157305-62-9Relevant academic research and scientific papers
On the asymmetric rh(I) catalyzed [4 +2] cycloisomerization reaction. Electronic and torsional ligand control of absolute stereoselection
McKinstry, Lydia,Livinghouse, Tom
, p. 6145 - 6154 (1994)
The use of bisphosphine ligands related to DIOP as chiral modifiers in the Rh(I) catalyzed [4+2] cycloisomerization reaction results in moderate to good levels of enantioselection.
METHOD FOR FORMING AN EXTRACTION AGENT FOR THE SEPARATION OF ACTINIDES FROM LANTHANIDES
-
Page/Page column 8, (2010/04/30)
An extraction agent for the separation of trivalent actinides from lanthanides in an acidic media and a method for forming same are described, and wherein the methodology produces a stable regiospecific and/or stereospecific dithiophosphinic acid that can
Electron withdrawing substituents on equatorial and apical phosphines have opposite effects on the regioselectivity of rhodium catalyzed hydroformylation
Casey, Charles P.,Lin Paulsen, Evelyn,Beuttenmueller, Eckart W.,Proft, Bernd R.,Petrovich, Lori M.,Matter, Brock A.,Powell, Douglas R.
, p. 11817 - 11825 (2007/10/03)
The electronic effects of electron withdrawing aryl substituents on equatorial and apical diphosphines were investigated. Chelating diphosphines designed to coordinate in diequatorial or in apical-equatorial positions were synthesized, and their effects on the regioselectivity of rhodium catalyzed 1-hexene hydroformylation were observed, Only diequatorial coordination was observed for 2,2'-bis[(diphenylphosphino)methyl]-1,1'-biphenyl (BISBI) complexes (BISBI)Ir(CO)2H (8) and [BISBI-(3,5-CF3)]Ir(CO)2H (10), and only apical-equatorial coordination was seen for 1,2-bis(diphenylphosphino)ethane (DIPHOS) complexes (DIPHOS)Ir(CO)2H (14) and [DIPHOS-(3,5-CF3)]Ir(CO)2H (15). For the trans-1,2-bis[(diphenylphosphino)methyl]cyclopropane (T-BDCP) complexes, a mixture of diequatorial and apical-equatorial complexes was seen. For (T-BDCP)Ir(CO)2H (12), 12-ae was favored over 12-ee by 63:37, but for [T-BDCP-(3,5-CF3)]Ir(CO)2H (13) the conformational preference was reversed and a 10:90 ratio of 13-ae:13-ee was seen. The electron withdrawing groups in the equatorial positions of BISBI-(3,5-CF3) (1) and T-BDCP-(3,5-CF3) (2) led to an increase in n-aldehyde regioselectivity in rhodium catalyzed hydroformylation. However, electron withdrawing aryl substituents in the apical positions of DIPHOS-(3,5-CF3) (3) led to a decrease in n-aldehyde regioselectivity in rhodium catalyzed hydroformylation.
