— 180 — 



Furthermore, benzaldehyde absorbs hydrogen persulphide (hydrodisul- 

 phide), forming dibenzaldisulphide hydrate (IV); with hydrotrisulphide, di- 

 benzaltrisulphide hydrate (V) is formed. Anisic aldehyde gives with hydro- 

 disulphide, dianisaldisulphide hydrate (VI) and with hydrotrisulphide, dianisal- 

 trisulphide hydrate (VII). The product of cinnamic aldehyde and hydro- 

 disulphide is dicinnamaldisulphide hydrate (VIII), and of cinnamic aldehyde 

 and hydrotrisulphide, dicinnamaltrisulphidehydrate (IX). 



I C 6 H 5 CSSH 



II HOQH4CSSH 



III CH 3 OC 6 H 4 CSSH 



IV C 6 H 5 CHOH • S • S • CHOH * C 6 H 5 



V C 6 H 5 CHOHSSSCHOHC 6 H 5 



VI CH 3 OC 6 H4CHOHS.SCHOHC6H 4 OCH3 



VII CH 3 OC 6 H 4 CHOHSSS*CHOH.C 6 H40CHs 



VIII C 6 H 5 CH:CHCHOH.SSXHOHCH:CHC 6 H5 



IX C 6 H 5 CH:CHCHOHSSSCHOHCH:CHC 6 H 5 . 



On the occurrence of a-/?-hexylene aldehyde, see p. 160. 

 For piperonylidene diacetate, see heliotropin, p. 137. 



Asarylic aldehyde. In a paper by R. Fabinyi and T. Szeki 1 ), further 

 particulars are given of certain interesting conversions of asarylic alde- 

 hyde, which may possibly be of service in the identification of this body, 

 which up to the present has only been discovered in calamus oil 2 ). When 

 the aldehyde is heated on the water bath with hydrochloric, acid of 25°/o, 

 it yields a triphenylmethane derivative, nonamethoxytriphenyl methane, a 

 body consisting of snow-white crystals, m. p. 184,5°. The action of con- 

 centrated nitric acid upon the solution in glacial acetic acid of this tri- 

 phenylmethane derivative gives rise to l,2,5-trimethoxy-4-nitrobenzene 

 (m. p. 130°), which is identical with the compound formerly obtained by 

 the same authors from asaronic acid by means of nitration 3 ). With bromine, 

 nonamethoxytriphenyl methane combines, under elimination of the molecule 

 of trimethoxy bromobenzene, into a tribromo additive compound of hexa- 

 methoxy diphenyl methane, a deep violet-blue body. The 1,2,5-trimethoxy- 

 4-bromobenzene (m. p. 54,5°), which has been generated as a by-product, 

 may be obtained more readily and in larger proportion from asaronic acid, 

 the compound may also be obtained by bromination from hydroxyhydro 

 quinone trimethyl ether. When the bromination process is continued, 



!) Berl. Berichte 43 (1910), 2676. 



2 ) Report April 1903, 14. 



3 ) Comp. Report April 1907, 157. 



