Phosphines Schiff bases

Rhenium(IV) complexes with only one bidentate ligand have been described for chelating phosphines, Schiff bases, and A-heterocycles. The synthetic approaches are different and involve simple ligand exchange procedures as well as reduction of rhenium(V) or oxidation of rhe-nium(III) compounds. 

Jiang J-J, Huang J, Wang D, Yuan Z-L, Zhao M-X, Wang F-J, Shi M. Cu(I)-catalyzed asymmetric chlorination of (3-ketoesters in the presence of chiral phosphine-Schiff base type ligands. Chirality 2011 23(3) 272-276. 

Kawatsura/ltoh et al. s Co(II)-salen complex Cll with TfCl/4AMS (Table 43.3, entry 1), Feng et al. s N,N -oxide C12 with NCS (Table 43.3, entry 2), Diaz-de-Villegas/Galvez et al. s chiral amine catalyst C13 with NCS (Table 43.3, entry 3), and Shi et al. s chiral phosphine-Schiff base type Cu(I) catalyst C14 with NCS (Table 43.3, entry 4). ... 

A phosphine-Schiff base ligand (17) has been used for copper-catalysed asymmetric conjugate addition of diethylzinc to various ( )-alkenyl aryl ketones where the aryl ring is either a phenyl group substituted by nitro, chloro, or methoxy groups or not substituted or a naphthyl group. When the conjugate addition has been performed in ethyl acetate... 

Rhodium complexes with oxygen ligands, not nearly as numerous as those with amine and phosphine complexes, do, however, exist. A variety of compounds are known, iucluding [Rh(ox)3] [18307-26-1], [Rh(acac)3] [14284-92-5], the hexaaqua ion [Rh(OH2)3] [16920-31 -3], and Schiff base complexes. Soluble rhodium sulfate, Rh2(804 )3-a H2 0, exists iu a yellow form [15274-75-6], which probably coutaius [Rh(H20)3], and a red form [15274-78-9], which contains coordinated sulfate (125). The stmcture of the soluble nitrate [Rh(N03)3 2H20 [10139-58-9] is also complex (126). Another... 

Calcium-binding proteins, 6, 564, 572, 596 intestinal, 6, 576 structure, 6, 573 Calcium carbonate calcium deposition as, 6, 597 Calcium complexes acetylacetone, 2, 372 amides, 2,164 amino acids, 3, 33 arsine oxides, 3, 9 biology, 6, 549 bipyridyl, 3, 13 crown ethers, 3, 39 dimethylphthalate, 3, 16 enzyme stabilization, 6, 549 hydrates, 3, 7 ionophores, 3, 66 malonic acid, 2, 444 peptides, 3, 33 phosphines, 3, 9 phthalocyanines, 2,863 porphyrins, 2, 820 proteins, 2, 770 pyridine oxide, 3,9 Schiff bases, 3, 29 urea, 3, 9... 

Butyne-l,4-diol has been hydrogenated to the 2-butene-diol (97), mesityl oxide to methylisobutylketone (98), and epoxides to alcohols (98a). The rhodium complex and a related solvated complex, RhCl(solvent)(dppb), where dppb = l,4-bis(diphenylphosphino)butane, have been used to hydrogenate the ketone group in pyruvates to give lactates (99) [Eq. (15)], and in situ catalysts formed from rhodium(I) precursors with phosphines can also catalyze the hydrogenation of the imine bond in Schiff bases (100) (see also Section III,A,3). 

Numerous other complexes of beryllium with organic ligands such as alloxides (276-280), /6-diketonates (90, 281-297), SchifF bases (64, 298-301), thiols (302), pyridines (303), bipyridyl (304), phthalocya-nine (305), hydroxyquinolines (306, 307), tropolones (308, 309), pyra-zolylborates, (94, 310), phosphinates (311), hydrazides (312), phenyl-hydrazonocarboxylates (313), dinaphthofuchsonedicarboxylates (314),... 

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