Synthesis of tricarbonylchromium complexes of 4-aryl-1,4-dihydropyridines
β Scribed by Adeleh Moshtaghi Zonouz, Mina Abkar Aras, Nasrin Abuali
- Book ID
- 120783523
- Publisher
- Springer
- Year
- 2013
- Tongue
- English
- Weight
- 253 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0340-4285
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## Abstract On irradiation in the solid state the 4βarylβ1,4βdihydroypridines 1 undergo [2+2] cycloadditon to centrosymmetric headβtoβtail dimers 3 and 4a. The almost exclusive formation of the cage dimers 3 __via__ the C~2~βsymmetric __syn__βdimers 2 takes place in nearly quantitative yields, in c
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