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Abstract. Chloro(triphenylphosphine)gold(I), (C6Hs)3PAuCI, prepared by reacting triphenylphosphine with chloroauric acid in alcohol, crystallizes in the orthorhombic space group P212~2~ with a= 12-300 (4), b= 13.084 (4), and c=10.170 (3) A; De= 1-991, Dm=l'97 g cm -3, Z=4, R2=0.037 based on 2109 reflections collected on a four-circle automated diffractometer. The molecule is linear with the goldphosphorus distance equal to 2.235 (3) A and the goldchlorine distance equal to 2.279 (3) A.

Structures of Carbides, Nitrides and Oxides of Uranium 99 passed through the reactor at 235°. The effluent gaseous products of the reaction were found to be as follows Propylene Per cent.

The reaction between trifluoromethylcadmium reagent and Br2Cu(edtc) (edtc = N,N-diethyldithiocarbamato) or Cdl+[(CF3)2Cu]-with [Et2NC(S)S]2 in DMF (dimethylformamide) at -30 "C yields the stable Culll perfluoroalkylcopper complex, (CF&CuSC(S)NEt2.Perfluoroalkylcopper reagents exhibit excellent thermal stability compared to their hydrocarbon analogues and have consequently received extensive utilization in preparative organic chemistry ,1,2 but their composition and structure is not clearly defined. Perfluoro-t-butylcopper has been described as a 2 : 3 dioxane adduct, but no structural data was provided.3 Except for the recent proposal of [CF~CUII-by Chambers ,4 these reagents have been formally represented as RFCu or RFCu.CuI.l Our recent report2 that multiple trifluoromethylcopper species, with significantly different physical and chemical properties, can be detected spectroscopically suggested that this formalism for perfluoroalkylcopper reagents is oversimplified. Thus, we have focused on the identification and composition of these different trifluoromethylcopper moieties to better understand the nature of these reagents.Recent developments in the 'CF3Cu' system have demon-strated5 that two of these compounds are CF3Cu.L (1) (L = metal halide) and the cuprate CdI+[(CF3)2Cu]-(2). In contrast to the slow oxidation of (I), the cuprate (2) is readily oxidized by a variety of oxidants. For example, oxidation with thiuramdisulphide converts (2) to (CF3)2CuII*edtc (edtc = N,N-diethyldithiocarbamato) (3), the first stable trifluoromethyl Cu"1 compound (Scheme 1

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