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TADDOLs with Unprecedented Helical Twisting Power in Liquid Crystals. Preliminary communication

✍ Scribed by Hans-Georg Kuball; Bernhard Weiß; Albert K. Beck; Dieter Seebach

Publisher
John Wiley and Sons
Year
1997
Tongue
German
Weight
539 KB
Volume
80
Category
Article
ISSN
0018-019X

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✦ Synopsis

In July 1994, there were ca. 60 TADDOLs with ca. 20 X-ray structures described ; in August 1996, these numbers for TADDOLs and analogs were ca. 120 and 35, respectively [9].

Most of these products have been described previously [6][8][1la][16]. The new compounds, 4, 5, 7, 11, 13, 15, and 16, have been prepared by standard procedures [6c] and will be described in a forthcoming full paper ZLI-1695 was obtained from E. Merck (Darmstadt), K15 from E. Merck (Great Britain). ~7 1 . ') ' ) The disclination lines form a double spiral r2 = kq with k being proportional to the pitch [3b]. r is the distance ' ) ZLI-1695 exists as a nematic phase between 13 and 7 2 9 , K15 between 23 and 35". between the origin and the point of the spiral with an azimuth cp. For details, see [3c]. lo) For previous record values, see [k].

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