Oxidative Coupling Copolymerization of 2,6-Dimethylphenol and Dihydroxynaphthalene Affording Poly(phenylene oxide) Derivatives

Table 4

Solubility of the obtained copolymers.

Solvent	Poly(DMP/2,6-DHN)			Poly(DMP)^b
	(-OH)^a	(-OCOBn)	(-OCONHn-Bu)
THF	S	S	S	I
CHCl3	S	S	S	S
MeOH	I	I	S	I
HFIP	S	—	—	I
EtOH; + NaOH aq.^c	S	—	—	I

I: insoluble; S: soluble.
^aDMP unit : DHN unit = 51 : 49. = 7.26 × 10⁴, / = 4.9 (measured by SEC).
^cEtOH/0.1 M NaOH aq. = 10/1.