1: With Rink resin; trimethyl orthoformate T=25°C; 2 h; 2: With lithium borohydride in tetrahydrofuran T=65°C; 5 h; 3: With trifluoroacetic acid in dichloromethane T=25°C;
1: Ph3P(1+)CH2COOEt(Cl(1-)) With sodium hydride in tetrahydrofuran; mineral oil 1 h; Inert atmosphereReflux; 2: 4-monomethoxy-1-naphthaldehyde in tetrahydrofuran; mineral oil T=0 - 20°C; Wittig reaction; Inert atmosphere; 3: With sulfuric acid in acetone 6 h; Reflux;
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Windaus; Bernthsen-Buchner
Chemische Berichte, 1917 , vol. 50, p. 1122
