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- W4236077261 abstract "In order to clear the behavior of lignin during nitric acid pulping, guaiacylglycerol-β-guaiacyl ether (GG), an important dimeric model compound of lignin, was treated with N-nitric acid. The results are summarized as follows.1) Chloroform-soluble products obtained at 65°C were fractionated into neutral, phenolic and acidic fractions according to the scheme (Fig. 1), which includes a step of NaBH4-reduction, and each fraction was weighed (Table 1). The finding of α-O- (2-methoxyphenyl) glycerol (IIb) for the first time in high yields comparable with those of 4-nitroguaiacol and 4, 6-dinitroguaiacol proved that the side-chain displacement reaction (scheme 1 in Fig. 8) is the most important de-lignifying reaction during the nitric acid pulping.2) The isolation of 2-methoxy-p-benzoquinone and the detection of vanillic, glycolic, glyceric and tartronic acids indicate that oxidation occurs during the nitric acid treatment at 65 °C.3) The detection of guaiacol indicates that hydrolysis of β-aryl ethers occurs even at 50 °C.4) No nitro-compound was formed at 50 °C, whereas α-O- (2-methoxyphenyl) glyceraldehyde (IIa) was formed at this temperature. This finding suggests that such a cleavage reaction as that shown in the scheme 2 in Fig. 8 may also occur.5) No product other than α-ethyl ether of GG (XIV) was formed by the treatment in the presence of ethanol.6) Development of GG on a silicate plate by using acetone and acetic acid as an eluent resulted in the formation of isopropylidene derivatives (XIIIa and XIIb)." @default.
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- W4236077261 date "1982-01-01" @default.
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- W4236077261 doi "https://doi.org/10.2524/jtappij.36.798" @default.
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