104660-73-3

Upstream product

• 111241-42-0 2-pentylpropane-1,3-diyl bis(4-methylbenzenesulfonate) 
• 66016-04-4 3-Pentyl-cyclobutane-1,1-dicarboxylic acid diethyl ester 
• 25462-23-1 2-pentylpropane-1,3-diol 
• 103057-51-8 hypochlorous acid 4-methylbenzene sulfonic anhydride 
• 104660-62-0 (1-Hydroxymethyl-3-pentyl-cyclobutyl)-methanol 

Relevant academic research and scientific papers

Synthesis and liquid crystal properties of compounds incorporating cyclobutane, spiroheptane and dispirodecane rings

A number of esters of structure (I) incorporating the cyclobutane, spiroheptane, or dispirodecane rings has been prepared using a diethyl malonate synthesis.Strict comparison of the liquid crystal behaviour amongst the three classes containing a terminal cyano-substituent was not possible because both the cyclobutanes and dispirodecanes are mixtures of cis- and trans-isomers; the spiroheptanes are racemic systems.Using preparative hplc, it was however possible to isolate the pure cis- and trans-isomers of two of the cyano-substituted cyclobutane esters (I; R = alkyl, -X- = --, Y = CN).From the physical data and the results for the corresponding spiroheptane esters, conclusions regarding the effects of these ring systems on liquid crystal behaviour were obtained.The pure cis- and trans-isomers of the cyclobutane ester (I, R = C3H7, -X- = --, Y = CN) have been assessed for the trends in both order parameter and viscosity with temperature; the results support the idea that idea that the trans-cyclobutane ring adopts a more planar conformation at higher temperatures.Keywords: cyclobutane- and related spiro-systems, cis-/trans-isomerism, order parameter, briefringence, viscosity, structure/property relations.