A versatile synthetic route to dehydrobenzoannulenes via in situ generation of reactive alkynes
摘要:
This paper outlines the development of a protocol that allows in situ generation of unstable alkynes under Pd-catalyzed cross-coupling conditions. Cu-mediated intramolecular cyclization of the resultant alpha,omega -polyynes provides dehydrobenzoannulenes as singular species, in very good overall yields, and in a variety of topologies that are inaccessible by traditional routes or previously available in low yield only. In addition, we will discuss the solid-state structure and reactivity of these macrocycles, as well as the ability of the planar dehydrobenzoannulenes to support weak induced ring currents. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis and Crystallographic Characterization of a Platinadehydrobenzo[19]annulene
作者:Joshua J. Pak、Timothy J. R. Weakley、Michael M. Haley
DOI:10.1021/om970661d
日期:1997.10.1
The efficient synthesis and characterization of the trans-platinum complex (Et3P)2Pt(C30H12) (2, PtDBA) is described. The X-ray crystal structure shows that a strained and warped annulenic core results upon insertion of the organometallic fragment. UV−vis data suggest electronic delocalization is present in the macrocycle.
描述了高效合成和表征跨铂配合物(Et 3 P)2 Pt(C 30 H 12)(2,PtDBA)。X射线晶体结构表明,在插入有机金属片段时,产生了应变和翘曲的环核芯。UV-vis数据表明大环中存在电子离域。
Haley, Michael M.; Brand, Stephen C.; Pak, Joshua J., Angewandte Chemie - International Edition in English, 1997, vol. 36, # 8, p. 835 - 838
作者:Haley, Michael M.、Brand, Stephen C.、Pak, Joshua J.