Leznoff, Clifford C.Drew, David M.2010-12-202010-12-201994Synlett, 1994, 623-624.http://hdl.handle.net/10315/6439enThe Synthesis of Pure 1,11,15,25-Tetrasubstituted Phthalocyanines as Single Isomers Using BisphthalonitrilesArticlehttps://www.thieme-connect.com/ejournals/pdf/synlett/doi/10.1055/s-1994-22949.pdf