Hirotsugu Sato, S. Sugawara
1985
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Journal
Nippon Kagaku Kaishi
Abstract
Three kinds of diazonium tetraphenylborates (diazo TPB) were synthesized and their thermal stability was investigated. Thermal stability of 2, 5-dibutoxy-4-morpholinobenzenediazonium TPB was found to be high. Two salts, 2, 5-diethoxy-4-(4-methoxybenzoylamino)benzenediazonium TPB and 2, 5-diethoxy-4-(p-tolylthio)benzenediazonium TPB, were thermolabile and tarry matter was produced from them after a week of storage. The thermolability was dependent on the mixing ratio between aqueous solution of diazoniun zinc chloride and sodium TPB solution, and on the storage condition of the precipitate. Needle-like crystals were produced from the tarry matter of diazo TPB and it was identified with phenylboronic acid. The thermal decomposition occurs via the decomposition of TPB anion.