16611-68-0Relevant articles and documents
Synthesis, antioxidant and antimicrobial activity of novel benzene-1,4-diamine-bis-dioxaphosphepine-6λ5 iminophosphoranes
Veera Narayana Reddy,Chandra Sekhar Reddy,Suresh Kumar,Suresh Reddy,Naga Raju
, p. 538 - 542 (2010)
(Chemical Equation Presented). A new class of novel benzene-1,4-diamine- bis-dioxaphosphepine-6λ5 iminophosphoranes (5a-j) were synthesized by the reaction of 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepine (2) with 1,4-diaminobenzene to form bis-dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl- benzene-diamine (3). Its subsequent reaction with different alkyl/aryl azides (4a-j) in tetrahydrofuran at 50-60°C under inert atmosphere yielded title compounds. Their structures were established by elemental analysis, IR, 1H, 13C, 31P NMR, and mass spectral studies. All the title compounds were screened for antioxidant properties and found to exhibit potent in vitro antioxidant and antimicrobial activity.
Asymmetric induction by the cholestanic moiety on Tropos species: Synthesis and stereochemical characterization of bile acid-based biphenyl phosphites
Iuliano,Facchetti,Uccello-Barretta
, p. 4943 - 4950 (2006)
Three different bile acid-derived biphenyl phosphites were synthesized, starting from cholic and deoxycholic acids and biphenol, and their stereochemical features were checked by CD and NMR spectroscopies. On the basis of the spectroscopic results, the ca
Rh-Catalyzed Stereospecific Synthesis of Allenes from Propargylic Benzoates and Arylboronic Acids
Ruchti, Jonathan,Carreira, Erick M.
, p. 2174 - 2176 (2016)
An enantiospecific approach to the synthesis of optically active, trisubstituted allenes from chiral propargylic benzoates and arylboronic acids has been developed. The transformation is catalyzed by a Rh-(P,olefin) complex formed in situ from [{Rh(cod)Cl
Rh(I) complexes with new C2-symmetric chiral diphosphoramidite ligands: Catalytic activity for asymmetric hydrogenation of olefins
Drommi, Dario,Arena, Carmela Grazia
, (2017)
The design and synthesis of three new C2-symmetric chiral diphosphoramidite ligands starting from simple and cheap building blocks have been developed. Rhodium(I) cationic complexes bearing these chelate ligands have been prepared and applied in asymmetric hydrogenation of model olefins. A rhodium complex with a diphosphoramidite containing a chiral diamine configurationally stable and two fluxional chiral biphenyl units gave higher enantioselectivity with increasing hydrogen pressure (87% ee) in the hydrogenation of dimethyl itaconate.
QUANTITATIVE CHIRALITY AND CONCENTRATION SENSING OF CHIRAL ANALYTES USING A RELAY ASSAY
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Paragraph 0132-0133; 0135, (2021/11/13)
The present application relates to an analytical method that includes providing a sample potentially containing a chiral analyte that can exist in stereoisomeric forms, providing certain probes; and providing an indicator. The sample is contacted with an
Air Stable Iridium Catalysts for Direct Reductive Amination of Ketones
Polishchuk, Iuliia,Sklyaruk, Jan,Lebedev, Yury,Rueping, Magnus
supporting information, p. 5919 - 5922 (2021/03/08)
Half-sandwich iridium complexes bearing bidentate urea-phosphorus ligands were found to catalyze the direct reductive amination of aromatic and aliphatic ketones under mild conditions at 0.5 mol % loading with high selectivity towards primary amines. One of the complexes was found to be active in both the Leuckart–Wallach (NH4CO2H) type reaction as well as in the hydrogenative (H2/NH4AcO) reductive amination. The protocol with ammonium formate does not require an inert atmosphere, dry solvents, as well as additives and in contrast to previous reports takes place in hexafluoroisopropanol (HFIP) instead of methanol. Applying NH4CO2D or D2 resulted in a high degree of deuterium incorporation into the primary amine α-position.
Synthesis method of novel large-steric-hindrance biphenol skeleton and tridentate phosphite ligand thereof
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Paragraph 0037-0040, (2021/02/10)
The invention discloses a synthesis method of a novel large-steric-hindrance biphenol skeleton 2, 2', 6-trihydroxy-3, 3', 5, 5'-tetra-tert-butyl-1, 1'-biphenyl and a tridentate phosphite ligand thereof. The novel biphenyl tridentate phosphite ligand has a structure as shown in a general formula I, and a substituent R in the general formula I can be a cyclic phosphine structure. The novel biphenyltridentate phosphite ligand has good conversion rate and normal-to-isomeric ratio in a mixed/etherified C4(butylene) hydroformylation reaction system.
