56116-77-9Relevant academic research and scientific papers
Direct suzuki-miyaura coupling with naphthalene-1,8-diaminato (dan)-substituted organoborons
Yoshida, Hiroto,Seki, Michinari,Kamio, Shintaro,Tanaka, Hideya,Izumi, Yuki,Li, Jialun,Osaka, Itaru,Abe, Manabu,Andoh, Hiroki,Yajima, Tomoki,Tani, Tomohiro,Tsuchimoto, Teruhisa
, p. 346 - 351 (2019/12/24)
The actually direct Suzuki-Miyaura coupling with "protected" R-B(dan) (dan = naphthalene-1,8-diaminato) was demonstrated to smoothly occur without in situ deprotection of the B(dan) moiety. The use of t-BuOK (Ba(OH)2 in some cases) as a base under anhydrous conditions is the key to the successful cross-coupling, where R-B(dan) is readily converted into a transmetalation-active borate-form, regardless of the well-accepted diminished boron-Lewis acidity.
Synthesis and properties of liquid-crystalline-conjugated polymers
Akagi, Kazuo
, p. 649 - 661 (2007/10/03)
We have synthesized novel liquid-crystalline (LC)-conducting polymers by introducing LC groups into acetylene monomers and polymerizing them with Ziegler-Natta, metathesis, and rhodium-based catalysts. All polymers prepared were soluble in organic solvents and had a thermotropic liquid crystallinity characterized with fan-shaped texture in polarizing optical microscopy. Phase transitions and the corresponding enthalpy changes were also evaluated by means of differential scanning calorimeter (DSC). High-order structures of the polymers were investigated by means of X-ray diffraction (XRD) analyses. XRD measurements showed that the polymers had layered structures in the LC state to give smectic A phases, which is in agreement with the results from the polarizing optical microscope. We found that the LC side chains alternate on both sides of the polyene chain, giving rise to a stereoregular sequence, such as head-head-tail-tail linkage. Macroscopic alignments of the polymers were performed in the liquid-crystalline phase by shear stress or a magnetic force field of 0.7-1.0 Tesla, which resulted in an enhancement by two orders of magnitude in the electrical conductivity of iodine-doped cast films. Orientation behaviors of the polymers as well as the monomers were investigated using fused-state 13CNMR measurements with proton dipolar decoupling. Analysis of chemical shift tensors was also carried out to evaluate the order parameter and shielding anisotropy in the LC phase. As a result, we demonstrated that LC-conjugated polymers uniaxially aligned due to the magnetically forced alignment of the LC side-chain, giving rise to a monodomain structure.
SYNTHESIS OF LIQUID CRYSTALLINE POLYACETYLENE DERIVATIVES
Shirakawa, Hideki,Kadokura, Yasuo,Goto, Hiromasa,Oh, Se-Young,Akagi, Kazuo,Araya, Kotaro
, p. 213 - 220 (2007/10/02)
Mono-substituted acetylenes with liquid crystalline group consisting of phenylcyclohexyl and biphenyl moieties as mesogenic cores have been synthesized and polymerized using Ziegler-Natta and metathesis catalysts.Measurements of DSC and polarized microsco
