The Claisen rearrangement of some allyl naphthalen-1-yl ethers has been examined, together with methods for modification of the resulting 2-ally1 side chain. Isomerization of the C-allyl substituent to a prop-1-enyl group followed by ozonolysis gives a formyl derivative, while ozonolysis of a 2-(2-methylprop-2-enyl) moiety or mercuriation of a 2-(2-chloroprop-2-enyl) substituent leads to an acetonyl derivative. Treatment of phenols with iodine(I) acetate and an excess of silver(I) acetate gives 4-hydroxyaryl acetates, probably via dienone intermediates.

No abstract

A study has been made of the effect of nickel content on the surface area of the metal and on the kinetics of the hydrogenation of benzene to cyclohexane for five coprecipitated nickel alumina catalysts containing 5.4-75-0 wt % nickel. From a study of the hydrogen adsorption isotherms in the temperature range from -196 to 5 5 T it was assumed the surface of the metal was saturated with dissociatively adsorbed hydrogen at ambient temperature. The specific activity, i.e., the reaction rate per unit area of nickel, the apparent activation energy, and the reaction orders were measured in the temperature range 0-70°C in a differential flow reactor. The orders of reaction were approximately zero with respect to benzene and 0.6 with respect to hydrogen. Cyclohexene was not detected in the effluent gases. The specific activity, apparent activation energy, and preexponential factor for the catalysts were essentially the same. The results are in general agreement with those reported for an evaporated nickel f i l m .

A study has been made of the reaction of n-butane with steam at a total pressure of 30 atm in the temperature range 425-475°C over a co-precipitated nickel-alumina catalyst. The main object was to elucidate the primary and secondary reactions of the process. The reaction products, viz., methane, hydrogen, carbon monoxide, carbon dioxide and water, were at equilibrium at all conversions of the butane. The order of reaction was zero with respect to butane and approximtely first with respect to water. The rate-determining step involved the initial reaction of the butane with steam.

With iodine(!) a i d e or iodine(1) chloride norcarane gives products of ring opening as well as those of fragmentation followed by addition. Reactions of norborn-2-ene with iodine(!) azide under conditions which favour either an ionic or a radical path have also been examined.