Bei der Kondensation von p‐Menthadienol 1 mit den Thiophloroglucinethern 2a–c erhält man neben den erwarteten thioanalogen Δ8‐THC‐Derivaten 3a–c auch noch die „anomalen”︁ Δ8‐Derivate 4a–c. Die Unterscheidung der Isomeren gelingt 1H‐NMR‐spektroskopisch.

Crystal structures, temperature dependent conductivity measurements and thermopower data of several DIMET radical salts are presented and discussed.1t.'TRODUCTION A surprising fact in the structures of the organic superconductors (TMTSF)2 CI0 4 and n-(BEDT-TTF)2X (X • I). 1Bri and Aul;> is that there exists a s light dimerisation of the donor mo lecules within the stacks of these radical cation salts. Therefore, the question arises whether a more pronounced dimerisation in organic radical salts of this type leads to stronger intra-and interstack interactions and to stronger couplings between the unpaired electrons. This might result in an increase of the transition temperature to superconductivity. A step in this direction is th e preparation of "unsymmetrical" donors like DIMEI, which was synthesized recently (1-41. This new donor was electrocrystallized by us in different solvents using tetrabutylammonium salts of various anions [1,2] like CLO~, ReO~. NO;, I J . ~uI2); PF 6 , ASF~ and SbF'6 as electrolytes. With all these anions radical salts were obtained and in some cases even several crystallographic different phases. Nevertheless, i n the electrocrystallization exists the problem that solvent molecules are easily incorporated into the radical salts. Due to this inclusion of the solvent molecules metal-insultor transitions occur often already at relatively high temperatures. In order to prevent *·DIME! -4.5-Dimethyl-4' .S'-ethylenedithiolotetrathiafulvalene -CloHIOS6' 03 79.fJ 779/87/53.50

26ben aus dem Text des Drohschreibens verfahren. Die Abbildung auf S. 25 zeigt die Chromatogramme. Man erkennt sofort, dafl die Farbstoffzusammensetzungen der Kugelschreiberpasten auf Schablone und Drohschreiben sowohl qualitativ als auch quantitativ ubereinstimmen. Die Farbstoffe konnten auch anhand ihrer UV/Vis-Spektren identifiziert werden: Es handelt sich um Methylviolett (mit einer Beimengung von Tetramethyl-prosaniliniumchlorid), Kristallviolett und Viktoriablau.