Preparation, methylation, and coupling reaction of 1,2-dithienyl-3,4- bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutenes

Kozo Toyota, Keita Abe, Keiko Horikawa, Masaaki Yoshifuji

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Sterically protected 1,2-di(2-thienyl)- and 1,2-di(3-thienyl)-3,4-bis[(2,4, 6-tri-t-butylphenyl)phosphinidene]cyclobutenes were prepared and their properties were studied. When the dithienyldiphosphinidenecyclobutenes were allowed to react with butyllithium and then with iodomethane, the corresponding methylthienyl derivatives were obtained. The structure of (E,E)-1,2-bis(5- methyl-3-thienyl)-3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutene was analyzed by X-ray crystallography. Lithiation of the dithienyldiphosphinidenecyclobutenes, followed by treatment with CuCl 2, afforded the corresponding coupling products on the thiophene rings.

Original languageEnglish
Pages (from-to)1377-1383
Number of pages7
JournalBulletin of the Chemical Society of Japan
Issue number7
Publication statusPublished - 2004


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