Tag: M.W=200-250

Lu, Cuifen; Lu, Taotao; Cui, Peng; Kilina, Svetlana; Sun, Wenfang published the artcile< Photophysics and reverse saturable absorption of cationic dinuclear iridium(III) complexes bearing fluorenyl-tethered 2-(quinolin-2-yl)quinoxaline ligands>, Name: 2-Amino-5-bromobenzaldehyde, the main research area is fluorenyl tethered quinolinylquinoxaline iridium dinuclear complex preparation photophysics phosphorescence.

The synthesis, photophysics and reverse saturable absorption of two cationic dinuclear Ir(III) complexes bearing fluorenyl-tethered 2-(quinolin-2-yl)quinoxaline (quqo) ligands are reported in this paper. The two complexes possess intense and featureless diimine ligand localized 1ILCT (intraligand charge transfer)/1π,π* absorption bands at ca. 330 and 430 nm, and a weak 1,3MLCT (metal-to-ligand charge transfer)/1,3LLCT (ligand-to-ligand charge transfer) absorption band at >500 nm. Both complexes exhibit weak dual phosphorescence at ca. 590 nm and 710 nm, which are attributed to the 3ILCT/3π,π* and 3MLCT/3LLCT states, resp. The low-energy 3MLCT/3LLCT state also gives rise to a moderately strong triplet excited-state absorption at 490-800 nm. Because of the stronger triplet excited-state absorption than the ground-state absorption of these complexes at 532 nm, both complexes manifest a moderate reverse saturable absorption (RSA) at 532 nm for ns laser pulses. Expansion of the π-conjugation of the fluorenyl-tethered diimine ligand in Ir-1 causes a slight red-shift of the 1ILCT/1π,π* absorption bands in its UV-vis absorption spectrum and the 3MLCT/3LLCT absorption band in the transient absorption spectrum and slightly enhances the RSA at 532 nm compared to that in Ir-2. This work represents the first report on dinuclear Ir(III) complexes that exhibit RSA at 532 nm.

Dalton Transactions published new progress about Charge transfer transition. 29124-57-0 belongs to class bromides-buliding-blocks, and the molecular formula is C7H6BrNO, Name: 2-Amino-5-bromobenzaldehyde.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

El Sherbini, Ashraf M.; El Farash, Ahmed H.; El Sherbini, Tharwat M.; Parigger, Christian G. published the artcile< Opacity corrections for resonance silver lines in nano-material laser-induced plasma>, Category: bromides-buliding-blocks, the main research area is .

Q-switched laser radiation at wavelengths of 355, 532, and 1064 nm from a Nd: YAG laser was used to generate plasma in laboratory air at the target surface made of nano-silver particles of size 95 10 nm. The emitted resonance spectra from the neutral silver at wavelengths of 327.9 nm and 338.2 nm indicate existence of self-reversal in addition to plasma self-absorption. Both lines were identified in emission spectra at different laser irradiation wavelengths with characteristic dips at the un-shifted central wavelengths. These dips are usually associated with self-reversal. Under similar conditions, plasmas at the corresponding bulk silver target were generated. The recorded emission spectra were compared to those obtained from the nano-material target. The comparisons confirm existence of self-reversal of resonance lines that emerge from plasmas produced at nano-material targets. This work suggests a method for recovery of the spectral line shapes and discusses practical examples. In addition, subsidiary calibration efforts that utilize the Balmer series H-line reveal that other Ag I lines at 827.35 nm and 768.7 nm are optically thin under variety of exptl. conditions and are well-suited as reference lines for measurement of the laser plasma electron d.

Atoms published new progress about 82-73-5. 82-73-5 belongs to class bromides-buliding-blocks, and the molecular formula is C8H3BrO3, Category: bromides-buliding-blocks.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Yadav, J. S.; Subba Reddy, B. V. published the artcile< Microwave-assisted efficient synthesis of N-arylamines in dry media>, Synthetic Route of 19128-48-4, the main research area is arylamine microwave assisted preparation; aryl halide reaction secondary amine microwave.

A novel and efficient synthesis of N-arylamines by the reaction of activated aryl halides with secondary amines in the presence of basic Al2O3 under microwave irradiation in solvent free conditions is reported.

Green Chemistry published new progress about Amines Role: RCT (Reactant), RACT (Reactant or Reagent). 19128-48-4 belongs to class bromides-buliding-blocks, and the molecular formula is C6H3BrClNO2, Synthetic Route of 19128-48-4.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Jow, Kenny G.; Dingemans, Theo J. published the artcile< Liquid crystals derived from 2-phenylisoindoles: synthesis and characterization>, Formula: C8H3BrO3, the main research area is phenylisoindole preparation smectic A liquid crystal.

2-Phenylisoindole was studied as the rigid core unit in asym. mesogenic mols. When the 2-phenylisoindole core was terminated with a hexyl tail, no mesophase formation could be observed When 4-(tridecafluorohexyl) was used, however, both monotropic and enantiotropic phase behavior were observed Most functionalities at the anhydride 5-position gave smectic A (SmA) phases in the temperature range 70-180°. Functionalities at the anhydride 4-position suppress mesophase formation. Large substituents (Br, NO2) and sym. substitution patterns (5,6-dichloro, 4,7-dichloro and 4,5,6,7-tetrachloro) on the anhydride moiety increase the m.p. and destabilize the mesophase. Temperature dependent x-ray diffraction experiments suggest an interdigitated SmA packing for this family of compounds

Liquid Crystals published new progress about Liquid crystal transition. 82-73-5 belongs to class bromides-buliding-blocks, and the molecular formula is C8H3BrO3, Formula: C8H3BrO3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Sun, Bin; Ding, Hao; Tian, Hai-Xia; Huang, Pan-Yi; Jin, Can; Wu, Chun-Lei; Shen, Run-Pu published the artcile< Photo-Triggered Self-Induced Homolytic Dechlorinative Sulfonylation/Cyclization of Unactivated Alkenes: Synthesis of Quinazolinones Containing a Sulfonyl Group>, Formula: C7H6BrNO2, the main research area is quinazolinone containing sulfonyl group regioselective preparation photochem green chem; sulfonyl chloride quinazolinone tandem sulfonylation heterocyclization energy transfer photocatalyst.

