40775-32-4Relevant academic research and scientific papers
Preparation of Poly(2,5-diheptyl-1,4-phenylenevinylene) by Sulfonium Salt Pyrolysis
Sonoda, Yoriko,Kaeriyama, Kyoji
, p. 853 - 857 (1992)
Poly(2,5-diheptyl-1,4-phenylenevinylene) (1) was prepared by the sulfonium salt pyrolysis procedure.Tough films of 1 were obtained by pyrolysis of its sulfonium salt precursor film.Due to flexible side chains, 1 was soluble in organic solvents such as chloroform.The molecular weights were Mn=3.8-4.7*104 and Mw=1.4-1.8*105.The ratio of trans to cis olefinic units was found to be 93:7 from the 1H NMR spectrum.Two arylmethylene peaks suggested that there were two kinds of stereochemically different methylene groups.Although the peak energy in the absorption spectra was almost identical to those of poly(1,4-phenylenevinylene) (PPV), the electrical conductivity of 1 was much lower than that of PPV.
Two flavors of PEPPSI-IPr: Activation and diffusion control in a single NHC-ligated Pd catalyst?
Larrosa, Igor,Somoza, Clara,Banquy, Alexandre,Goldup, Stephen M.
supporting information; experimental part, p. 146 - 149 (2011/03/20)
Abnormal reactivity has been observed in Negishi, Suzuki-Miyaura, and Kumada-Tamao-Corriu cross-couplings in which PEPPSI-IPr (where PEPPSI stands for pyridine enhanced precatalyst preparation, stabilization, and initiation and IPr refers to the NHC ligand) is employed, implicating the presence of two distinct Pd0 species in the catalytic cycle. Polybrominated arenes and organometallic reagents react selectively to give the product of exhaustive polysubstitution regardless of the initial reaction stoichiometry. Competition experiments suggest that, after an initial activation controlled oxidative addition, reductive elimination produces an ultrareactive Pd0 species which consumes all remaining C-Br bonds in the molecule under diffusion control.
SYNTHESIS AND SPECTROSCOPY OF 1,4-DIALKYLBENZENES
Issac, Yvette A.,El-Zein, S. M.,Barakat, Y.
, p. 463 - 470 (2007/10/02)
Five linear 1,3-dialkylbenzenes namely, dibutyl-, dipentyl-, dihexyl-, diheptyl- and dioctylbenzenes were prepared in good yield via two simple catalytic routes under very mild conditions and affording insignificant side products, The starting feed, 1,4-d
