75148-49-1, Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 75148-49-1, name is 3-Bromobenzaldehyde Diethyl Acetal, This compound has unique chemical properties. The synthetic route is as follows.
General procedure: One equiv. of protected hydrazine was dissolved/suspended in EtOH containing 10% water (approx. 5 ml per 1 mmol of protected hydrazine), 1.05 eq of benzaldehyde acetal was added, followed by the addition of 0.05 equiv. of TsOH in an ethanolic solution (10 mg of TsOH per 0.5 ml of EtOH). The obtained reaction mixture was refluxed and monitored by TLC (silica gel) until full conversion of the starting material was observed. Ethyl acetate/light petroleum mixtures or pure ethyl acetate were used as TLC eluents. After completion of the reaction the solvent was removed under reduced pressure, approx. 15 ml of toluene was added to the residue and the solvent was again removed under reduced pressure. The obtained crude hydrazone was dissolved in commercial stabilized THF (approx. 4 ml per 1mmol of hydrazone), the flask was flushed with argon and 3 equiv. of 1M BH3-THF complex was added at room temperature, followed by 3 hours of stirring. The progress of the reaction was checked by TLC and if some unreacted hydrazone was left, stirring was continued for an additional 45 min. After thefull conversion of hydrazone EtOH (10 ml) was added to the reaction mixture (Caution: Liberation of hydrogen) and the obtained mixture was refluxed for 1 hour. After cooling to room temperature the solvent was removed under reduced pressure and the residue was dissolved in ethyl acetate, washed with saturated NaHCO3 solution, water and saturated NaCl solution. The aqueous phase was extracted twice with ethyl acetate, the extracts were washed with saturated NaCl solution, combined with the organic phase, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by column chromatography on silica gel by using ethyl acetate/light petroleum 1:1 or 1:2 mixtures or pure ethyl acetate as eluent. For the exact information about the eluent used for monitoring reaction progress and chromatographic purifications, see the Rf value for each compound.
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Reference:
Article; Mastitski, Anton; Niinepuu, Siret; Haljasorg, Toiv; Jaerv, Jaak; Organic Preparations and Procedures International; vol. 50; 4; (2018); p. 416 – 423;,
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