Formation of 6,10-Diphenyl-Substituted Heptalene-4,5-dicarboxylates
作者:Xudong Jin、Anthony Linden、Hans-J�rgen Hansen
DOI:10.1002/hlca.200590065
日期:2005.4
shown that 4,8-diphenylazulene (1) can be easily prepared from azulene by two consecutive phenylation reactions with PhLi, followed by dehydrogenation with chloranil. Similarly, a Me group can subsequently be introduced with MeLi at C(6) of 1 (Scheme 2). This methylation led not only to the expected main product, azulene 2, but also to small amounts of product 3, the structure of which has been determined