[反应:参见正文]使用1-氯甲基-4-氟-1,4-二氮杂双环[2.2.2]辛烷双(四氟硼酸酯)(Selectfluor F -TEDA-BF4)。因此,将2-萘酚和2-甲氧基萘转化为1,1-二氟-2(1H)萘酮,将雌酮转化为10β-氟-1,4-雌二醇-3,17-二酮,将苯基取代的烯烃转化为邻位氟代醇,和各种酮,1,3-二酮或β-酮酸酯,以形成相应的α-氟或α,α-二氟酮。
N-Fluoropyridinium salts provide a new system of fluorinatingagents by which a wide range of nucleophilic substrates differing in reactivity can be fluorinated due to the varying degree of fluorinating power and also fluorinated very selectively through structural alteration. The scope of selective fluorination should be broadened considerably on the basis of the present results. The N-fluoropyridinium
Decarboxylative Fluorination of Arylcarboxylic Acids Promoted by <i>ortho</i>
-Hydroxy and Amino Groups
作者:Dinghai Wang、Zheliang Yuan、Qilun Liu、Pinhong Chen、Guosheng Liu
DOI:10.1002/cjoc.201800016
日期:2018.6
A novel decarboxylative fluorination process has been developed for the synthesis of ortho‐hydroxy/amino arylfluorides from salicylic acid analogs, in which the ortho‐hydroxy/amino group plays an important role in the transformation. In addition, various arylfluorides are obtained in good to excellent yields under mild conditions.
The first recyclable polymer‐supported electrophilic fluorinating agent was prepared by reaction of molecular fluorine with the triethylenediamine motif that is grafted onto a poly(4‐vinylbenzyl chloride‐co‐divinylbenzene) polyHIPE material. The resulting polymeric SelectfluorTM‐type reagent demonstrated high efficiency in the fluorination of naphthol in the course of repeated sequences of fluorination
BENZO[F]CHROME ANY PYRANO[3,2-F]CHROME DERIVATIVES FOR USE IN LIQUID CRYSTAL MEDIA
申请人:Jansen Axel
公开号:US20110043746A1
公开(公告)日:2011-02-24
The present invention relates to benzo[f]chromene and pyrano[3,2-f]-chromene derivatives of the formula I
in which
L
1
, L
2
, R
1
, R
2
, A
1
, A
2
, Z
1
, Z
2
, m and n are as defined in claim
1,
to the preparation thereof, to the use thereof as components in liquid-crystalline media, and to electro-optical display elements which contain the liquid-crystalline media according to the invention.
(MEC-31) was shown to be a highly reactive electrophilic fluorinating agent with the highest effective fluorine content in its class. We have developed the perfect recycled fluorinationsystem with MEC-31 for the lower-cost industrial fluorination and for an environment. MEC-31 can be completely recycled including the counter-anion. We found the fluorination of 2-naphthol in liquid CO2 with MEC-31 in