Pryor

W. A. Pryor, ed.. Organic Eree Radicals, A.CS Symposium Series 69, American Chemical Society, Washington, D.C., 1978 J. M. Hay, Keactive Free Radicals, Academic Press, Inc., New York, 1974. 

W. A. Pryor, Free Radicals in Biology, Academic Press, Inc., New York, 1976, Chapt. 1. 

Benzoyl suinde [644-32-6] M 174.4, m 131.2-132.3 . About 300mL of solvent was blown off from a filtered soln of benzoyl disulfide (25g) in acetone (350mL). The remaining acetone was decanted from the solid which was recrystd first from 300mL of 1 1 (v/v) EtOH/ethyl acetate, then from 300mL of EtOH, and finally from 240mL of 1 1 (v/v) EtOH/ethyl acetate. Yield about 40% [Pryor and Pickering J Am Chem Soc 84 2705 7962]. Handle in a fume cupboard because o/TOXICITY and obnoxious odour. 

Grateful thanks are due to Dr. W. B. Jepson, Dr. M. Pryor and Mr. J. N. Wanklyn for helpful discussions during the preparation of this Appendix. 

Dr. Pryor considers that in certain cases of uniform dissolution of metals in acids (e.g. AI in hydrochloric or sulphuric acid) or alkalis a thin him of oxide is present on the metal surface — the him is not rate-determining but its presence would indicate that reactions of this type should be classified under 2 (c). 

Fig. 1.63 Effect of stirring rate on the aluminium-mild steel couple in 1 - 0 n NaCl at 25°C. Equal areas (20 cm ) of aluminium and steel coupled together for 24 h (after Pryor and...

Accordingly, a bare copper surface is soon presented to the electrolyte. Aluminium, on the other hand, maintains an oxide-covered surface under these conditions, and it is evident from Fig. 1.64, which is constructed from the work of Pryor and Keir , that the reduction of dissolved oxygen is highly polarised and severely limits the galvanic current flow. Aluminium is... 

Fig. 1.64 Polarisation curves for zinc anodes coupled to aluminium and copper cathodes in I.On NaCI at 25°C (potentials vs. S.H.E.) (after Pryor and Kier - )...

Fig. 1.65 Potential/time curves for cathodically polarised and unpolarised iron in 1 0 n NaCl at 25 C. Curve a unpolarised Fe curve b Fe polarised cathodically at 20 nA/cm, pFt = 6 2 curve c Fe polarised cathodically at 20/iA/cm, pFt = 8-9 and curve d Fe polarised cathodically at 40/iA/cm, pFt = 6-2 (potentials vs. S.H.E.) (after Pryor )...

Similar effects to those shown in Fig. 1.65 have been observed by Pryor and Keir in certain bimetallic couples having steel cathodes. Figure 1.66... 

Fig. 1.67 Effect of mild-steel cathode on the weight loss of aluminium and zinc anodes (100 cm area) and on the number of coulombs flowing in the aluminium-mild steel and zinc-mild steel couples over a 96 h period in 1 -0 n NaCl at 25°C (after Pryor and Keir )...

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