1980
O. Goyot, M. Gingras / Tetrahedron Letters 50 (2009) 1977–1981
Figure 1. Qualitative crystallinity of p-methylated oligomers under a microscope
lens equipped with a camera at 20 °C: (a) 11; (b) 16; (c) 18; (d) 20.
The limit to the efficiency of the classic Cu2O method was evalu-
ated. The qualitative degree of crystallinity was investigated for a
series of PPS oligomers.
Acknowledgments
We acknowledge Professor Nicolas Sbirrazzuoli for a few DSC
measurements, Jean-Denis Sylvain for microscopy studies, CNRS
(French National Center for Scientific Research), the University of
Nice-Sophia Antipolis, and Jean-Marie Guigonis for MS spectra.
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