Selective preparation. 30. A convenient preparation of 5, 13-di-tert-butyl-8, 16-disubstituted-[2.2] metacyclophanes and their trans-tert-butylation and halogenation …
M Tashiro, T Yamato
Index: Tashiro, Masashi; Yamato, Takehiko Journal of Organic Chemistry, 1981 , vol. 46, # 8 p. 1543 - 1552
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Citation Number: 99
Abstract
(28a) in good yield. However, the similar reaction of diethyl derivative 16c gave only a complex mixture of products. Treatment of 16b and 28a with NBS in CCl, afforded the corresponding dibromides 38 and 39 in 86% and 95% yields, respectively. The bromination of 16b and 16c with bromine in CCl, afforded the corresponding anti-
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