Synthesis of Symmetric Diaryl Sulfones with Dimethyl Sulfate
作者:Mohammad Mehdi Khodaei、Ehsan Nazari
DOI:10.1246/cl.2010.390
日期:2010.4.5
In this procedure dimethyl sulfate was used for preparation of symmetric diarylsulfones. First, dimethyl sulfate was treated with pyridine, then activated by Tf2O to generate SO2 as the functional...
A series of aromatic sulfonic acids is synthesized by subjecting arenes and NaHSO4·H2O to high-speed ball milling in the presence of P2O5. It is suggested the aromatic sulfonation occurs via in situ generated H2SO4 to give aromatic sulfonic acids. In some cases, formation of diaryl sulfones was observed.
在P 2 O 5存在下,芳烃和NaHSO 4 ·H 2 O经高速球磨合成一系列芳香族磺酸。建议芳族磺化通过原位生成的 H 2 SO 4 发生以产生芳族磺酸。在某些情况下,观察到二芳基砜的形成。
A curable fluoroelastomer composition
申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:EP0182299A2
公开(公告)日:1986-05-28
A curable fluoroelastomer composition comprising:
(a) a fluoroelastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer;
(b) a curing accelerator comprising an iminium compound of the formula
wherein R1 is a substituted or unsubstituted aryl group, R2 is an alkyl or halogenated alkyl group, a cycloalkyl or halogenated cycloalkyl group, or a substituted or unsubstituted aralkyl group, and X is a halogen atom;
(c) a polyhydroxy compound as a cross-linking agent; and
(d) a metal compound selected from a divalent metal hydroxide, a divalent metal oxide or a mixture thereof.