Abstract: The first representatives of Grignard reagents with intramolecular crown ether coordination, 2-(bromomagnesia)-1, 3-xylyl-l5-crown-4 (1) and 2-(bromomagnesio)-l, 3-xylyl- 18-crown-5 (2), were obtained by reaction of the corresponding crown ether aryl bromides 3 and 4 in 80 and 16% yield, respectively. During this reaction, a unique and highly specific cleavage of the crown ether ring occurred as an important side reaction. The reaction ...
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