144025-03-6Relevant articles and documents
Nematic stability of 2,2′,4-trifluoro-4″-alkyl-[1,1′:4′,1″]terphenyls and its deuterated isotopologue
Pytlarczyk, Marta,Gaczo?, Kornelia,Harmata, Piotr,Dziaduszek, Jerzy,Herman, Jakub
, (2021)
In this work we present three synthetic methodologies of 2,2′,4-trifluoro-4″-alkyl-[1,1′:4′,1″]terphenyls. The most convenient synthetic method was used for homologous series of 2,2′,4-trifluoro-4″-alkyl-[1,1′:4′,1″]terphenyls (alkyl chain from methyl to hexyl). The results show that fluorination in the inner-core position (at 2 and 2′ position of terphenyl core) promotes only a nematic phase. The results have also been discussed with other chloro- and fluoro- substituted 4″-alkyl-[1,1′:4′,1″]terphenyls and one perdeuterated terphenyl analogue. The synthesis and purity of synthesized compounds were monitored by gas chromatography GC-MS, GC-FID and by thin layer chromatography (TLC). The phase situation and the phase transition temperatures were determined by polarized optical microscopy (POM). The temperatures and enthalpies of the phase transitions were measured by using differential scanning calorimetry (DSC).
ORGANIC METAL COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE EMPLOYING THE SAME
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, (2016/07/05)
Organic metal compounds and organic electroluminescence devices employing the same are provided. The organic metal compound has a chemical structure represented below: wherein R1, R2, R3, R4, and R5 are independent and can be hydrogen, halogen, C1-8 alkyl or C1-8alkoxy; L can be acetylacetone ligand, picolinic acid ligand, N,N′-diisopropylbenzamidinate, or N,N′-diisopropyl-diisopropyl-guanidinate.
Substituent effects on aryltrifluoroborate solvolysis in water: Implications for Suzuki-Miyaura coupling and the design of stable 18F-labeled aryltrifluoroborates for use in PET imaging
Ting, Richard,Harwig, Curtis W.,Lo, Justin,Li, Ying,Adam, Michael J.,Ruth, Thomas J.,Petrin, David M.
, p. 4662 - 4670 (2008/09/20)
(Chemical Equation Presented) Whereas electron withdrawing substituents retard the rate of aryltrifluoroborate solvolysis, electron-donating groups enhance it. Herein is presented a Hammett analysis of the solvolytic lability of aryltrifluoroborates where log(Ksolv) values correlate to a values with a ρ value of approximately -1. This work provides a predictable rubric for tuning the reactivity of boron for several uses including 18F-labeled PET reagents and has mechanistic implications for ArBF3-enhanced ligandless metal-mediated cross coupling reactions with aryltrifluoroborates.