Keywords
Cyclization
macrocycle
pyrimidinophane
sulfonium salts
uracil
Abstract
The cyclization of 1,3-bis(ω-bromoalkyl)uracils with sodium sulfide led to pyrimidinophanes, containing one uracil unit and an S atom in the spacer, macrocyclic structure was confirmed by X-ray data; the S atom in bridge can be oxidized into sulfoxide or sulfone or converted into sulfonium ion.
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