Fischer, F. published the artcilePreparation and properties of mono- and dipinaconeboric acid, Category: alcohols-buliding-blocks, the publication is Zeitschrift fuer Chemie (1964), 4(8), 301-2, database is CAplus.
By repeating the preparation of monopinaconeboric acid (I) by Hermans (CA 19, 1386), I, m. 68-72°, was obtained only occasionally; most of the time a mixture, m. 60-180°, was formed which, recrystallized several times from petr. ether, gave dipinaconeboric acid (II), m. 218-25°. Some of the tautomeric forms are shown. Pinacone-6H2O (III) and 1.6-2 equivalents B(OH)3 (IV) as concentrated aqueous solutions mixed and evaporated in vacuo over concentrated H2SO4, and the residue extracted 8 hrs. with petr. ether gave I, readily soluble in H2O and most organic solvents. Similar runs with IV and 2.5 equivalents III yielded II, b. 280°, m. 219-21° (Bu2O), sparingly soluble in H2O and most organic solvents. II becomes moist and deliquesces on proplonged standing in air. II dissolved in H2O at room temperature within a few days (in 0.5 hr. at 100°) with decomposition to I, III, and IV. The infrared spectrum of I in CHCl3 indicates that it is in equilibrium with a dimer; the equilibrium is shifted towards the dimer with increasing concentration The infrared spectrum of II indicates the formation of an acid complex at concentrations above 0.0125M.
Zeitschrift fuer Chemie published new progress about 25240-59-9. 25240-59-9 belongs to alcohols-buliding-blocks, auxiliary class Boronic acid and ester,Boronic Acids,Boronate Esters, name is 4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-ol, and the molecular formula is C6H13BO3, Category: alcohols-buliding-blocks.
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