The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《α-Bromo, and hydroxyaldehydes》. Authors are Dworzak, Rudolf; Pfifferling, Paula.The article about the compound:2-Bromopriopionaldehydediethylacetalcas:3400-55-3,SMILESS:CC(Br)C(OCC)OCC).COA of Formula: C7H15BrO2. Through the article, more information about this compound (cas:3400-55-3) is conveyed.
The action of 2 atoms Br upon (EtCHO)3 at-5° to-10° and treatment with EtOH gives about 30% MeCHBrCH(OEt)2 (I), b2 69° and about 15% of the dibromoacetal, together with considerable high-boiling material. The action of 4 atoms Br (320 g.) upon 58 g. (EtCHO)3 gives 20 g. pure I and 87 g. dibromoacetal (II), MeCBr2CH(OEt)2, b2 91°. The high-boiling fraction, B2-3 130°, analyzes for C8H15O2Br3, may be MeCHBrCHbRCMebrCH(OH)OEt. The action of 2 atoms Br upon 1 mol. C6H13CHO and treatment with EtOH gives 60% of a mixture of about 1 part α-bromoenanthole, b2 62° and about 2 parts of the acetal, b1 92°. Heating I with twice its weight of H2O a short time gives lactaldehyde, which may be extracted with Et2O after addition of a little alkali. It was identified as the osazone; the phenylhydrazone could not be obtained. II behaves similarly toward H2O, but the reaction is much slower; AcCHO was identified as the osasone, m. 145°. Similarly was prepared α-hydroxyenanthole, m. above 100° (not sharply), which is the dimeric form, as shown by mol. weight determinations
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Reference:
Piperazine – Wikipedia,
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