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Encyclopedia Britannica



C2I15

This article appears in Volume V04, Page 268 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BUN-CAL
C2I15 as a colourless spontaneously inflammable gas of unbearable smell.
Boron
  triethyl B(C2H5)3 is obtained in the same manner, by using zinc
ethyl
 . It is a colourless
spontaneously inflammable liquid of boiling point 95 C. By the action of one molecule of
ethyl
  borate on two molecules of zinc ethyl, the compound B(C2H3)2.002I-I5 diethylboron ethoxide is obtained as a colourless liquid boiling at 'of C. By the action of water it is converted into B(C2H5)2.OH, and this latter compound on exposure to air takes up oxygen slowly, forming the compound BC2H5.002H5.OH, which, with water, gives B(C2Hz)(OH)2. From the condensation of two molecules of ethyl borate with one molecule of zinc ethyl the compound B2C2H5. (OC2H5)5 is obtained as a colour-less liquid of boiling point 112 C.
Boron
  triethyl and boron trimethyl both combine with ammonia.
The atomic weight of boron has been determined by estimating the water content of pure borax (J.
Berzelius
 ), also by conversion of anhydrous borax into sodium chloride (W. Ramsay and E.
Aston
 ) and from
analysis
  of the bromide and chloride(Sainte-Claire Deville) ; the values obtained ranging from 10.73 to 11.04. Boron can be estimated by precipitation as potassium fluoborate, which is insoluble in a mixture of potassium acetate and alcohol. For this purpose only boric acid or its potassium
salt
  must be present; and to ensure this, the borate can be distilled with sulphuric acid and methyl alcohol and the volatile ester absorbed in potash.


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