Compounds 1～12 were synthesized by using 6-alkyl-2-decalone as raw material and through reactions of corresponding carbonyl compounds with Grignard reagent, dehydration, reduction and isomerization. Yields from 9.9% to 80.8% were got and those of compounds 2 and 3 are higher than the reported data. Structures of the products have been identified by IR, ¹³C NMR and MS spectra, and their phase transition behaviors were measured by DSC. Using base as catalyst, isomerization mechanism among decalin derivatives was also studied.

Key words: liquid crystal, synthesis, configuration, phase transition temperature, trans-decalin