Switchable Columnar Phase Formed from Bent-Shaped Molecules with Low Bent-Angle Naphthalene Central Core and Alkylthio Tail
摘要:
Novel low-angle bent molecules with 1,7-naphthalene central core and alkylthio tails form the hexagonal columnar phase as well as the well-known B4 phase. The columnar phase has a large two-dimensional hexagonal lattice of 65-70 angstrom and exhibits the antiferroelectric switching with the spontaneous polarization along the column axis. The column is considered to be constructed by the cylindrically enclosed layer.
Switchable Columnar Phase Formed from Bent-Shaped Molecules with Low Bent-Angle Naphthalene Central Core and Alkylthio Tail
摘要:
Novel low-angle bent molecules with 1,7-naphthalene central core and alkylthio tails form the hexagonal columnar phase as well as the well-known B4 phase. The columnar phase has a large two-dimensional hexagonal lattice of 65-70 angstrom and exhibits the antiferroelectric switching with the spontaneous polarization along the column axis. The column is considered to be constructed by the cylindrically enclosed layer.
Facile Preparation of Aryl Sulfides Using Palladium Catalysis under Mild Conditions
作者:Tatsuo Okauchi、Kouji Kuramoto、Mitsuru Kitamura
DOI:10.1055/s-0030-1259012
日期:2010.12
A convenient method for C-S cross-coupling of aryl bromides with various thiols has been developed that involves the use of a 1,1'-bis(diphenylphosphino)ferrocene (DPPF)-ligated palladium complex with N,N-diisopropylethylamine (DIPEA) as the base. This coupling is tolerant of a wide range of functional groups, including hydroxy, amino, cyano, nitro, formyl, and carboxyl groups.
One-Pot Synthesis of Amine-Substituted Aryl Sulfides and Benzo[<i>b</i>]thiophene Derivatives
作者:Zhongyu Duan、Sadananda Ranjit、Xiaogang Liu
DOI:10.1021/ol100816g
日期:2010.5.21
A series of amine-substituted aryl sulfides have been synthesized from nitroaryl halides via a simple one-pot procedure involving metal-free C S cross-coupling and in situ nitro group reduction. Various nitroaryl halides were reacted with thiols in recyclable poly(ethylene glycol) to afford the amine-substituted aryl sulfides in high yield. Additionally, the cross-coupling reactions of nitro- and aldehyde-substituted aryl halides with benzyl thiols under the same reaction conditions were demonstrated to afford benzothiazole and phenylbenzo[b]thiophene derivatives.
Heppke; Parghi; Sawade, Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals, 2001, vol. 352, p. 745/311-752/318