Synthesis, Characterization and Mesophase Behavior of New Liquid Crystalline Compounds Having Chalcone as a Central Linkage
摘要:
Mesogens with a chalcone central linkage are rare. It is believed that the chalcone linkage is not conducive to mesomorphism. But when chalcone linkage is present with other central linkages like azomethine, ester or azo it becomes condusive to mesomorphism. In the present study two new homologous series viz. 1-(4'-butyloxybiphenyl-4-yl)-3-(4-alkoxyphenyl) prop-2-en-1-one (Series-I) and 4-[3-(4'-butoxybiphenyl-4-yl)-3-oxoprop-1-en-1-yl] phenyl 4-alkoxybenzoate (Series-II) were synthesized having the chalcone as a central linkage. Series-I having only chalcone central linkage through it exhibit mesomrphism due to the presence of alkoxy biphenyl group at one end which is rich source to provide to increase linearity and rigidity of the molecule. Series-II which contains chalcone as well as ester as a central linkage and it also exhibit mesomorphism. The compounds of the both series have been characterized by standard methods. Their liquid crystalline properties have been investigated by optical polarizing microscopy and DSC studies.
Synthesis, Characterization and Mesophase Behavior of New Liquid Crystalline Compounds Having Chalcone as a Central Linkage
摘要:
Mesogens with a chalcone central linkage are rare. It is believed that the chalcone linkage is not conducive to mesomorphism. But when chalcone linkage is present with other central linkages like azomethine, ester or azo it becomes condusive to mesomorphism. In the present study two new homologous series viz. 1-(4'-butyloxybiphenyl-4-yl)-3-(4-alkoxyphenyl) prop-2-en-1-one (Series-I) and 4-[3-(4'-butoxybiphenyl-4-yl)-3-oxoprop-1-en-1-yl] phenyl 4-alkoxybenzoate (Series-II) were synthesized having the chalcone as a central linkage. Series-I having only chalcone central linkage through it exhibit mesomrphism due to the presence of alkoxy biphenyl group at one end which is rich source to provide to increase linearity and rigidity of the molecule. Series-II which contains chalcone as well as ester as a central linkage and it also exhibit mesomorphism. The compounds of the both series have been characterized by standard methods. Their liquid crystalline properties have been investigated by optical polarizing microscopy and DSC studies.
The cyclodextrin-tetraphosphine hybrid coined α-Cytep allows turnover numbers up to 340 000 000 000 and turnover frequencies up to 1 000 000 000 h−1 to be reached in Suzuki–Miyaura reactions. These exceptional figures are clearly linked to the outstanding longevity of the reactive species induced by the ligand α-Cytep and illustrates the rising potential of cyclodextrins in catalytic applications.
In the first communication the synthetic methods are described for preparing aromatic analogues of juvenile hormone like activity. The para-substituted 2-methyl-cinnamic acid derivatives are formed by a Friedel-Crafts acylation of a phenol, followed by the Wadsworth-Emmons (Wittig-Horner)-Reaction with the corresponding phosphonates. More than 120 compounds are listed.
Molecular compatibility of a guest porphyrin in a thermotropic nematic liquid crystalline host phase was shown to control the orientation of the porphyrin chromophore. In this manner, the normal alignment of a porphyrin plane parallel to the director in a nematic phase was inverted to a perpendicular orientation by attachment of mesogenic type appendages orthogonal to a porphyrin ring on one side of
Study on the design, synthesis and structure-activity relationships of new thiosemicarbazone compounds as tyrosinase inhibitors
作者:Senchuan Song、Ao You、Zhiyong Chen、Guoxun Zhu、Huan Wen、Huacan Song、Wei Yi
DOI:10.1016/j.ejmech.2017.08.033
日期:2017.10
of selected compounds 3d and 6e were investigated, revealing that such type of compounds were belonged to the reversible and competitive tyrosinase inhibitors. To verify the safety of these developed thiosemicarbazone compounds, four randomly selected compounds 3d, 4e, 6a and 9a were also tested in 293T cell line for the evaluation of the cytotoxicity. Interestingly, all these compounds almost did not
[EN] CYCLIC PEPTIDE COMPOUNDS AND RELATED METHODS, SALTS AND COMPOSITIONS<br/>[FR] COMPOSÉS DE PEPTIDES CYCLIQUES ET PROCÉDÉS, SELS ET COMPOSITIONS ASSOCIÉS
申请人:MERCK SHARP & DOHME
公开号:WO2015172047A1
公开(公告)日:2015-11-12
This invention relates to compounds useful in the preparation of lipopeptides and related methods of preparing and using these compounds.