- An extending evidence of molecular conformation on spectroscopic properties of symmetrical bis-Schiff bases
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The relationship between the molecular conformation and spectroscopic properties of symmetrical bis-Schiff bases, was explored experimentally. The synthesis, crystal structures, and spectroscopic behaviors of symmetrical bis-Schiff bases derived from 1,4-
- Fang, Zhengjun,Cao, Chenzhong,Chen, Jianfang,Deng, Xingchen
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- Exploration of imidazole and imidazopyridine dimers as anticancer agents: Design, synthesis, and structure–activity relationship study
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Dimerization of proteins/receptors plays a critical role in various cellular processes, including cell proliferation and differentiation. Therefore, targeting such dimeric proteins/receptors by dimeric small molecules could be a potential therapeutic appr
- Meenakshisundaram, Sangeetha,Manickam, Manoj,Pillaiyar, Thanigaimalai
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- Addition of dimethyl phosphite to N,N'-dialkyl-and-diaryl terephthalaldimines and its stereochemistry contrary to behavior of other analogues
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The addition of dimethyl phosphite to N,N'-terephthalylidene-alkyl- (or aryl-) amines resulted in new tetramethyl 1,4-phenylene-bis-(N-alkylaminomethyl)-phosphonates in moderate yields. The stereochemical behavior of these reactions was studied by NMR, de
- Lewkowski, Jaros?aw,Ignaczak, Anna,Karpowicz, Rafa?,Obiedzińska, Justyna,Rodriguez-Moya, Maria
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p. 751 - 758
(2016/05/09)
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- Synthesis of bistetrahydroquinolines as potential anticholinesterasic agents by double diels-alder reactions
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The tetrahydroquinoline ring system is a unit found in many biologically active natural products and pharmacologically relevant therapeutic agents. A new series of bistetrahydroquinolines (bis-THQs) was synthesized using imino Diels-Alder reactions betwee
- Duarte, Yorley,Gutierrez, Margarita,Astudillo, Luis,Alzate-Morales, Jans,Valdes, Natalia
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p. 12951 - 12965
(2013/11/06)
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- Highly anti-anti selective synthesis of bis-β-amino ketones via three-component direct Mannich-type reaction of terephthalaldehyde catalyzed by ZrOCl2·8H2O
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At room temperature, zirconium oxychloride (ZrOCl2· 8H2O) efficiently catalyzes the direct Mannich-type reaction of a variety of in situ generated bis-imines using terephthalaldehyde and anilines with ketones in a three-component reaction at room temperature. The reaction proceeds rapidly and affords the corresponding bis-β-amino ketones in good-to-high yields with good-to-excellent anti-anti selectivity.
- Eftekhari-Sis, Bagher,Saraei, Mahnaz,Bonyad-Bagheri, Mohammad
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p. 421 - 427
(2013/07/27)
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- Bis-imine-cyclometalated macrocycles: Synthesis, characterization and observation of solution behaviour
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A novel class of cyclometalated macrocycles [(Cp*Ir) 2(R-NC-C6H2-CN-R)2] 2(pyrazine)2·(OTf)4 [R = Ph (4a), p-MeOC6H4 (4b), p-MeC6H4 (4c), p-ClC6H4 (4d), Me (4e)]; [(Cp*Rh) 2(R-NC-C6H2-CN-R)2] 2(pyrazine)2·(OTf)4 [R = Ph (4a′), p-MeOC6H4 (4b′), p-MeC6H4 (4c′)] and [(Cp*Ir)2(R-CN-C6H 4-NC-R)2]2(pyrazine)2·(OTf) 4 [R = Ph (5a), p-MeOC6H4 (5b)] was stepwise constructed through the double-site C-H activation of aromatic bis-imine substrates. The structures of binuclear complexes and tetranuclear macrocycles were confirmed by single-crystal X-ray diffraction. Isomers were found both in binuclear species and macrocyclic complexes. Flexible substrates led to the existence of isomers for binuclear species, yet gave no isomers after macrocyclic constructions; rigid ones, in contrast, led to isomers only for macrocyclic species. The isomers of tetranuclear macrocycles were thermodynamically stable to reversible transformation on a scale of days. Robust bonding and a certain degree of rigidity were invoked to explain the existence of isomers. This is the first example, to our knowledge, in which coordinated macrocycles containing half-sandwich Cp*M (M = Ir, Rh) fragments have been constructed, without a dynamic reversible process.
- Li, Hao,Han, Ying-Feng,Jin, Guo-Xin
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experimental part
p. 4982 - 4993
(2011/08/02)
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- Addition of Di-(trimethylsilyl)phosphite to N, N′-dialkyl terephthalic schiff bases: Synthesis of 1, 4-Phenylene-bis- (aminomethyl)- phosphonic acids
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The addition of di-(trimethylsilyl)- phosphite to N,N′- terephthalylidene-alkyl-(or aryl-)- amines resulted in 1, 4-phenylene-bis-(N- alkylamino- methyl)-phosphonic acids in moderate yields. The stereochemical behavior of such reactions was studied, and N
- Lewkowski, Jaroslaw,Dziegielewski, Marek
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scheme or table
p. 431 - 435
(2010/07/16)
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- The stereochemical behavior of terephthalic schiff bases in addition of dialkyl or diaryl phosphites
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Addition of dialkyl (or diaryl) phosphites to N-alkyl terephthalic Schiff bases led exclusively to a meso-form but addition to N-aryl terephthalic Schiff bases depended on the substituent of the aryl group. Semi-empirical calculations were involved to fin
- Lewkowski, Jaroslaw
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p. 179 - 195
(2007/10/03)
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- SYNTHESIS, NMR INVESTIGATION AND FAB-MS CHARACTERIZATION OF 1-AMINO-2-ARYLMETHYL-DIPHOSPHONATE ESTERS
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Variously substituted amino aryl-methyl-diphosphonate ethyl esters have been prepared in good yields by adding diethyl phosphonate to the corresponding Schiff bases.All compounds were characterized by NMR and MS-FAB techniques, which reveal the presence o
- Failla, Salvatore,Finocchiaro, Paolo,Hagele, Gerhard,Rapisardi, Roberto
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- ELECTRONIC ABSORPTION SPECTRA OF AROMATIC SCHIFF BASES. PART II. TEREPHTHALDEHYDE DERIVATIVES
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The effect of para substituents in the aniline moiety of terephthalidene-di(p-R-anilines) on their UV-VIS spectra has been studied.A linear relationship has been found between position of long-wavelength absorption bands of terephthalidene-dianilines with
- Muzalewski, Feliks,Gawinecki, Ryszard
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p. 565 - 572
(2007/10/02)
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