in neat (no solvent)
heating very slow (due to danger of explosion) to 80°C with formation of liquid residue;; distillation;;
参考文献
Kirsanov, A. V.
Zhurnal obshchei Khim., 1954 , vol. 24, p. 1033 - 1038
C. A., 1955 , p. 8787
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Gmelin Handbook: P: MVol.C, 274, page 629 - 631