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A Supercharged Anion with a Silyl-Substituted Eight-Center, Twelve-Electron π System: Synthesis and Characterization of the Tetralithium Salt of an Octasilyl-Substituted Trimethylenecyclopentene Tetraanion

✍ Scribed by Prof. Dr. Akira Sekiguchi; Dipl.-Chem. Tsukasa Matsuo; Dr. Chizuko Kabuto

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 384 KB
Volume: 36
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.199724621

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✦ Synopsis

Thedatafor14(Tm = -1S.2"C,AH = 40kJmol-')areconsistent with the results of McElhaney et al.['31 for other diacylphosphatidylcholines with longer chain lengths (e. g. T, = -18.8 "C and AH = 32.6 kJmol-' for bis(l0-methylun-decanoy1)phosphatidylcholine). Comparison of our data with that for the corresponding nonbranched didecanoylphosphatidylcholine (15; T, = -7.9"C, AH = 53 kJ mol-') shows that, in contrast to compounds with linear chains, a slightly disturbed gel state can be assumed for the diisoacylphosphatidylcholines.

Diacylphosphatidylcholines 10-15 were analyzed with a film balance (Lauda FW 2) to ascertain their behavior at the waterair interface. The shapes of the z-A-isotherms at 0 and 20 "Care almost identical and characteristic of those from expanded films (Figure2). An increase in the surface per molecule of SO to

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