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Showing 1 to 12 of 128 entries
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Walphos versus Biferrocene-Based Walphos Analogues in the Asymmetric Hydrogenation of Alkenes and Ketones.

Organometallics

Zirakzadeh A, Groß MA, Wang Y, Mereiter K, Weissensteiner W.
PMID: 24795493
Organometallics. 2014 Apr 28;33(8):1945-1952. doi: 10.1021/om401074a. Epub 2014 Apr 09.

Two representative Walphos analogues with an achiral 2,2″-biferrocenediyl backbone were synthesized. These diphosphine ligands were tested in the rhodium-catalyzed asymmetric hydrogenation of several alkenes and in the ruthenium-catalyzed hydrogenation of two ketones. The results were compared with those previously...

Novel chiral biferrocene ligands for palladium-catalyzed allylic substitution reactions.

The Journal of organic chemistry

Xiao L, Weissensteiner W, Mereiter K, Widhalm M.
PMID: 11925230
J Org Chem. 2002 Apr 05;67(7):2206-14. doi: 10.1021/jo016249w.

Eleven novel aminophosphine ligands have been synthesized, all of which contain a chiral 2,2' '-bridged biferroceno unit as part of a biferrocenoazepine substructure. The efficiency of these compounds as chiral auxiliaries in palladium-mediated allylic substitution reactions has been investigated....

Biferrocene-Based Diphosphine Ligands: Synthesis and Application of Walphos Analogues in Asymmetric Hydrogenations.

Organometallics

Zirakzadeh A, Groß MA, Wang Y, Mereiter K, Spindler F, Weissensteiner W.
PMID: 23457421
Organometallics. 2013 Feb 25;32(4):1075-1084. doi: 10.1021/om3012147. Epub 2013 Feb 11.

A total of four biferrocene-based Walphos-type ligands have been synthesized, structurally characterized, and tested in the rhodium-, ruthenium- and iridium-catalyzed hydrogenation of alkenes and ketones. Negishi coupling conditions allowed the biferrocene backbone of these diphosphine ligands to be built...

Synthesis, coordination behaviour, structural features and use in asymmetric hydrogenations of bifep-type biferrocenes.

Dalton transactions (Cambridge, England : 2003)

Espino G, Xiao L, Puchberger M, Mereiter K, Spindler F, Manzano BR, Jalón FA, Weissensteiner W.
PMID: 19333499
Dalton Trans. 2009 Apr 21;(15):2751-63. doi: 10.1039/b816544k. Epub 2009 Feb 20.

A protocol for the synthesis of C2- and C1-symmetric 2,2''-diarylphosphino-substituted biferrocenes (bifep-type ligands) is presented and the preparation of four representatives is described [(Sp,Sp)-2-R1(2)P-2''- R2(2)P-1,1''-biferrocene; (bifep): R1=R2=Ph; : R1=Ph, R2=Cy; : R1=R2=3,5-Me2C6H3; : R1=3,5-Me(2-)4-OMe-C6H2, R2=3,5-(CF3)2C6H3]. In addition, the synthesis...

Synthesis and characterization of optical and redox properties of bithiophene-functionalized diketopyrrolopyrrole chromophores.

The Journal of organic chemistry

Bürckstümmer H, Weissenstein A, Bialas D, Würthner F.
PMID: 21381701
J Org Chem. 2011 Apr 15;76(8):2426-32. doi: 10.1021/jo2003117. Epub 2011 Mar 15.

A series of six new 2,2'-bithiophene-functionalized diketopyrrolopyrrole (DPP) dyes 7a-f bearing different electron-donating and electron-withdrawing substituents at the terminal thiophene units was synthesized by palladium-catalyzed cross-coupling reactions. The to date unknown diiodinated DPP 2 and the corresponding boronic ester...

Panel urges consolidation of surveys faced by hospitals.

Modern healthcare

Weissenstein E.
PMID: 10117625
Mod Healthc. 1992 May 11;22(19):30.

No abstract available.

Plan would redistribute Medicare GME funds.

Modern healthcare

Weissenstein E.
PMID: 10145180
Mod Healthc. 1995 Sep 04;25(36):60.

No abstract available.

Providers appear victorious in minimizing Medicare cuts.

Modern healthcare

Weissenstein E.
PMID: 10127394
Mod Healthc. 1993 Aug 02;23(31):3.

No abstract available.

Hillary Clinton stumps for reform in congressional panel hearings.

Modern healthcare

Wagner L, Weissenstein E.
PMID: 10128492
Mod Healthc. 1993 Oct 04;23(40):2-3.

No abstract available.

First lady to have key role in crafting reform.

Modern healthcare

Wagner L, Weissenstein E.
PMID: 10123671
Mod Healthc. 1993 Jan 25;23(4):2.

No abstract available.

Observers see Clinton win putting reforms into motion.

Modern healthcare

Wagner L, Weissenstein E.
PMID: 10122189
Mod Healthc. 1992 Nov 09;22(45):2.

No abstract available.

GOP begins detailing Medicare plans.

Modern healthcare

Weissenstein E.
PMID: 10151371
Mod Healthc. 1995 Sep 11;25(37):2.

No abstract available.

Showing 1 to 12 of 128 entries