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  • Title: Phosphaquinomethane and phosphathienoquinomethanes, and their anion radicals.
    Author: Murakami F, Sasaki S, Yoshifuji M.
    Journal: J Am Chem Soc; 2005 Jun 29; 127(25):8926-7. PubMed ID: 15969550.
    Abstract:
    Phosphaquinomethane and phosphathienoquinomethanes sterically protected by Mes* (Mes* = 2,4,6-tri-tert-butylphenyl) were synthesized by 1,6-dehydration of the corresponding 4-phosphinoaryl carbinols. Structural similarities to the conventional quinoid compounds were revealed by 1H, 13C, and 31P NMR study and further confirmed by X-ray crystallography of the phosphathienoquinomethane. The corresponding anion radicals were generated by reduction with sodium, and considerable delocalization of an unpaired electron was demonstrated by EPR.
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