91508-53-1Relevant academic research and scientific papers
Cooperative effect of spacer and Lewis base on highly reversible spectral changes of the octaethylporphyrin chromatic system in sensitivity, stability, and visibility to trifluoroacetic acid
Kempe, Hideto,Yamamoto, Junya,Ishida, Miki,Takahashi, Nobutomo,Yoshino, Junro,Hayashi, Naoto,Higuchi, Hiroyuki
, p. 1233 - 1244 (2016)
The diacetylene-group connected chromatic system of [octaethylporphyrin]-[spacer]-[Lewis base] triads (OEP-SPC-LB) was conclusively studied, in which a trigger-like interaction of the terminal LB with trifluoroacetic acid (TFA) dramatically affects the inherent electronic properties of OEP. The 1HNMR, IR, and electronic absorption spectral properties of these OEP derivatives were examined, and were contemplated in view of a cooperative effect of SPC and LB on their OEP nucleus. Based on the results from this study, the structural elements for molecular design will be proposed in order to improve their reversible spectral changes between neutral and acidic media in terms of sensitivity, stability, and visibility to TFA.
Catalyzed M-C coupling reactions in the synthesis of s-(pyridylethynyl)dicarbonylcyclopentadienyliron complexes
Belousov, Yuri A.,Kondrasenko, Alexander A.,Semeikin, Oleg V.,Ustynyuk, Nikolai A.,Vasiliev, Alexander D.,Verpekin, Victor V.
, p. 17014 - 17025 (2020/05/18)
The reactions between terminal ethynylpyridines, (trimethylsilyl)ethynylpyridines and cyclopentadienyliron dicarbonyl iodide were studied under Pd/Cu-catalyzed conditions to develop a synthetic approach to the s-alkynyl iron complexes Cp(CO)2Fe-C?C-R (R =ortho-,meta-,para-pyridyl). Depending on the catalyst and reagents used, the yields of the desired s-pyridylethynyl complexes varied from 40 to 95%. In some cases the reactions withortho-ethynylpyridine gave as byproduct the unexpected binuclear FePd μ-pyridylvinylidene complex [Cp(CO)Fe{μ2-?1(Ca):?1(Ca)-?1(N)-Ca?C?(H)(o-C5H4N)}(μ-CO)PdI]. The conditions, catalysts, and reagents that provide the highest yields of the desired s-pyridylethynyl iron compounds were determined. The methods developed allowed the synthesis of the corresponding s-4-benzothiadiazolylethynyl complex Cp(CO)2Fe-C?C-(4-C6H3N2S) as well. Eventually, synthetic approaches to s-alkynyl iron complexes of the type Cp(CO)2Fe-C?C-R (R =ortho-,meta-,para-pyridyl, 4-benzothiadiazol-2,1,3-yl) based on the Pd/Cu-catalyzed cross-coupling reactions were elaborated.
