"Bases mean Bronsted bases such as LiOH, NaOH, KOH, Li, Na or K alcoholates or quaternary ammonium hydroxide or C.sub.2 -Cl.sub.4 -dialkylamines such as dimethylamine, diethylamine, methylethylamine, dipropylamine, diisopropylamine, ethylbutylamine, dibutylamine or C.sub.3 -C.sub.20 -trialkylamines such as trimethylamine, triethylamine,
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