On irradiation at Ξ» Υ 270 nm solutions of 4-aryl-1,4-Irradiation with filtered light (Ξ» ΟΎ 313 nm) leads to syn and anti dimers 4 and 3 in nearly equal yields. The poor yields of dihydropyridines 1 yield cage dimers 2 as the main products beside small amounts of anti dimers 3. 1 H-NMR data and X-anti
ChemInform Abstract: Novel Solid-State Synthesis of Dimeric 4-Aryl-1,4-dihydropyridines.
β Scribed by A. HILGEROTH; F. W. HEINEMANN
- Publisher
- John Wiley and Sons
- Year
- 2010
- Weight
- 31 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0931-7597
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β¦ Synopsis
Novel Solid-State Synthesis of Dimeric 4-Aryl-1,4-dihydropyridines. -On irradiation in the solid state, 4-aryldihydropyridines (I) and (IV) undergo [2 + 2] cycloaddition to centrosymmetric head-to-tail dimers (II) and (V), respectively. Further irradiation of the dimers (II) provides the cage dimers (III) by reaction of the remaining neighboring double bonds. Contrary, photoadduct (V) remains stable on further irradiation. -(HILGEROTH, A.;
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