Meili Duan

University of California, Davis

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Shunsuke Takenaka

Yamaguchi University

Vladimir F. Petrov

National Research University of Electronic Technology

H. Okamoto

Yamaguchi University

Hiroaki Okamoto

Kyoto University

Takeyasu Tasaka

Yamaguchi University

Michael D. Toney

University of California, Davis

Yo Shimizu

Nara Institute of Science and Technology

Mitsuru Mukae

Okayama University

Kayako Hori

Ochanomizu University

Jin Mu

Jilin University

Cooperative Institutions

Yamaguchi University

Osaka University

Materials Science & Engineering

Okayama University

National Institute of Advanced Industrial Science and Technology

Osaka National Hospital

National Research Institute

Okayama University of Science

Okayama Shoka University

Kyoto University

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The Effect of Trifluoromethyl and Difluoromethoxy Groups on Mesomorphic Properties

Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals (2001)

Kiyoshi Kimoto Meili Duan H. Okamoto Vladimir F. Petrov Kayako Hori

Abstract This paper describes the effect of terminal substituent on the mesomorphic properties in 3-and 4-(4-alkoxyphenoxycarbonyl)phenyl 3- and 4-R-benzoate and 4-(4-alkoxybenzoyloxy)phenyl 2-, 3-, and 4-R-benzoates (R = CF3, OCF3, OCF2H). The meta-trifluoromethoxy and para-difluoromethoxy compounds tend to show a smectic C phase, as well as smectic A and nematic ones, and introduction of a chiral carbon in the alkoxyl group induces the chiral smectic C one.

Benzoates

10.1080/10587250108025042

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Citations (2)

Perfluoro(Alkoxy)Alkylation in One-Ring Liquid Crystalline Derivatives

Vladimir F. Petrov Meili Duan H. Okamoto Shunsuke Takenaka

Abstract The effect of introducing the perfluoro(alkoxy)alkyl groups into liquid crystalline one-ring derivatives on the appearance of the mesophases and their physico-chemical properties is discussed and compared with that of the corresponding (alkoxy)alkyl groups.

10.1080/10587250008025244

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Citations (8)

A crystal engineering utilization of hexafurcated hydrogen bonding to construction of subnano fluorinated tunnels

Journal of Fluorine Chemistry (2003)

Toshimasa Katagiri Meili Duan Mitsuru Mukae Kenji Uneyama

Crystal Engineering

Crystal (programming language)

10.1016/s0022-1139(02)00326-3

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Citations (17)

Highly Regioselective One‐Pot Synthesis of 7‐Hydroxy‐6‐methylphthalide from 3‐Hydroxy‐4‐methylbenzylalcohol

Synthetic Communications (2005)

Meili Duan Michael D. Toney

Abstract 7‐Hydroxy‐6‐methylphthalide 2 was synthesized with high regioselectivity and moderate yield using a novel one‐pot synthesis that employed 3‐hydroxy‐4‐methylbenzylalcohol 1 and formaldehyde in the presence of tin(IV) chloride as catalyst and triethylamine as base. The proposed mechanism of the formation of 2 involves ortho‐formylation followed by hemiacetal formation and oxidation. Keywords: 3‐Hydroxy‐4‐methylbenzylalcohol7‐hydroxy‐6‐methylphthalideone‐pot synthesisregioselective Acknowledgment The author thanks the National Institutes of Health for its financial support (Grant No. GM54779).

Formylation

Triethylamine

Hemiacetal

One-pot synthesis

10.1080/00397910500297214

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Citations (2)

Liquid crystalline properties of dissymmetric molecules IV. The substituent effect on thermal properties of nematic and smectic A phases in three aromatic ring systems with ester linkages

Liquid Crystals (2000)

Meili Duan Takeyasu Tasaka H. Okamoto Vladimir F. Petrov Shunsuke Takenaka

This paper describes the effect of substituent and ester linkage on smectic properties for some derivatives of 4-R -phenyl 4-(4-octyloxybenzoyloxy)benzoates (1), 4-octyloxyphenyl 4-(4-R-benzyloxy)benzoates (2), 4-(4-octyloxybenzoyloxy)phenyl 4- R -benzoates (3), and 4-R-phenyl 4-octyloxyphenyl terephthalates (4) where R = OCH3, CH3, OC8H17, C8H17, halogens, CF3, OCF3, CN, NO2, etc. The thermal properties are discussed in terms of the electrostatic nature of the substituents and the relative orientation of the ester groups with respect to both terminal substituents. The substituent effect on the layer structure of the smectic A phase is also examined by means of a small angle X-ray analysis.

