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DOI: 10.1039/A701920C (Paper) Reference Section for: J. Chem. Soc., Perkin Trans. 2, 1998, 725-736

Formation of huge cyclic oligomers in the condensation polymerization of bis(9-hydroxy-1,4,7-trioxanonyl) substituted naphthalene and benzenes with both aromatic and aliphatic bis-acid chlorides

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Ingrid J. A. Mertens, René Wegh, Leonardus W. Jenneskens, Edward J. Vlietstra, Anca van der Kerk-van Hoof, Jan W. Zwikker, Thomas J. Cleij, Wilberth J. J. Smeets, Nora Veldman and Anthony L. Spek

Abstract

Without the use of high dilution techniques condensation polymerization of bis(9-hydroxy-1,4,7-trioxanonyl) substituted naphthalene and benzenes (1a–d) with the bis-acid chlorides terephthaloyl dichloride (2), adipoyl dichloride (5a) and isophthaloyl dichloride (5b) at 80 °C, respectively, gives giant-size macrocycles, i.e. crownophanes 3a(n) with n = 1–5, 3b–d(n) with n = 1–3 and 6a–b(n) with n = 1–2, respectively, in high overall yield (ca. 30% w/w, monomer conc. 0.033 M). The crownophanes with 28–150 atom perimeters have been isolated using preparative column chromatography. Both in the melt and in solution, with a ten-fold increase in monomer conc. (0.33 M), cyclic oligomer yields remain considerable (melt, ca. 2% w/w, and solution ca. 10% w/w). 1H NMR conformational analysis of the 9-hydroxy-1,4,7-trioxanonyl side chains of both 1a and 1d at 25 and 80 °C have shown that all HO–[CH(I)2–CH(II)2–O]n– units are almost exclusively present in their gauche conformation at both temperatures. This is supported by semi-empirical AM1 calculations. Hence, favourable pre-orientation of the side chains is apparently an important factor in the formation of cyclic oligomers. Single crystal X-ray structures of 3a(1), 3d(1) and 6a(1) are reported; solid-state packing motifs are strongly affected by the type of diol and bis-acid constituent.

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