Mechanisms and selectivities in the ortho photocycloaddition of ethenes to the benzene ring
โ Scribed by Andrew Gilbert; Paul Yianni
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- French
- Weight
- 234 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0040-4039
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## Abstract The photoreactions of the methylbenzonitriles; 2,3โ, 2,4โ, 2,6โ, 3,4โ, and 3,5โ benzonitriles; and 2โฒโ and 4โฒโ methoxyacetophenones with cyclopentene and ethyl vinyl ether have been investigated. __Meta__ photocycloaddition is the major process for the benzonitriles with cyclopentene, a
The 254 nm irradiation of benzene in the presence of ethylenes which have ionisation potentials less than ca. 9.1 e7 yields either exo and endo 1,3-cycloadducts (1) or a mixture of 1,2-( ) and ---
C(4), Cะ(2)-Double substitution was achieved in good yields by reacting 3-arylsydnones with BuLi and then with a suitable electrophile in THF at โซ05ืโฌะC. แญง 1998 John Wiley & Sons, Inc. Heteroatom Chem 9:549-552, 1998 1 H NMR d 7.41-7.52 (m, 20H, Ar-H), 7.76-7.84 (m, 3H, Ar-H); IR 1723 (m CO ) cm โซ1ื