- N-Heterocyclic carbene (NHC)-catalyzed intramolecular benzoin condensation-oxidation
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NHC-Catalyzed intramolecular benzoin condensation-oxidation is developed for the expedient synthesis of diverse cyclic 1,2-diketones incorporated in dibenzo-fused seven-membered heterocycles in good to excellent yields, under ambient conditions. The prese
- Satyam, Killari,Ramarao, Jakkula,Suresh, Surisetti
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p. 1488 - 1492
(2021/03/01)
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- Bis(imino)diphenylamido rare-earth metal dialkyl complexes: Synthesis, structure, and catalytic activity in living ring-opening ε-caprolactone polymerization and copolymerization with γ-butyrolactone
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Bis(imino)diphenylamido rare-earth metal dialkyl complexes [o-(2,6- iPr2-C6H3-NC-C6H 4)2-N]Ln(CH2SiMe3)2 (1: Ln = Sc; 2: Ln = Lu; 3: Ln = Y) have
- Du, Gaixia,Wei, Yanling,Zhang, Wei,Dong, Yuping,Lin, Zhengguo,He, Huan,Zhang, Shaowen,Li, Xiaofang
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p. 1278 - 1286
(2013/02/23)
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- Metal-free and dicopper(II) complexes of schiff base [2 + 2] macrocycles derived from 2,20-iminobisbenzaldehyde: Syntheses, structures, and electrochemistry
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Three new bis-terdentate Schiff base [2 + 2] macrocycles (H2LEt, H2LPr, and H2LBu) have been prepared in high yields by 1:1 condensation of 2,20- iminobisbenzaldehyde with 1,2-diaminoethane, 1,3-diaminopropane, and 1,4-diaminobutane, respectively. Metalation of these macrocycles yields the corresponding dicopper(II) acetate (1, 2, and 3) and tetrafluoroborate (4, 5, and 6) complexes. The structures of H2EtPr, H2LPr, H2L Bu, [CuII 2Li(OAc)2] 3 solvents (where i is Et, Pr or Bu) and [CuII 2LPr(DMF)4] (BF2)2 3 0.5H2Oare reported. Intramolecular hydrogen bonding is a feature of the metal-free macrocycles. The copper(II) centers in [CuII 2Li(OAc)2] 3 solvents are four coordinate, and the macrocycles have U-shaped (Et, Bu) or stepped (Pr) conformations. Complex 5 crystallizes with two dimethylformamide (DMF) molecules bound per five coordinate copper(II) center. Electrochemical studies revealed ligand based oxidations for all of the macrocycles and complexes. Complexes 1 and 2 undergo two quasi-reversible oxidations in DCM which are associated with the deposition of a visible film on the electrode after multiple scans in this oxidative region, suggestive of electropolymerization. Complexes 4-6, studied in MeCN, have CuII f CuI redox potentials at more positive potentials than for 1-3.
- Cameron, Scott A.,Brooker, Sally
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p. 3697 - 3706
(2011/06/27)
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- A New Synthesis of 5H-Dibenzazepin-5-carboxamide (Carbamazepine)
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5H-Dibenzazepin-5-carboxamide (VI) has been synthesised starting from 2,2'-diformyldiphenylamine (III).III on cyclization with hydrazine hydrate in acetic acid gives the azepine (IV) which on treatment with COCl2 followed by ammonia affords VI, identical with an authentic sample.
- Sinha, A. K.,Agarwal, P. K.,Nizamuddin, S.
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p. 237 - 238
(2007/10/02)
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