1,2,3,4,5,6‐Hexa(eq)alkylcyclohexan‐Modellverbindungen für Struktur‐Eigenschafts‐Vergleiche gesättigter discotischer Flüssigkristalle

1,2,3,4,5,6‐Hexa(eq)alkylcyclohexane Model Compounds for Structure‐Property Comparisons of Saturated Discotic Liquid Crystals The new hydrocarbon (1α, 2β, 3α, 4β, 5α, 6β)‐hexahexylcyclohexane ( 19 ) and a number of new and differently functionalized scyllo ‐hexaalkylcyclohexane derivatives ( 16a, b, 18a – c ) with identical stereochemistry were synthesized stereospecifically starting from simple chemical materials. In comparison to the known scyllitol hexaester 1 and the hexaether 2 none of the novel compounds 16, 18 , and 19 were thermomesomorphic. This extreme difference in the thermotropic liquid‐crystalline behaviour of the hexa(eq) hydroxy cyclohexane (scyllitol) derivatives 1 and 2 on the one hand and of our varied hexa(eq) alkyl cyclohexans 16, 18 , and 19 on the other obviously is a function of the presence and the position of the element oxygen within the side chains of these symmetric star‐/disc‐shaped compounds. Details concerning this oxygen effect are discussed briefly.