Sodium tetraphenylboranate

Sodium tetraphenylboranate reacts with triethylalane in the same manner (126, 138). Also organospiroalanates can be made by alkyl exchange as shown in the following equation (144,145). 

Ammonium tetraphenylborate [14637-34-4] M 337.3, m ca 220"(dec). Dissolve it in aqueous Me2CO and allow crystallisation to proceed slowly otherwise very small crystals are formed. No trace of Me2CO is left in the crystals after drying at 120° [Davies Staveley Trans Faraday Soc 53 19 1957]. Also, the salt can be precipitated from a dilute AcOH solution of sodium tetraphenylborane in the presence of NH ions. After standing for 5 minutes, the precipitate is filtered off onto a sintered porcelain cmcible, washed with very dilute AcOH and dried at room temperature for at least 24 hours [Vendlandt.4na/ Chem 28 1001 1956]. Alternatively, a solution of sodium tetraphenylborane (5% excess) in H2O is added to NH4CI solution. After 5 minutes the precipitate is collected, washed several times with H2O and recrystallised from aqueous Me2CO. [Howick Vf)mm.Analyt ChimActa 19 342 1958, Beilstein 16 IV 1625.]... 

General Method of Detection of Amino Compounds with Sodium Tetraphenylboranate... 

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