Proceedings of the American Association for the Advancement of Science Volume 31 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ...on the a phenyltribrompropionic acid has been described by one of us in the American Chemical Journal for April. Since that time the study of the /? acid has engaged our attention. This acid is obtained by the action of bromine on monobromcinnamic acid, and is a crystalline solid soluble in alcohol, ether, bisulphide of carbon and chloroform. Its melting point is 151 C. and not 48 C. as given by Glaser (Ann. 143, P. 339), nor does it first separate out as an oil. The acid obtained by Glaser was evidently an impure substance. On boiling with water the acid is decomposed, a bibromstyrol, whose structure we have not as yet determined, and the a monobromcinnamic acid being formed; also a small quantity of a new acid, very soluble in water, melting at 184, which on analysis gave amounts of carbon, hydrogen, and bromine, corresponding very closely to what would be obtained if the substance was a phenylbibromlactic acid. The formation of the same a monobromcinnamic acid, from both the a and ft phenyltribrompropionic acid is not easily explained. It is probably caused by a change of position of the atoms within the molecule at the moment of its formation. We are at present engaged on a further study of the above reaction, together with the products formed by the action of chlorine on both the a and ft monobromcinnamic acids. Chemical Laboratory, Harvard University. The Action Of Baric Hydrate On Chlortribrompropionic Acid. By C. F. Mabery and Ralph Wilson, of Cambridge, Mass. ABSTRACT. In a previous paper by H. C. Weber and one of us, it was stated that chlortribrompropionic acid was decomposed when heated with baric hydrate. The products of this decomposition were not sufficiently studied to enable us to characterize them with any degree of accuracy, although the ...