作者:Robert S. Walters、Douglas M. Ho、Robert A. Pascal
DOI:10.1016/j.tetlet.2005.07.097
日期:2005.9
2',3',4',5',6',7'-Hexahydrodispiro[cyclopropane-1,1 '-anthracene-8',1"-eyelopropane] (1) was prepared by double olefination (Wittig) and double methylenation (Furukawa) of 1,8-dioxo- 1,2,3,4,5,6,7,8 - octahydroanthracene (4) that was in turn prepared in two steps from 1,3-dibromobenzene. The X-ray structure of 1 shows that the C-9-H of its anthracene core is located 2.6 angstrom from the centroids of each of the flanking cyclopropane rings. The H-1 NMR spectrum of 1 shows that the C-9-H resonance (delta 5.95) falls 0.84 ppm upfield from the C-10-H resonance (delta 6.79). (c) 2005 Elsevier Ltd. All rights reserved.