The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 2-Bromopriopionaldehydediethylacetal( cas:3400-55-3 ) is researched.Application of 3400-55-3.Migulin, Vasily A.; Krayushkin, Michael M.; Barachevsky, Valery A.; Kobeleva, Olga I.; Novikov, Valentin V.; Lyssenko, Konstantin A. published the article 《Synthesis and studies of symmetric dibenzothienylcyclopentenes》 about this compound( cas:3400-55-3 ) in Tetrahedron. Keywords: sym dibenzothienylcyclopentene photochromism crystal structure DFT. Let’s learn more about this compound (cas:3400-55-3).
Various sym. 5,5′-substituted dibenzo[b]thienylcyclopentenes were synthesized from the corresponding dibromide with a formation of new C-C, C-N, C-O, C-Si, and C-I bonds. The influence of the introduced substituent on the photochromic properties of the obtained compounds was systematically researched in both solution and solid state. The ratio of antiparallel and parallel conformers in solution was determined by NMR spectroscopy. Only one compound of the series-5,5′-diphenoxy-substituted-has displayed photochromism in the single crystal. High resolution x-ray diffraction showed that intermol. S···π and S···H contacts kept two benzothiophene rings together in the mol., hence decreasing the distance between the two reactive centers responsible for the photocyclization reaction. DFT calculations of the isolated mols. appeared to be in good agreement with the obtained x-ray diffraction data, and therefore could also essentially assist a researcher in the design of photochromic mols.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics