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1 article(s) from Kop-Weiershausen, T

An exceptional P-H phosphonite: Biphenyl- 2,2'-bisfenchylchlorophosphite and derived ligands (BIFOPs) in enantioselective copper- catalyzed 1,4-additions

T. Kop-Weiershausen,
J. Lex,
J.-M. Neudörfl and
B. Goldfuss

Beilstein J. Org. Chem. 2005, 1, No. 6, doi:10.1186/1860-5397-1-6

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Scheme 1: Monodentate phosphorus ligands, e.g. BINOL-based phosphoramidites or TADDOL-based phosphites, are h...

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Scheme 2: Modular phosphoramidites (R= NR'2) or phosphites (R= OR') from reactive chlorophosphite intermediat...

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Figure 1: X-ray crystal structure of BIFOP-Cl (1). Distances are given in Å. (BAA = biaryl angle between C₂-C₁...

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Figure 2: X-ray structures of BIFOP-Br (2). Distances are given in Å. (BAA = biaryl angle between C₂-C₁-C₁'-C₂...

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Scheme 3: Synthesis of biphenyl-2,2'-bisfenchol (BIFOL) based phosphane derivatives (BIFOPs).

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Figure 3: X-ray structures of BIFOP-H (3). Distances are given in Å. (BAA = biaryl angle between C₂-C₁-C₁'-C₂...

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Figure 4: X-ray structures of BIFOP-nBu (5). Distances are given in Å. (BAA = biaryl angle between C₂-C₁-C₁'-C...

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Figure 5: X-ray structures of BIFOP(O)-H (8). Distances are given in Å. (BAA = biaryl angle between C₂-C₁-C₁'...

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Figure 6: X-ray structures of phosphite BIFOP-OPh (6). Distances are given in Å. (BAA = biaryl angle between C...

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Figure 7: X-ray structures of phosphoramidite BIFOP-NEt2 (7). Distances are given in Å. (BAA = biaryl angle b...

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Figure 8: X-ray structures of BIFOP(O)-Cl (9). Distances are given in Å. (BAA = biaryl angle between C₂-C₁-C₁...

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Scheme 4: Geometries of BIFOP-systems with respect to biaryl dihedral angles (C₂-C₁-C_1’-C_2’, BAA), fenchyl-ar...

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Figure 9: Computed geometry (PM3) of plus-(P)-BIFOP-Cl with unnatural plus-(P)-biaryl conformation. Distances...

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Scheme 5: Biphenyl-2,2'-bisfenchol based phosphanes (BIFOPs) as chiral ligands in enantioselective Cu-catalyz...

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Scheme 6: Anharmonic B3LYP/6-31G^*(C,H,N,O,F,Cl,Br) /SDD(Cu) CO-stretching frequencies to assess metal to liga...

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Published 26 Aug 2005

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