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Upstream product

• 123-11-5 4-methoxy-benzaldehyde 
• 157251-21-3 Diethyl <<(triphenylphosphoranylidene)amino>methy>phosphonate 
• 86423-51-0 diethyl (E)-N-(4-methoxybenzyliden)aminomethylphosphonate 

Relevant academic research and scientific papers

Synthesis and characterization of radical cations derived from mono- And biferrocenyl-substituted 2-Aza-1,3-butadienes: A study of the influence of an asymmetric and oxidizable bridge on intramolecular electron transfer

The synthesis and study of structural and electronic properties of mono-ferrocenyl π-conjugated complexes 5a-d, whose electronic characteristics have been systematically varied by introducing an electron-donating or electron-withdrawing substituent either at the 1-position or at the 4-position of the 2-aza-1,3-butadiene moiety linked to the ferrocenyl unit, are presented. The structural and electronic properties of the homobimetallic complex 5f, with two ferrocene units linked through the asymmetric and oxidizable 2-aza-1,3-butadiene bridge, is also reported. The crystal structures of complexes 5b, 5d, and 5f show a large degree of conjugation in this family of compounds. Complexes 5 show a rich electrochemical behavior due both to the oxidation of ferrocenyl units and the 2-aza-1,3-butadiene bridge, as revealed by cyclic voltammetry. Radical cations 5+. were prepared from 5 by coulomet ric oxidations following their generation by absorption spectroscopy. The electronic properties of all reported neutral and oxidized π-conjugated complexes have been investigated by means of UV/Vis-near-IR, EPR and 57Fe Moessbauer spectroscopy. The detailed study of mono-oxidized species 5a+.-5f+. has permitted the determination of the influence of an asymmetric bridge with an electroactive character on the intramolecular electron transfer (IET) phenomenon, thus demonstrating that the 2-aza-1,3-butadiene bridge promotes the IET between the two metallic units of 5f+. through two different pathways. The experimental data and conclusions are supported by DFT computations (B3LYP/3-21G*) and time-dependent DFT methods. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.

Convenient Preparations of Diethyl phosphonates, 2-Azabutadienes, and Isoquinolines from a 1,2-Monoazabisylide Equivalent

Diethyl methyl>phosphonate (4), prepared in situ by treatment of 1-methyl>benzotriazole (betmip 6) with diethyl phosphite anion, is converted by treatment with butyllithium into the corresponding carbanion 5.Carbanion 5, the first example of a 1,2-monoazabisylide equivalent, provides a versatile synthetic method to introduce the C=NC=C structural unit, as illustrated by convenient preparations of 1,4-diaryl-2-azabutadienes, 1,1,4,4-tetraaryl-2-azabutadienes, diethyl phosphonates, and isoquinolines.