862852-62-8Relevant academic research and scientific papers
An efficient synthetic method of 1-(2,4,6-Tri-t-butylphenyl)-3-phenyl-1- phosphaallenes [Mes*P=C=CR-Ph; R = H, SiMe3] from Dibromophosphaethene [Mes*P=CBr2] (Mes* = 2,4,6-t-Bu 3C6H2)
Ito, Shigekazu,Sekiguchi, Satoshi,Freytag, Matthias,Yoshifuji, Masaaki
, p. 1142 - 1144 (2005)
2-Bromo-3-phenyl-1-(2,4,6-tri-t-butylphenyl)-3-trimethylsiloxy-1-phospha-1- propene reacted with t-butyllithium and chlorotrimethylsilane to afford 3-phenyl-1-(2,4,6-tri-t-butylphenyl)-1-phosphaallene and/or 3-phenyl-3- trimethylsilyl-1-(2,4,6-tri-t-butyl
π-extended DPCB for activation-free homogeneous gold catalysis
Ito, Shigekazu,Nanko, Masaki,Mikami, Koichi
, p. 2292 - 2297 (2014/08/18)
The catalytic properties of bis[chlorogold(I)] complexes that bear the 3,4-bis(2,4,6-tri-tert-butylphenyl)-3,4-diphosphinidenecyclobutene (DPCB) ligand could be improved by suitable extension of the π-conjugation. If the 1-naphthyl substituent was employed in the 1,2-positions in the kinetically stabilized DPCB skeleton, high catalytic activity of the DPCB-bis(chlorogold) complex was induced in the intermolecular alkoxycyclization of 1,6-enyne without activation by a Ag cocatalyst. DFT calculations of the 1,2-diaryl-substituted DPCB derivatives indicated that both suitable energetic reduction of the LUMO level and steric characteristics of the ligand structure are important for the high catalytic activity. The optimized 1-naphthyl-substituted DPCB-chlorogold(I) complex was further employed for catalytic intramolecular cyclizations to afford heterocyclic structures by the activation of terminal acetylene and allene moieties and the hydration of terminal acetylene under the mild conditions.
Facile [3+2] dimerization and formal dehydrogenative coupling mode of a cyanophenylphosphaallene
Ito, Shigekazu,Hashino, Sou,Morita, Noboru,Yoshifuji, Masaaki,Hirose, Daisuke,Takahashi, Masae,Kawazoe, Yoshiyuki
, p. 10246 - 10252 (2008/02/13)
Due to a facile head-to-tail [3+2] dimerization, even a sterically demanding group such as the Mes* (2,4,6-tri-tert-butylphenyl) group around the P{double bond, long}C{double bond, long}C moiety did not allow us to isolate 3-(4-cyanophenyl)-1-(
