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Heating of white phosphorus, phosphorus trichloride, and cyclopentene at 220 "C gives trans-I ,2bis(dich1orophosphino)cyclopentane ( I ) , which with phenylmagnesium bromide gives trans-l,2-bis(diphenylphosphino)cyclopentane (dpcp) (2); compound (2) forms the adduct Ni(dpcp) Br2.CH2C12, which readily crystallises as a conglomerate and the pure eqantiomers may be separated by hand allowing resolution of (2), and catalytic hydrogenation of methyl(N-benzoy1)dehydrophenylalanine using resolved (2) and a rhodium catalyst gave a hydrogenated product of 100% optical purity.-179 + 4".

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The kinetics of the oxidation of electrochemically generated Fe(II) and Cu(I) by H2O2 in 2.0MnormalHCl has been studied with a platinum rotating ring disk electrode over a range of concentrations and temperatures. The data have been analyzed with a digital simulation technique to give values of k1 the rate constant for the rate‐determining initial step in the oxidation. The value in the case of Fe(II) is false(2.2±0.5false)×102M−1 sec−1 at 25°C, considerably larger than the literature values of this reaction. Possible reasons for this discrepancy both in the experimental results and in the simulation technique are discussed. For the Cu(I) reaction, 102k1=1.5,2.6,normaland 4.0M−1 sec−1 , at 15°, 25°, and 35°C, respectively, giving an activation energy of 8.5 kcal. These are the first reported values for k1 for the Cu(I) reaction.