The reaction between titanium tetrachloride and ammonia has been investigated tensimetrically a t temperatures between -36" and -6 3 O , and explained by the formation of amidochlorides, e.g., Ti(NH,) ,C1. Thermal decomposition of the products in vacuum a t 350" gave TiNCl.An improved apparatus is described for the study of reactions in liquid ammonia.
By R. F. MOORE and WILLIAM A. WATERS.A KINETIC study (Part I11 *) indicated that when 3 : 5 : 3' : 5'-tetramethyl-4 : 4'-diphenoquinone is used as a retarder of the benzoyl peroxide-catalysed autoxidation of benzaldehyde it acts by combining with the free benzoyl radical, C,H,*CO*, probably to form 4 : 4'-dibenzoyloxy-3 : 5 : 3' : 5'-tetramethyldiphenyl. However, the true location of the added benzoyl group cannot be deduced by kinetic methods and the direct isolation of the chain-ending product was therefore undertaken. The dibenzoate has in fact been isolated but, as pure product, in the yield of 5% only. There was also produced a considerable quantity of a yellowish amorphous powder of indefinite m. p. (140-190") which could not be purified. I t would seem therefore that the kinetic analysis of this retarded autoxidation leads to a representation which very much simplifies the organic chemistry of the whole processes, and it may be recalled that a similar impression of the validity of kinetic study alone has previously been reached from studies of the retardation of benzaldehyde autoxidation by phenols (compare Parts I and 11,
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