Benzoates

10.1080/02678290050122042

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Citations (24)

Liquid-Crystalline Properties of Dissymmetric Molecules Part 3: Smectic Properties of 4-[2-(Perfluoroalkyl)ethoxy]-Substituted Nitrobenzenes and Benzonitriles

Bulletin of the Chemical Society of Japan (1999)

Meili Duan Hiroaki Okamoto Vladimir F. Petrov Shunsuke Takenaka

Abstract This paper describes the thermal properties of some homologs of 4- and 3-[2-(perfluoroalkyl)ethoxy]-substituted nitrobenzenes and benzonitriles. Many of the homologs show notable smectic properties involving smectic A and B phases. The smectic structures were characterized by an X-ray diffraction examination. The smectic A phase has a partially interdigitated bilayer arrangement where the layer spacing is 1.2—1.8 times the calculated molecular length. Interestingly, some homologs show a smectic B phase with a layer spacing of 2 times the calculated molecular length. Both fluorophilic and polar interactions are supposed to play important roles for the molecular arrangements.

Nitrobenzene

10.1246/bcsj.72.1637

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Citations (31)

Substituent effect on smectic properties for three-aromatic ring systems

日本液晶学会討論会講演予稿集 (1999)

Meili Duan Takeyasu Tasaka H. Okamoto V. I. Petrov Shunsuke Takenaka

Source

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Liquid Crystalline Properties of 3,4-Di-and 2,4-Di(4-alkoxybenzoyloxy)-benzylidene-4-alkoxyanilines

Meili Duan H. Okamoto Vladimir F. Petrov Shunsuke Takenaka

Abstract This paper describes liquid crystalline properties for some homologs of 3,4-di-(1) and 2,4-di(4-alkoxybenzoyloxy)benzylidene-4-alkoxyanilines (2) and some related compounds. Compounds 1 tend to show a nematic phase with a notable cybotactic with a layer structure and also a smectic C phase when the alkoxyl groups are suitably long. Compounds 2 show only a monotropic nematic phase, and the nematic-isotropic transition temperatures show a notable even-odd effect even in the higher homologs. The smectic C phase was further characterized by X-ray examination, and the liquid crystalline properties are discussed in terms of the molecular structure characteristic.

Homologous series

10.1080/10587259908025425

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Citations (1)

A New Mesomorphism of the Alkyl 4-(2-Perfluoroalkyl)ethoxybenzoate Derivatives

Bulletin of the Chemical Society of Japan (1998)

Meili Duan Hiroaki Okamoto Vladimir F. Petrov Shunsuke Takenaka

Abstract The liquid-crystalline properties of the homologous members of alkyl 4-(2-perfluorooctyl)ethoxy-3-R-benzoates (R = H (1), NO2 (3), Br (4)) show a new mesomorphic behavior. The lower alkyl (methyl–pentyl) esters of 1 exhibit a smectic A phase, and the smectic A-isotropic transition temperature tends to decrease with increasing the carbon number of the alkyl group, where the layer spacing of the smectic A phase tends to become short with increasing carbon chain length. The hexyl–decyl esters are non-mesogenic, and the after members again show a smectic A phase. The similar trend has been found for 3 and 4. Homologous members of alkyl 4-(2-perfluorodecyl)ethoxybenzoates (2) also show a similar thermal behavior. The smectic properties are strongly dependent on the relative constitution of the perfluoroalkyl group to the alkyl one within the molecule. The molecular arrangement of the smectic A phase is discussed.

10.1246/bcsj.71.2735

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Citations (39)

Highly Regioselective One‐Pot Synthesis of 7‐Hydroxy‐6‐methylphthalide from 3‐Hydroxy‐4‐methylbenzylalcohol.

ChemInform (2006)

Meili Duan Michael D. Toney

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

10.1002/chin.200615097

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Citations (0)