A permethylated analogue 1 of the mushroom pigment norbadione A was synthesized through a double Suzuki–Miyaura coupling of 1,7-diboronated naphthalene 2 and triflate 3. ESI-MS studies showed similar constants for the formation of the complexes of the norbadione A dipotassium salt and of 1 with a cesium ion, thus suggesting that cesium complexation involves the two pulvinic acid parts of these molecules. Tf=trifluoromethanesulfonyl.
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Murr et al. (2003) studied this question.
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