✍ Scribed by Ashraf A Aly
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Reaction of 4-arylidene-2-phenyl-5(4H)-1,3-oxazolones with benzyne afforded predominantly, 3-arylidene-7-hydroxy-7phenyl-1,4(H)-benzoxazepine-2-ones in addition to their N-phenyl derivatives. However, the reaction of the target oxazolones with an excess of benzyne gave only the N-phenyl derivatives of 1,4(H)-benzoxazepine-2-ones in good yields. The reaction mechanism describing product formation is also explained. Arylation of 1,4(H)-benzoxazepine-2-ones with benzyne proceeded successfully to give the N-phenyl products.
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## Abstract The efficient synthesis of 4‐arylidene‐2‐phenyl‐1__H__‐imidazol‐5(4__H__)‐ones was achieved via microwave‐assisted reactions of 4‐arylmethylene‐2‐phenyloxazol‐5(4__H__)‐ones with urea in glycol. This approach provides a facile shortcut for the synthesis of this type of compounds with sh
## Abstract An (__E__)/(__Z)__ mixture (3 : 2) of 7‐benzylidenecycloocta‐1,3,5‐triene (**5**) is obtained when 1‐benzylcycloocta‐1,3,5,7‐tetraene (**7**), prepared by an improved procedure, is treated with __t__‐BuOK in THF. Alternatively, a __ca.__ 9 : 1 mixture (__E__)/(__Z__)‐**5** can be prepar