Showing papers by "Hiroki Kondo published in 1981"
19 citations
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TL;DR: In this paper, a paracyclophane, 6,21-dioxo-5,22-diaza[10.10]paracyCLophane (4) has been synthesized by a condensation of 5,5′-p-phenylenebis (valeroyl chloride) with 4,4′ p-phenylon(butylamine) by a high dilution method.
Abstract: A novel paracyclophane, 6,21-dioxo-5,22-diaza[10.10]paracyclophane (4) has been synthesized by a condensation of 5,5′-p-phenylenebis (valeroyl chloride)(5) with 4,4′-p-phenylenebis(butylamine)(3) by a high dilution method. It has been characterized by means of u.v., i.r., and n.m.r. spectroscopy. The two amide bonds in compound (4) were found to assume the s-trans-geometry. No significant transannular interaction was observed between the two benzene rings. Upon cooling, the rotation of the benzene rings was hindered as evidenced by splitting of the n.m.r. ring proton signal into a doublet. The energy of activation for this hindered rotation was evaluated as 0.9 kcal/mol with a coalescence temperature of 30 ± 5 °C.
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TL;DR: A trianionic fluorescent probe, pyranine, was found to bind to positively charged liposomes as evidenced by a linear increase in the fluorescence polarization with the liposome concentration.
Abstract: A trianionic fluorescent probe, pyranine, was found to bind to positively charged liposomes as evidenced by a linear increase in the fluorescence polarization with the liposome concentration. Addition of perchlorate ion reduced the polarization of fluorescence, suggesting that perchlorate and pyranine compete for the same binding site on the surface of cationic liposomal membranes.
1 citations