89130-15-4Relevant academic research and scientific papers
A novel series of CoIII(salen-type) complexes containing a seven-membered metallacycle: Synthesis, structural characterization and factors affecting the metallacyclization rate
Siega, Patrizia,Dreos, Renata,Brancatelli, Giovanna,Zangrando, Ennio,Tavagnacco, Claudio,Vrdoljak, Visnja,Hrenar, Tomica
, p. 909 - 920 (2014)
A series of electronically tuned trans-[CoIII(chel)(CH 2Cl)]2 complexes, where chel is a salen derivative (salen = 2,2′-ethylenebis(nitrilomethylidene)diphenol) containing either two or four methyl substituents in differen
Influences of polarizability effect of alkyl group and homoring competition effect of substituents on the NMR spectra of salen-type Schiff base
Wei, Bai-ying,Cao, Chen-zhong,Cao, Chao-tun
, p. 701 - 712 (2021/02/12)
Salen-type Schiff bases are a kind of important compounds and are widely used. In order to explore the effect of alkyl groups and substituents attached to aromatic ring on the chemical shifts, 63 title compounds were synthesized. Their 1H NMR and 13C NMR spectra were obtained; and the effects of the alkyl chain length and substituents on the chemical shifts (δH(CH=N), δC(CH=N), δH(OH), and δC(C-OH)) were studied. The results show that (1) the alkyl polarizability effect index (PEI) has an important influence on the chemical shifts of the above four atoms, with the increase of PEI, the values of δH(CH=N) and δc(CH=N) decrease, and the values of δH(OH) and δC(C-OH) increase. (2) The influence of substituent X attached to aromatic ring on the chemical shift is related to its position by taking OH or CH=N as reference. As for the effect of substituent on the chemical shifts, the effect of Hammett constant σ(X)-OH and excited-state substituent parameter (Formula presented.) with OH as reference are different from that ofσ(X)-CH=N and (Formula presented.) with CH=N as reference, and there is a “homoring competition effect” of the substituent. (3) The effect of the cross-interaction between X and OH on the chemical shift is also significantly different due to the different position of X. Quantitative correlation equations against chemical shifts were built for the four atoms, and the stability and prediction ability of the obtained equations were confirmed by leave-one-out cross validation.
Nickel complexes as efficient catalysts in multicomponent synthesis of tetrahydropyridine derivatives
Yankin, Andrei N.,Dmitriev, Maksim V.
supporting information, p. 3481 - 3489 (2020/08/13)
Ni(Salen) complexes as an efficient, homogeneous catalysts revealed a catalytic activity toward the one-pot synthesis of tetrahydropyridine derivatives through the pseudo five-component reactions of aromatic aldehydes, aromatic amines, and β-ketoesters in ethanol at room temperature. Mild reaction conditions, good yields, high diastereoseletivity, operational simplicity, and the absence of tedious separation procedures, clean reaction profiles, high atom economy, inexpensive starting materials, and environmentally benign catalyst are the key advantages of the present MCRs protocol.
Chemosensor activity of 2-(anthracen-9-yl)-substituted imidazolidines and hexahydropyrimidines
Tolpygin
scheme or table, p. 104 - 108 (2012/05/20)
A number of 2-(anthracen-9-yl)-substituted imidazolidines and hexahydropyrimidines were synthesized by reaction of N,N'-bis[aryl(hetaryl) methyl]ethylene-1,2-diamines and N,N'-bis[aryl(hetaryl)methyl]-propane-1,3- diamines with anthracene-9-carbaldehyde. The obtained compounds showed chemosensor activity toward Cd2+, Cu2+, and Hg2+ ions. Pleiades Publishing, Ltd., 2012.
