1466-88-2Relevant articles and documents
Dual-supramolecular contacts induce extreme Hofmann framework distortion and multi-stepped spin-crossover
Ahmed, Manan,Brand, Helen E. A.,Peterson, Vanessa K.,Clegg, Jack K.,Kepert, Cameron J.,Price, Jason R.,Powell, Benjamin J.,Neville, Suzanne M.
, p. 1434 - 1442 (2021)
An extended nitro-functionalised 1,2,4-triazole ligand has been used to induce considerable lattice distortion in a 2-D Hofmann framework materialviacompeting supramolecular interactions. Single crystal X-ray diffraction analyses on [Fe3(N-cintrz)6(Pd(CN)4)3]·6H2O (N-cintrz: (E)-3-(2-nitrophenyl)acrylaldehyde) reveal a substantial deviation from a regular Hofmann structure, in particular as the intra- and inter-layer contacts are dominated by hydrogen-bonding interactions rather than the typical π-stacking arrays. Also, the 2-D Hofmann layers show an assortment of ligand conformations and local FeIIcoordination environments driven by the optimisation of competing supramolecular contacts. Temperature-dependent magnetic susceptibility measurements reveal a two-step spin crossover (SCO) transition. Variable temperature structural analyses show that the two crystallographically distinct FeIIcentres, which are arranged in stripes (2?:?1 ratio) within each Hofmann layer, undergo a cooperative HS ? HS/LS ? LS (HS = high spin, LS = low spin) transition without periodic spin-state ordering. The mismatch between crystallographic (2?:?1) and spin-state (1?:?1) periodicity at the HS?:?LS step provides key insight into the competition (frustration) between elastic interactions and crystallographically driven order.
Sodium bismuthate mediated oxidation of allylic and benzylic alcohols
Banik, Bimal K.,Ghatak, Anjan,Venkatraman,Becker, Frederick F.
, p. 2701 - 2705 (2000)
A simple and readily available oxidation of primary allylic and benzylic alcohols to the corresponding aldehydes is carried out by sodium bismuthate in acetic acid.
(±)-Camphor sulfonic acid assisted IBX based oxidation of 1° and 2° alcohols
Kumar, Kamlesh,Joshi, Penny,Rawat, Diwan S
, (2021/09/02)
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Enantiodivergent One-Pot Synthesis of Axially Chiral Biaryls Using Organocatalyst-Mediated Enantioselective Domino Reaction and Central-to-Axial Chirality Conversion
Hayashi, Yujiro,Koshino, Seitaro,Kwon, Eunsang,Monde, Kenji,Taniguchi, Tohru
, p. 15786 - 15794 (2021/10/14)
Enantiodivergent one-pot synthesis of biaryls was developed using a catalytic amount of a single chiral source. A domino organocatalyst-mediated enantioselective Michael reaction and aldol condensation provided centrally chiral dihydronaphthalenes with excellent enantioselectivity, from which an enantiodivergent chirality conversion from central-to-axial chirality was achieved. Both enantiomers of biaryls were obtained with excellent enantioselectivity. All transformations can be conducted in a single reaction vessel. A plausible reaction mechanism for the enantiodivergence is proposed.