Cutler, A.; Raghu, S.; Rosenblum, M. published an article about the compound: 2-Bromopriopionaldehydediethylacetal( cas:3400-55-3,SMILESS:CC(Br)C(OCC)OCC ).Name: 2-Bromopriopionaldehydediethylacetal. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:3400-55-3) through the article.
Metalation of β-haloacetals with Na dicarbonyl-h5-cyclopentadienylferrate (Fp-) gives aldehyde-Fe complexes (FpCHRCHO) and of h2-vinyl alc. and vinyl ether cations [Fp(CH2:CHOR)]+. These latter complexes are distorted dihapto cations. Treatment of FpCOCH2OMe with strong acid leads to the ketene hemiacetal cation [Fp(CH2:C(OH)OMe)]+, rather than to the expected ketene complex, which as well as the acetal cation [Fp(CH2:C(OMe)OEt)]+ prepared by alkylation of FpCH2CO2Me, has the structure of an h1-metal complex incorporating a carboxonium ion. A correlation exists between the chem. shift of cyclopentadienyl protons and the average ir carbonyl stretching frequency in a variety of Fp(olefin)+ and Fp-R complexes.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics