A method for preparing 3-alkylsulphanyl-2-chloro-N-(1-alkyl-1H-tetrazol-5-yl)-4-trifluoromethylbenzamides of the formula (I) is described. ##STR00001## The substituents R.sup.1 and R.sup.2 therein are radicals such as alkyl and substituted phenyl.

The invention relates to bimesogenic compounds of formula I ##STR00001##
wherein R.sup.11, R.sup.12, MG.sup.11, MG.sup.12, X.sup.11, X.sup.12 and Sp.sup.1 have the meaning given in claim 1, to the use of bimesogenic compounds of formula l in liquid crystal media and particular to flexoelectric liquid crystal devices comprising a liquid crystal medium according to the present invention.

The invention relates to bimesogenic compounds of formula I ##STR00001##
wherein R.sup.11, R.sup.12, MG.sup.11, MG.sup.12, X.sup.11, X.sup.12 and Sp.sup.1 have the meaning given in claim 1, to the use of bimesogenic compounds of formula l in liquid crystal media and particular to flexoelectric liquid crystal devices comprising a liquid crystal medium according to the present invention.

Described herein are labeling agents, specifically [.sup.11C]fluoroform, [.sup.11C]difluoromethane, [.sup.11C]fluoromethyl iodide, [.sup.11C]fluoromethyl bromide, [.sup.11C]fluoromethyl chloride, [.sup.11C]fluoromethyl trifluoromethansulfonate, [.sup.11C]difluoromethyl iodide, [.sup.11C]difluoromethyl bromide, [.sup.11C]difluoromethyl chloride, [.sup.11C]difluoromethyl trifluoromethansulfonate, [.sup.11C]trifluoromethyl iodide, [.sup.11C]trifluoromethyl bromide, [.sup.11C]trifluoromethyl chloride, [.sup.11C]trifluoromethyl trifluoromethansulfonate, [.sup.18F]fluoroform, [.sup.18F]difluoromethane, [.sup.18F]difluoromethyl bromide or [.sup.18F]trifluoromethyl bromide. Also included are methods of labeling precursors to provide labeled fluoroalkanes and imaging methods.

Described herein are labeling agents, specifically [.sup.11C]fluoroform, [.sup.11C]difluoromethane, [.sup.11C]fluoromethyl iodide, [.sup.11C]fluoromethyl bromide, [.sup.11C]fluoromethyl chloride, [.sup.11C]fluoromethyl trifluoromethansulfonate, [.sup.11C]difluoromethyl iodide, [.sup.11C]difluoromethyl bromide, [.sup.11C]difluoromethyl chloride, [.sup.11C]difluoromethyl trifluoromethansulfonate, [.sup.11C]trifluoromethyl iodide, [.sup.11C]trifluoromethyl bromide, [.sup.11C]trifluoromethyl chloride, [.sup.11C]trifluoromethyl trifluoromethansulfonate, [.sup.18F]fluoroform, [.sup.18F]difluoromethane, [.sup.18F]difluoromethyl bromide or [.sup.18F]trifluoromethyl bromide. Also included are methods of labeling precursors to provide labeled fluoroalkanes and imaging methods.

An optical modulator includes an organic solid crystal thin film having an organic molecule and an electron withdrawing group (EWG) bonded to the organic molecule, a primary electrode disposed over a first region of the organic solid crystal thin film, and a secondary electrode disposed over a second region of the organic solid crystal thin film, wherein an optical property of the organic solid crystal thin film is configured to change in response to a changing voltage between the primary electrode and the secondary electrode.

An optical modulator includes an organic solid crystal thin film having an organic molecule and an electron withdrawing group (EWG) bonded to the organic molecule, a primary electrode disposed over a first region of the organic solid crystal thin film, and a secondary electrode disposed over a second region of the organic solid crystal thin film, wherein an optical property of the organic solid crystal thin film is configured to change in response to a changing voltage between the primary electrode and the secondary electrode.

The invention relates to a method for producing 3-alkylsulfanyl-2-chloro-N-(1-alkyl-1H-tetrazol-5-yl)-4-trifluoromethyl-benzamides of formula (I). In said formula, the substituents R.sup.1 and R.sup.2 represent residues such as alkyl and substituted phenyl.

##STR00001##

The invention relates to a method for producing 3-alkylsulfanyl-2-chloro-N-(1-alkyl-1H-tetrazol-5-yl)-4-trifluoromethyl-benzamides of formula (I). In said formula, the substituents R.sup.1 and R.sup.2 represent residues such as alkyl and substituted phenyl.

##STR00001##

The invention relates to a method for producing 3-alkylsulfanyl-2-chloro-N-(1-alkyl-1H-tetrazol-5-yl)-4-trifluoromethyl-benzamides of formula (I). In said formula, the substituents R.sup.1 and R.sup.2 represent residues such as alkyl and substituted phenyl.

##STR00001##