SYNTHESIS AND PROPERTIES OF A NEW FAMILY OF CHIRAL MESOGENS CONTAINING THE 2,3-DIHYDROBENZOPYRAN NUCLEUS

Authors
BONINI BF CARBONI P GOTTARELLI G MASIERO S SPADA GP
Citation
Bf. Bonini et al., SYNTHESIS AND PROPERTIES OF A NEW FAMILY OF CHIRAL MESOGENS CONTAINING THE 2,3-DIHYDROBENZOPYRAN NUCLEUS, Journal of organic chemistry, 59(20), 1994, pp. 5930-5936
Citations number
13
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Journal of organic chemistry → ACNP
ISSN journal
00223263
Volume
59
Issue
20
Year of publication
1994
Pages
5930 - 5936
Database
ISI
SICI code
0022-3263(1994)59:20<5930:SAPOAN>2.0.ZU;2-E
Abstract
A new class of mesogens A with a central chiral core based on the 2,3- dihydrobenzopyran nucleus was synthesized both in the racemic and opti cally pure form, and the thermotropic properties were studied. The dis tortion from structural linearity due to the presence of the 2,3-dihyd ropyran ring does not inhibit the existence of mesophases, and Ch, S-A , and S-C phases were observed according to the substituents present. The conformational constrictions imposed by cyclization proved not to be very important in determining the compactness of the cholesteric he lix.