in neat (no solvent) at 200°C (refluxing) or in an autoclave under pressure;;
参考文献
Ashby, E. C.
Journal of the American Chemical Society, 1959 , vol. 81, p. 4791 - 4795
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Gmelin Handbook: B: B-Verb.14, 3.8.1.3, page 104 - 105