[CH2:1]([S:3][CH2:4][CH3:5])[CH3:2].[CH2:6]([I:28])[CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][CH2:26][CH3:27]>>[I-:28].[CH2:1]([S+:3]([CH2:4][CH3:5])[CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][CH2:26][CH3:27])[CH3:2]Diethyl sulphide is quaternized by docosyl iodide in order to obtain diethyldocosylsulphonium iodide. This iodide is then placed in an alcoholic solution with an equivalent of the TCNQ lithium salt. This gives crystals, which are recrystallized in alcohol. These crystals are constituted by the simple tetracyanoquinodimethane diethyl docosyl sulphonium salt of formula: ##STR4##
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