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