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C2I15

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Originally appearing in Volume V04, Page 268 of the 1911 Encyclopedia Britannica.
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C2I15 as a colourless spontaneously inflammable See also:

gas of unbearable See also:smell. See also:Boron triethyl B(C2H5)3 is obtained in the same manner, by using See also:zinc See also:ethyl. It is a colourless spontaneously inflammable liquid of boiling point 95° C. By the See also:action of one See also:molecule of ethyl borate on two molecules of zinc ethyl, the See also:compound B(See also:C2H3)2.002I-I5 diethylboron ethoxide is obtained as a colourless liquid boiling at 'of C. By the action of See also:water it is converted into B(C2H5)2.OH, and this latter compound on exposure to See also:air takes up See also:oxygen slowly, forming the compound B•C2H5.002H5.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 B2•C2H5. (OC2H5)5 is obtained as a See also:colour-less liquid of boiling point 112° C. Boron triethyl and boron trimethyl both combine with See also:ammonia. The atomic See also:weight of boron has been determined by estimating the water content of pure See also:borax (J. See also:Berzelius), also by See also:conversion of anhydrous borax into See also:sodium chloride (W. See also:Ramsay and E. See also:Aston) and from See also: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 See also:

potassium fluoborate, which is insoluble in a mixture of potassium acetate and See also:alcohol. For this purpose only boric See also:acid or its potassium See also:salt must be See also:present; and to ensure this, the borate can be distilled with sulphuric acid and methyl alcohol and the volatile ester absorbed in potash.

End of Article: C2I15

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