A self-photocatalyzed sulfonylation/cyclization of quinazolinones containing unactivated alkenes with various sulfonyl chlorides was developed. The protocol provided access to sulfonyl radicals via energy transfer from quinazolinone skeleton to sulfonyl chloride. Notably, transformations proceeded without any external photocatalysts, additives, or oxidants, providing an alternative method for fabricating sulfonylated compounds I [R = Et, cyclopropyl, Ph, etc.; R1 = H, 3-F, 2-MeO, etc.; n = 0, 1].

Advanced Synthesis & Catalysis published new progress about Alkenes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 20776-50-5 belongs to class bromides-buliding-blocks, and the molecular formula is C7H6BrNO2, Formula: C7H6BrNO2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Deiana, Luca; Ghisu, Lorenza; Afewerki, Samson; Verho, Oscar; Johnston, Eric V.; Hedin, Niklas; Bacsik, Zoltan; Cordova, Armando published the artcile< Enantioselective heterogeneous synergistic catalysis for asymmetric cascade transformations>, SDS of cas: 3893-18-3, the main research area is enal alkyne asym cascade cyclization spirocyclization palladium silica catalyst; cyclopentenealdehyde asym synthesis; spiro oxindole asym synthesis.

A modular design for a novel heterogeneous synergistic catalytic system, which simultaneously activates the electrophile and nucleophile by the combined activation modes of a sep. metal and non-metal catalyst, for asym. cascade transformations on a solid surface is disclosed. This modular catalysis strategy generates carbocycles (≤97.5:2.5 er) as well as spirocyclic oxindoles (97.5:2.5 to >99:0.5 er), containing all-C quaternary centers, in a highly enantioselective fashion via a one-pot dynamic relay process.

Advanced Synthesis & Catalysis published new progress about Cyclization catalysts, stereoselective. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, SDS of cas: 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Sun, Bin; Tang, Xiaoli; Shi, Rongcheng; Yan, Zhiyang; Li, Bingqian; Tang, Chen; Jin, Can; Wu, Chunlei L.; Shen, Runpu P. published the artcile< Self-photocatalyzed Homolytic Dehalogenative Alkylation/Cyclization of Unactivated Alkenes Based on the Quinazolinone Skeleton via Energy Transfer>, SDS of cas: 20776-50-5, the main research area is alkyl quinazolinone preparation regioselective green chem energy transfer; unactivated alkene halide dehalogenative alkylation cyclization self photocatalysis.

A mild, external photocatalyst- and additive-free protocol for photo-induced alkylation/cyclization of unactivated alkenes with halides has been developed. This strategy showed excellent regioselectivity and simple operation to synthesize alkyl-substituted quinazolinones with a broad substrate scope. More importantly, chlorinated alkanes were also compatible with this transformation.

Asian Journal of Organic Chemistry published new progress about Bromoalkanes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 20776-50-5 belongs to class bromides-buliding-blocks, and the molecular formula is C7H6BrNO2, SDS of cas: 20776-50-5.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

White, Nicholas A.; Rovis, Tomislav published the artcile< Oxidatively Initiated NHC-Catalyzed Enantioselective Synthesis of 3,4-Disubstituted Cyclopentanones from Enals [Erratum to document cited in CA163:331092]>, Electric Literature of 3893-18-3, the main research area is erratum NHC catalyst oxidative enantioselective cyclization aryl enal; cyclopentanone stereoselective preparation erratum.

On page 10113, Scheme 1 contained a typog. error for intermediate IV; the corrected scheme is given.

Journal of the American Chemical Society published new progress about Enantioselective synthesis. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Electric Literature of 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Xu, Guangqing; Li, Minghong; Wang, Shouliang; Tang, Wenjun published the artcile< Efficient synthesis of P-chiral biaryl phosphonates by stereoselective intramolecular cyclization>, Quality Control of 135999-16-5, the main research area is chiral biaryl phosphonate stereoselective preparation; palladium catalyzed intramol asym cyclization diaryl bromo arylphosphonate; crystal mol structure biaryl phosphonate.

A series of P-chiral biaryl phosphonates were efficiently synthesized from diaryl 2-bromo arylphosphonates in high yields (up to 92%) and good enantioselectivities (up to 88% ee) through a palladium-catalyzed asym. cyclization with a novel P-chiral biaryl monophosphorus ligand. The P-chiral biaryl phosphonate can be rapidly transformed to both antipodes of a P-chiral dialkyl biaryl monophosphorus structure. The method provides a convenient access to various P-chiral biaryl monophosphines.

Organic Chemistry Frontiers published new progress about Crystal structure. 135999-16-5 belongs to class bromides-buliding-blocks, and the molecular formula is C7H7BrO2, Quality Control of 135999-16-5.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary