664 



REPORT — IBS'; 



Both sodium chloride and bromiJe were found in the residue in the flask. 

 Trimethylenesiliconoxide, OjTIg.SiO. 



I "\ 



CH, SiO 



I / 

 CH, 



This was obtained by exposing a portion of the previous compound to the air, 

 upon which it became solid and now insoluble in benzene, ether, &c. It was 

 washed with benzene and dried in vacuo over sulphuric acid. The substance had 

 HOW a dark appearance, and being insoluble in the usual solvents, was analysed 

 without further purification. 



0-2025 gr. subst. gave 0-1415 gr. SiO. = 32Gl % Si 



Found. Calc. for. CsHg.SiO 



3261 % Si 32-67 % Si 



The action of silicon tetrachloride on aromatic di-halogen derivatives was now 

 tried, and for this purpose the ortho compounds seemed theoretically to offer the 

 most satisfactory results. 



Di-o-Dip/ieni/leiisilicium, (OgH^),^Si. 



CXI en 



HO 



lie 



CII 



For the preparation of this, 10 



C 



'.e e 



en 



CH 



CH 



. . jrs. SiCl^ (1 mol.) were mixed with 17-2 grs. 



<eij 

 Qj (2 mols.) and the mixture diluted with ether. 10-8 grs. of sodium 



(4 mols.) in fine condition were now added, and the reaction started with a i^:^' 

 drops of acetic ether. A violent reaction at once began so as to require cooling of 

 the flask. At the conclusion, the flask was warmed on the water-bath. After 

 cooling the liquid portion was filtered off', tlie residue on filter being washed with 

 ether. This ether was now removed by distillation and the residual liquid treated 

 with excess of water. A greyish-black substance separated out which was 

 extracted with ether. This etliereal solution was now evaporated on the watev- 

 bath, whereby a thick brown oil was obtained, which solidified on cooling. The 

 ■■solid substance was now digested with hot benzene, in order to free it from a dark 

 coloured body. The residue, dried in vacuo over sulphuric acid, was a dark brown 

 solid. 



A silicon determination was made by heating the powdered substance with 

 fuming nitric acid to 130° in a sealed tube. 



0-142 sfr. subst. gave 0-0475 SiO^^ 15-61 9^ Si 

 Found. Calc. for. (e,,H,)2 Si 



15-61% Si 15-55 % Si. 



The reaction may be represented : — 



2e,H,ei, + Siei, + 4Na, = (e JI,)„Si + SNaCl. 



Action of Sodium Amalgmn 07i ( CgH^)., Si. 

 On heating this substance with sodium amalgam in dilute alcoholic solution a 

 curious result was observed. After about an hour, a semi-solid substance separated 

 out, which dissolved on further heating. The liquid was now poured ofl', and a 



