Sodium borohydride → HCID 178509566, compound

Participants

Reaction Steps

The polymerization of 3-[4-[4'-[(E)-2-methoxycarbonyl-vinyl]-biphenyl-4-yl]-cyclohexyl]-propyl trans-2-methyl-acrylate to poly [1-[3-[4-[4'-[(E)-2-methoxycarbonyl-vinyl]-biphenyl-4-yl]-cyclohexyl]-propoxycarbonyl]-1-methyl-ethylene] was effected analogously to Example 1. The polymer has the following phase succession (° C.): G 156 C 208 l The 3-[4-[4'-[(E)-2-methoxycarbonyl-vinyl]-biphenyl-4-yl]-cyclohexyl]-propyl trans-2-methyl-acrylate used as the starting material was prepared according to the following procedure: ##STR28## A solution of 12 g of trans-4'-[4-(3-oxo-propyl)-cyclohexyl]-biphenyl-4-carbonitrile (preparation: Mol. Cryst. Liq. Cryst. 1985, Vol. 131, 327) in 100 ml methanol/ether (9:1) was added dropwise at 0° C. within 5 minutes to a suspension of 1.39 g of sodium borohydride in 30 ml of methanol/ether (9:1). After 45 minutes a further 1 g of sodium borohydride was added. After a further hour the reaction was interrupted and the mixture was partitioned between methylene chloride and 1N hydrochloric acid. Thereupon, the organic phase was washed several times with water, dried over magnesium sulphate, filtered and evaporated. Crystallization from ethyl acetate/methylene chloride gave 11.5 g of trans-4'-[4-(3-hydroxy-propyl)-cyclohexyl]-biphenyl-4-carbonitrile as yellowish crystals. ##STR29##

Provenance & Evidence