704 REPORT — 1900. 



This acid dissolves with evolution of heat in conceutrated sulphuric acid, and on 

 diluting the solution with water a new acid is precipitated which was found to be 

 benzo-y-pyrone carboxylic acid — 



COOII . C = CII— CO 



i I 



- CJI, 



On distillation in vacuo this broke up with the evolution of carbon dioxide, and a 

 liquid distilled over which slowly solidified. It crystallised from a mixture of 

 benzene and ligroin in flat needles which melted at 59°, and analysis showed it to 

 be benzo-y-pyrone. The yellowish solution of beuzo-y-pyrone in concentrated 

 sulphuric acid possesses a violet fluorescence. 



14. On the Combination of Thiophenol and Guaiacol tvith the Esters of 

 the Acids of the Acetylene Series. By Dr. S. Ruhemann and H. E. 

 Btapleton, B.A. (Oxon.) 



In this paper an account is given of the contini'ation of previous work on the 

 combination of phenols witli the esters of the acetylene acids. The authors were 

 induced to study the action of thiophenol on these esters in the hope of finding a 

 new method of preparing thioacetophenone, whilst the investigation of guaiacol 

 was taken up, as no derivative of a diliydric phenol had previously been worked 

 with. 



During the progress of the research various new derivatives of thiophenyl- 

 cinnamlc, fumaric, and succinic acids were discovered, but it was found that 

 thiophenyl styrene 



0,^5.0 = CII^ 



S.OA 



on boiling with dilute mineral acids is decomposed into acetophenone and 

 hiopheuol, and not into thioacetophenone and phejiol, as had been expected. 



Guaiacol was found to combine readily with phenyl propiolic ester; guaiacolyl 

 cinnamic acid and its ester were prepared, and it was found that the acid on 

 heating quantitatively decomposed into carbon dioxide and guaiacolyl styrene — 



C,H-.C = CH, 



O.CH.O.CH 



s 



From the latter mineral acids regenerated guaiacol, with the additional formation 

 of acetophenone. 



15. CMorination of Aromatic Hydrocarhons. 

 By H. D. DAKiN,a«<f J, B. Cohen, ?h.D. 



TUESDAY, SEPTEMBER 11. 

 Ths Section was divided into two Departments. 



The following Papers were read : — 



Departjiext I. 



1. On some Recent Work on the Diffusion of Gases drid Liquids, 

 By HoKACE T. Bboavn, F.'H.S, 



