetraphenylethylene-rufigallol-tetraphenylethylene triads, COA of Formula: C12H25Br, the publication is Journal of Molecular Structure (2022), 132210, database is CAplus.

Two new tetraphenylethylene- rufigallol-tetraphenylethylene triads 7a and 7b were synthesized in yield of 50%. These compounds were characterized by mass spectrometry, NMR spectroscopy, and elemental anal. Their mesomorphic behaviors were studied by polarization microscopy, DSC, and x-ray diffractometry. Study of their liquid crystalline behaviors indicated that 7a and 7b possessed the hexagonal columnar mesophase. 7b with dodecyl chains exhibited the low phase transition temperatures and wide range of mesophase temperatures in comparison with 7a. 7a and 7b exhibited excellent aggregation-induced emission in H₂O/THF solution The fluorescence quantum yields of these compounds in the solid state were 22 and 16%, resp. Results from this study suggest that sym. trimer was a good approach to construct novel fluorescence columnar liquid crystals.

Journal of Molecular Structure published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C65H82N2O18S2, COA of Formula: C12H25Br.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Li, Xiang published the artcileCatalytic remote hydrohalogenation of internal alkenes, Quality Control of 143-15-7, the publication is Nature Chemistry (2022), 14(4), 425-432, database is CAplus and MEDLINE.

Abstract: Primary alkyl halides have broad utility as fine chems. in organic synthesis. The direct halogenation of alkenes is one of the most efficient approaches for the synthesis of these halides. Internal alkenes, in particular mixtures of isomers from refineries, constitute readily available and inexpensive feedstock and are the most attractive starting materials for this synthesis. However, the hydrohalogenation of alkenes generally affords branched alkyl halides; there are no catalytic methods to prepare linear alkyl halides directly from internal alkenes, let alone from a mixture of alkene isomers. Here a report the remote oxidative halogenation of alkenes under palladium catalysis via which both terminal and internal alkenes yield primary alkyl halides efficiently. Engineering pyridine-oxazoline ligands by introducing a hydroxyl group is essential for achieving excellent chemo- and regioselectivity. The catalytic system is also good for the mixture of alkene isomers generated from dehydrogenation of alkanes, providing a window to investigate the high-value utilization of inexpensive alkanes.

Nature Chemistry published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Quality Control of 143-15-7.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Sweeting, Orville J. published the artcile1,3-Dienes. II. Stereoisomerism of bromides and glycols derived from 2,3-dimethyl-1,3-butadiene, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane, the publication is Journal of the American Chemical Society (1946), 1057-61, database is CAplus.

cf. C.A. 35, 1377.4. (MeC:CH₂)₂ (I) (41 g.) in 200 mL. CHCl₃ at -10°, treated with 80 g. Br in 150 mL. CHCl₃ during 5 h., gives 87% of the trans-1,4-dibromide (II), b₅ 88.5-91.5°, m. 47-7.5°, and small quantities of the cis-isomer (III), b₅ 77.5-9.5°, d₄²⁵ 1.6695, n_D²⁵ 1.5558, n_D⁵⁰ 1.5420, and of the 1,2,3,4-tetrabromide (IV), m. 138.5-9°. I (76 g.) in 200 mL. petr. ether at -5°, treated with 148 g. Br at such a rate that the temperature remained below 0° (7 h.), gives 25.5 g. of IV, 75% of II, and 4% of III. When the reaction of I and Br in CHCl₃ is illuminated with UV light (temperature not above 30°) there result 10% of II and 46% of III; without illumination, 80% of II was formed. Ozonolysis of III gives 75% of BrCH₂Ac; no HCHO was found. II (25 g.), heated under reduced pressure at 120° for 15 h., gives 11.1 g. of III. II (65 g.) and 60 g. AcOK in 550 mL. absolute EtOH, refluxed 10 h., give 67% of trans-1,4-diacetoxy-2,3-dimethyl-2-butene (V), m. 38.5-9°; similarly, III gives 75% of the cis-isomer (VI) of V, b₇ 108-11°, b₂₈ 138-44°. V (5 g.) in 100 mL. CCl₄, treated with 4 g. Br at -10°, gives 17% of the 2,3-di-Br derivative, b₇ 70-2°, which rapidly becomes green and then black; the same compound appears to be formed from VI, and also by stirring 15 g. of IV and 25 g. AcOAg in AcOH for 14 h. IV does not react with AcOK. V (10 g.) and 31.5 g. Ba(OH)₂ in 50 mL. EtOH, refluxed and stirred for 5 h., give 46% of trans-2,3-dimethyl-2-butene-1,4-diol (VII), m. 57-8° (bisphenylurethane, m. 157-7.5°); the cis-isomer (VIII), b₅ 110-15° (bisphenylurethane, m. 147-8°). Pinacol and aqueous HBr give 2,3-dibromo-2,3-dimethylbutane, m. 177-7.5° (sealed tube). The following values for μ × 10¹⁸ are given: II 1.72, III 2.49, IV 1.55, V 1.90, VI 2.58, VII 1.93, VIII 2.52, and trans-1,4-dibromo-2-butene 1.63. The phys. and chem. evidence affords reasonable grounds for assigning the trans-configuration to II, V, and VII. All the evidence is consistent with the view that III is the cis-isomer and that VI and VIII are largely, if not entirely, the cis-isomers.

Journal of the American Chemical Society published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C17H37NO3, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary