93834-41-4Relevant academic research and scientific papers
Rhodium and rhutenium complex with optically active chelate cyclopentadienyl-phosphine bidentate ligands
Kataoka, Yasutaka,Saito, Yoshinori,Nagata, Koji,Kitamura, Kenichi,Shibahara, Atsushi,Tani, Kazuhide
, p. 833 - 834 (2007/10/03)
The first optically active cyclopentadienyl-phosphine bidentate ligands (H ligands) in which a diphenylphosphino group and a cyclopentadienyl or an indenyl group are connected by an L-threitol derivative or an (S,S)-trans-1,2-dimethylcyclopentane group have been prepared.The rodium and rhutenium complexes of their anions have been prepared and characterized.
CATALYTIC ASYMMETRIC HYDROGENATION WITH RHODIUM COMPLEXES OF IMPROVED DIOPS BEARING PARA-DIMETHYLAMINO GROUP ON THE BASIS OF OUR DESIGNING CONCEPT
Morimoto, Toshiaki,Chiba, Mitsuo,Achiwa, Kazuo
, p. 4755 - 4758 (2007/10/02)
Unsymmetrized and symmetrized DIOP analogues bearing para-dimethylamino group have been synthesized to prove the general utility of our designing concept for developing highly effective catalysts.Their rhodium complexes have been shown to be much more effective in the asymmetric hydrogenations than that of DIOP.
ASYMMETRIC HYDROGENATION OF DEHYDROAMINO ACIDS AND DEHYDRODIPEPTIDES WITH RHODIUM(I)-MODIFIED DIOP CATALYSTS.
Yamagishi,Yatagai,Hatakeyama,Hida
, p. 1897 - 1901 (2007/10/02)
( minus )-DIOP was modified in two ways: i), introduction of a large aromatic substituent at the dioxolane ring of ( minus )-DIOP and ii), replacement of one diphenylphosphino group by diarylphosphino group to give unsymmetrical DIOPs. Modification at the dioxolane ring had a small effect on the asymmetric induction by DIOP in the hydrogenation. Modification at the phosphino group affected the stereocontrol by the ligand and the unsymmetrical DIOP with di-2-naphthylphosphino group gave higher optical yields than ( minus )-DIOP for the hydrogenation of alpha -acetamidocinnamic acid and dehydrodipeptides.
