A simple methodology for Cu-catalyzed cyanation of aryl halides with K4[Fe(CN)6] was developed with water as the solvent in conjunction with ligand-free Cu(OAc)2·H2O as the catalyst. The suggested methodology is applicable to cyanation of a wide range of aryl iodides and activated aryl bromides, and allows the catalyst to be reused six times with a very slight change in the catalytic activity.
Application of a recyclable fluorous oxime in the convenient synthesis of 3-amino-1,2-benzisoxazoles and 4-amino-1H-2,3-benzoxazines
作者:Wei Jie Ang、Chi-Yuan Chu、Tzyy-Chao Chou、Lee-Chiang Lo、Yulin Lam
DOI:10.1039/c3gc36966h
日期:——
A microwave-assisted, fluorous synthetic route to 3-amino-1,2-benzisoxazoles and 4-amino-1H-2,3-benzoxazines has been developed. The strategy comprises linking the respective 2-fluorobenzonitrile or 2-(bromomethyl)benzonitrile to a fluorous oxime tag to give an aryloxime intermediate which then undergoes cyclization with concomitant cleavage of the substrate-tag in acidic conditions to provide the
已开发出一种微波辅助的氟合成路线,用于 3-氨基-1,2-苯并恶唑和4-氨基-1 H -2,3-苯并恶嗪。该策略包括将各自的2-氟苄腈或2-(溴甲基)苄腈与氟肟标签连接,得到芳基肟中间体,然后将其进行环化,同时在酸性条件下将底物标签裂解,从而提供所需的产物,中等至中等产量。另外,可以使芳基肟中间体进一步反应以扩展化合物库。可以使用氟固相萃取(F-SPE)轻松分离产物,回收的氟酮可以转化回氟肟,并在下一轮合成中重复使用。
Electrooptic chromophores with large optical birefringence for applications at high speed and short wavelengths
申请人:McGinniss D. Vincent
公开号:US20060106262A1
公开(公告)日:2006-05-18
Disclosed is a series of materials, which exhibit large birefringence under the influence of an applied electric field. These materials are capable of switching this large birefringence with a characteristic time on the order of 1 microsecond or less. In addition, these materials have good optical loss at this wavelength, and are stable under irradiation. These materials are suitable for fabrication of optical devices such a variable optical attenuators, switches, and modulators that respond in these time frames or slower. These materials are also suitable for use across a wide range of wavelengths. As a second component of this invention, some of these novel materials exhibit these desired optical properties (large birefringence, low loss, stability under illumination) at wavelengths as short as about 400 nm. These materials are suitable for fabrication of optical devices operating at or about 405 nm, where conventional EO materials strongly absorb and/or quickly degrade.