Diphenyl platinum chloride

The ligand 2-allylpyridine is reported to form chelate complexes with copper(I) chloride, silver nitrate and platinum(II) chloride (29). Diphenyl vinylphosphine also forms stable 1 1 and 2 1 adducts with silver nitrate in which both the phosphorous and the double bond are thought to be coordinated to silver (30). 

Adams platinum oxide catalyst is readily prepared from chloroplatinio acid or from ammonium chloroplatinate, and is employed for catalytio hydrogenation at pressures of one atmosphere to several atmospheres and from room temperature to about 90°. Reduction is usually carried out with rectified spirit or absolute alcohol as solvents. In some cases (e.g., the reduction of benzene, toluene, xylene, mesitylene, cymene and diphenyl ), the addition to the absolute alcohol solution of 2-5 per cent, of the volume of rectified spirit which has been saturated with hydrogen chloride increases the effectiveness of the catalyst under these conditions chlorobenzene, bromobenzene, o-, m- and p-bromotoluenes, p-dichloro- and p-dibromo-benzene are reduced completely but the halogens are simultaneously eliminated. Other solvents which are occasionally employed include glacial acetic acid, ethyl acetate, ethyl acetate with 17 per cent, acetic acid or 8 per cent, of alcohol. In the actual hydrogenation the platinum oxide Pt02,H20 is first reduced to an active form of finely-divided platinum, which is the real catalyst allowance must be made for the consumption of hydrogen in the process. 

Platinum-chiral bidentate ligand-tin(ll)chloride catalysts have been used in hydroformylation reactions. MeOBlPHEP, BlNAP-hemioxide, and diphosphites containing 2,4-pentanediyl and 1,3-diphenyl-1,3-propanediyl moieties have been used as a bidentate ligand (288). Pt-complexes with ferrocene-based chiral diphosphines have been screened in enantioselective hydroformylation of styrene (289). 

Cl bHi bC12Pc12, Bis(2-phenyl-7r-allylpalladium chloride), 34B, 444 ClbHiBCl2Pt, Dichloro(2,5-diphenyl-l,5-hexadiene)platinum(II), 46B, 846... 

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