54.4 MM. Friedel and Krafts on Organic Silicon Compounds, 



ments on new organic compounds of silicon, which confirm the 

 modern views of the atomic weight of this substance. If H* = 2 

 volumes, 2 volumes of chloride of silicon contain CI 4 , or 142 of 

 chlorine combined with 28 of silicon. The formula of chloride 

 of silicon is thus Si CI 4 , that of anhydrous silicic acid Si 9* 2 , 

 while the normal hydrated silicic acid would have the formula 



W4 r ^ 4 * When silicic ether is heated with chloride of silicon in 



closed vessels to a temperature of 160°, a product is obtained 

 which does not fume in the air, and which distils in greatest 

 part between 152° and 158°. A portion of this obtained after 

 several fractional distillations, and whose boiling-point was 

 between 155° and 157°, gave analytical results agreeing with 

 the formula 



3€- 2 H 5 J° 3 ' 

 CI 



In this substance a quarter of the ethyle and a molecule of oxygen 

 have been replaced by an atom of chlorine, and the body is in 

 reality a monochlorhydrine of silicic ether. 



In the product of the above reaction a certain amount of sub- 

 stance was found distilling at a lower temperature and richer in 

 chlorine. Part of this, boiling between 133° and 140°, was 

 analysed ; and the results led the authors to the conclusion that 

 the liquid contains a considerable quantity of a dichlorhydrine, 



2€^H 5 T° 2 > boilin ° at 136 °' 

 CI 2 

 When the first of these compounds is heated with amylic 

 alcohol, hydrochloric acid gas is disengaged, the liquid becomes 

 heated, and distils almost entirely between 205° and 225°. The 

 part distilling between 216° and 225° gave, on analysis, numbers 

 agreeing exactly with the formula 



The authors describe the production of silicon-ethyle. When 

 chloride of silicon w T as mixed with zinc-ethyle no reaction took 

 place in the cold; but in a sealed tube it began at 14-0°, and 

 at 160° it was complete. On opening the tube, some quantity 

 of gas was liberated, while the liquid residue consisted of chloride 

 of silicon along with a liquid boiling at 153°. This liquid, boil- 

 ing at 153°, washed with water to remove a small quantity of 

 chloride of silicon, and redistilled, was found to be perfectly 



