Genzer et al.
Journal of the American Chemical Society, 1951 , vol. 73, p. 3159,3160
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Kulka
Journal of Organic Chemistry, 1957 , vol. 22, p. 241,242
1: 4-hydroxy-benzaldehyde With sodium hydride in N,N-dimethyl-formamide
T=20°C; 1.5 h;
2: 4-chloro-butyl chloride in N,N-dimethyl-formamide
T=70°C; 2 h; Further stages.;