期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2006, 期 16, 页码 3575-3581出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200600232
关键词
alkynes; catalysis; cyclophanes; cyclotrimerization; rhodium
Cross-cyclotrimerizations of ether-linked alpha,omega-diynes and dimethyl acetylenedicarboxylate in the presence of a catalytic amount of cationic rhodium(I)/H-8-BINAP complex give [7][21]polyether cyclophanes in good yield. [8]-[9]Ester cyclophanes were also synthesized from the corresponding alpha,omega-diynes. The ratio of para-, meta-, and orthocyclophanes depends on the length and the structure of the alpha,omega-diyne tether chain, whilst the effect of concentration on the yield of polyether cyclophanes appears to be small. X-ray analysis revealed that a single crystal of 115]metacyclophane 4g was the chiral form and that of [5.5]metacyclophane 4k the racemic form, due to an absence of ring flip in the crystals. (c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据