By W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)
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Extra info for Advances in Catalysis, Vol. 6
Example text
Such protection by extremely thin barriers is of obvious importance in fields as far apart as corrosion and biology. 10. Cis double bonds never pack perfectly, but trans compounds fit closely together. If, by any means, the tightness of packing be altered, the rate constant will faithfully reflect it. One way of accomplishing such alteration is by modifying the configuration about the double bond. I n general, as with oleic acid, the packing of chains with cis double bonds is never perfect, while the trans compounds, on the other hand, fit together very closely (Fig.
Compression of the film will naturally alter the spacing between these essential points of attachment, while a t still higher pressures the double bonds, just a s in the case of oleic acid, will be lifted out of the aqueous interface. Hughes suggested that the active component in the venoms must also embody two active groups, whose spacing must coincide with that of the two active groups in the distended lecithin molecule before the hydrolysis can occur. 6. Electrical charge effects are undoubtedly important in the kinetics of the reaction.
9. The rate of attack of permanganate on the double bonds of oleic acid is less when II is high enough to force some of them off the aqueous surfaces (Hughes and Rideal, 15). 003% permanganate in N/100 HzSOd. from the aqueous phase by a layer of hydrocarbon. As predicted the rate found is now very small (Fig. 9). It is important to notice that the double bonds and the permanganate are separated by a layer of hydrocarbon only about 10 A. thick, which, because of the orientation of the monolayer, the permanganate ions cannot break through.
