| http://www.w3.org/ns/prov#value | - ???Polar aprotic solvent??? refers to an organic solvent having a dipole moment of about 2 debye units or more (Atkins, 1978; CRC Handbook, 1982; Reichardt, 1990), a water solubility of at least about 5% (volume) at or near ambient temperature, i.e. about 20 ??? C., and which does not undergo hydrogen exchange at approximately neutral pH i.e. in the range of 5 to 9, and preferably in the range of
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