Recherches sur les Substances Mésomorphes III. Tolanes Nématiques

Abstract New p.p'-disubstituted diphenylacetylenes of the formula RO - C6H4 - C = C - C6H4 - R' have been prepared. Symmetrical and non-symmetrical diethers (R' = OR and R' = OR) and p' alkylated monoethers are described. Most of these compounds are nematic at temperatures lower than 50°. The temperatures and heats of transition and electro-optical characteristics (∊⊥ and ∊∥) of the compounds are given. The preparation of mesomorphic mixtures at room temperature is discussed.

[1]  Gerhard Meier,et al.  Electric Field-Induced Deformations in Oriented Liquid Crystals of the Nematic Type , 1972 .

[2]  W. R. Young,et al.  Mesomorphism in the 4,4′-Dialkoxy-trans-Stilbenes , 1972 .

[3]  W. R. Young,et al.  Preparation and thermodynamics of some homologous nitrones, a new group of liquid crystals , 1971 .

[4]  W. R. Young,et al.  New, Nonplanar trans-Stilbenes Exhibiting Nematic Phases at Room Temperature , 1971 .

[5]  J. A. Castellano,et al.  Liquid Crystals V. Nematic Materials Derived from p-Alkylcarbonato-p'-Alkoxyphenyl Benzoates , 1971 .

[6]  R. Steinsträsser,et al.  Nematische systeme IV , 1971 .

[7]  H. Kelker,et al.  Liquid Crystalline Phases Having Particularly Low Freezing Points , 1970 .

[8]  M. Tomkiewicz,et al.  Fluorescence and photochemistry of the charge-transfer band in aqueous europium(III) solutions , 1970 .

[9]  H. Kelker,et al.  A Liquid-crystalline (Nematic) Phase with a Particularly Low Solidification Point , 1969 .

[10]  H. Spiesecke,et al.  Low‐Melting Nematic Phases for Determination of NMR Spectra of Orientated Molecules , 1967 .

[11]  E. Lodemann,et al.  Über die O-Trifluoracetylierung von Nucleosiden , 1967 .

[12]  M. Newman,et al.  Reactions of Dipivaloyl with Organometallic Reagents1 , 1958 .

[13]  C. Overberger,et al.  The Preparation and Polymerization of p-Alkylstyrenes.1 Effect of Structure on the Transition Temperatures of the Polymers , 1953 .

[14]  P. Carter,et al.  37. Synthetic oestrogens of the triphenylethylene series , 1948 .

[15]  J. Watson,et al.  97. Tetra-aryl-phosphonium, -arsonium, and -stibonium salts. Part III. The synthesis and properties of tetra-aryl-arsonium salts having four dissimilar aryl groups , 1947 .

[16]  M. Renoll,et al.  Vinyl Aromatic Compounds. I. The Vapor Phase Dehydration of Arylmethylcarbinols , 1946 .

[17]  C. Marvel,et al.  Hexa-p-alkylphenylethanes. The Effect of the p-Alkyl Group on the Dissociation of the Ethane , 1935 .

[18]  B. Jones.  426. The halogenation of phenolic ethers and anilides. Part V. Alkyl and ω-substituted-alkyl ethers , 1935 .

[19]  A. E. Bradfield,et al.  CCCCVI.—The halogenation of phenolic ethers and anilides. Part II. Additional velocity measurements in 99% acetic acid , 1931 .

[20]  J. Johnston.  Solubility Relations of Isomeric Organic Compounds. I , 2022 .

[21]  D. Vorländer.  Über Polymorphie der Flüssigkeiten , 1907 .