Synthesis of pyran derivatives with mesomorphic properties

✍ Scribed by M. M. Murza; A. E. Tarasenko; M. G. Safarov

• Publisher: Springer US
• Year: 1991
• Tongue: English
• Weight: 188 KB
• Volume: 27
• Category: Article
• ISSN: 0009-3122
• DOI: 10.1007/bf00476198

✦ Synopsis

N-(4-Arylidene)-4'- (3,6-dihydro-4-methyl-2H-pyran-3-yloxy)anilines and N-(4-arylidene)-4'- [(5,6dihydro-2H-pyran-4-yl)methoxy]aniIines that have the properties of smectic and nematic liquid crystals were synthesized. The effect of the pyran ring and the length of the aliphatic radical on the type and thermal stability of the meso phase was elucidated.

A constantly increasing number of studies are being devoted to the synthesis of azomethines that display mesomorphism at low temperatures [1]. Since these compounds have a clearly expressed electro-optical effect, the search for new liquid-crystal compounds of this series is of particular interest.

The synthesis ofN-(4-arylidene)-4'-(3,6-dihydro-4-methyl-2H-pyran-3-yloxy)anilines I-XIIand N-(4-arylidene)-4'-[5,6-dihydro-2I-I-pyran-4,yl)methoxy]anilines XIII-XXV (see Table 1