233584-42-4Relevant articles and documents
Tetra-Aza-Pentacenes by means of a One-Pot Friedl?nder Synthesis
Ukwitegetse, Narcisse,Saris, Patrick J. G.,Sommer, Jonathan R.,Haiges, Ralf M.,Djurovich, Peter I.,Thompson, Mark E.
supporting information, p. 1472 - 1475 (2019/01/04)
Tetra-aza-pentacenes are attractive n-type small molecules for optoelectronic device applications, yet their syntheses are often laborious. Disclosed here is a one-pot Friedl?nder synthesis of 1,7,8,14-tetraazapentacece (tAP) derivatives (linear and/or be
Formation and Activation of Zr/Hf Bis(phenolate-ether) Precatalysts
Cuthbert, Eric N. T.,Busico, Vincenzo,Herbert, David E.,Budzelaar, Peter H. M.
supporting information, p. 3396 - 3410 (2019/08/12)
Zr and Hf complexes of bis(phenolate-ether) (“O4”) ligands feature high activity, stereoselectivity and molecular weight capability for propene polymerization at high temperature. Here we report a simplified ligand synthesis and several new examples of O4
Vaulted biaryls in catalysis: A structure-activity relationship guided tour of the immanent domain of the VANOL ligand
Guan, Yong,Ding, Zhensheng,Wulff, William D.
, p. 15565 - 15571 (2013/11/19)
The active site in the BOROX catalyst is a chiral polyborate anion (boroxinate) that is assembled in situ from three equivalents of B(OPh) 3 and one of the VANOL ligand by a molecule of substrate. The substrates are bound to the boroxinate by Hbonds to oxygen atoms O1-O3. The effects of introducing substituents at each position of the naphthalene core of the VANOL ligand are systematically investigated in an aziridination reaction. Substituents in the 4,4′- and 8,8′-positions have a negative effect on catalyst performance, whereas, substituents in the 7- and 7′-positions have the biggest impact in a positive direction. VANOL destination: The active site in the BOROX catalyst is a chiral polyborate anion (boroxinate; see figure) that is assembled in situ from three equivalents of B(OPh)3 and one of the VANOL ligand by a molecule of substrate. The effects of introducing substituents at each position of the naphthalene core of the VANOL ligand are systematically investigated in an aziridination reaction. Copyright
Syntheses of sterically hindered zwitterionic pyridinium phenolates as model compounds in nonlinear optics
Diemer, Vincent,Chaumeil, Helene,Defoin, Albert,Fort, Alain,Boeglin, Alex,Carre, Christiane
experimental part, p. 1767 - 1776 (2009/04/11)
Pyridinium phenolates possess a dissymmetric delocalised π-electron system providing a huge quadratic nonlinearity. They are a promising class of molecules for applications in photoelectronics and photonics. Semiempirical calculations indicate that the interplanar angle between the two aromatic rings leads to enhancement in the NLO properties of these compounds. The confirmation of this feature may be provided by the study of a new series of sterically hindered pyridinium phenolates 2a-e bearing two tert-butyl substituents at the ortho position(s) of the phenolate functionality. Such bulky groups would enhance the solubility of zwitterions in organic solvents and would limit the formation of aggregates. Their efficient preparations by using Suzuki cross-coupling reactions involving 3,5-dialkylated 4-bromopyridine N-oxides are described herein. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
Formation of hetero-boroxines: Dynamic combinatorial libraries generated through trimerization of pairs of arylboronic acids
Tokunaga, Yuji,Ueno, Hiroki,Shimomura, Youji
, p. 219 - 223 (2008/09/17)
Condensation of pairs of arylboronic acids provided homo- and hetero-boroxines in solution as evidenced from NMR spectra, and those boroxines were detected in the gas phase by GC-MS spectrometry. Equilibrium constants for the formation of these boroxines in solution were obtained through integration of pertinent signals in the NMR spectra of the mixtures ofboronic acids.