Preparation and synthetic utility of fluorinated phosphonium salts, -phosphonium salts and phosphoranium salts [1]
作者:Donald J. Burton
DOI:10.1016/s0022-1139(00)81218-x
日期:1983.10
fluorohalomethanes provides a rapid and high yield synthesis of various types of fluorinated phosphonium salts, bis-phosphonium salts and phosphoranium salts. These salts are useful precursors to fluorine-containing ylides, carbenes and methide ions. Examples of the preparation, mechanism of formation, and syntheticutility of these novel reagents is described.
Chemoselective halogenation of 2-hydroperfluoroalkyl aldehydes
作者:Donald A. Wiebe、Donald J. Burton
DOI:10.1016/j.jfluchem.2012.03.013
日期:2012.7
2-Hydroaldehydes, RfCH(R)CHO, where Rf = CF3, C2F5, n-C3F7 and R = CF3, C2F5, n-C3F7, Ph, H, were prepared via acid hydrolysis of the corresponding vinyl ethers, RfC(R) = CHOCH3, which can be readily prepared by reaction of [Ph3P+C¯HOCH3] with the corresponding ketone. The 2-hydroaldehydes can be chemoselectively converted to the acyl halide, RfCH(R)C(O)X (X = Cl, Br), via free-radical halogenation
2-羟基醛,R f CH(R)CHO,其中R f = CF 3,C 2 F 5,n -C 3 F 7和R = CF 3,C 2 F 5,n -C 3 F 7,Ph, H,制备通过相应的乙烯基醚的酸水解,R ˚F C(R)= CHOCH 3,其可通过的反应容易地制备[博士3P+C¯霍奇3]与相应的酮。可以通过自由基卤化将2-氢醛化学选择性转化为酰基卤R f CH(R)C(O)X(X = Cl,Br)。全氟烷基使2-位失活,成为2-氢的自由基夺取基团,卤化仅发生在甲酰基氢上。但是,冰乙酸中的2-氢醛的卤代化学选择性地产生了2-卤醛,R f CX(CHO)CHO,X = Cl,Br。2-氢全氟酰基卤的水解提供了有用的途径来获得2-氢全氟烷基支链的羧酸,有用的乙烯酮前体。该途径避免了使用有毒的氟代烯烃,例如全氟异丁烯。
Process for preparing acylfluorides
申请人:SOLVAY SOLEXIS S.p.A.
公开号:US20030236436A1
公开(公告)日:2003-12-25
A process for preparing acylfluorides by reaction of carbonyl fluoride COF
2
with compounds having general formula:
T=CR
1
R
2
(I)
wherein:
T is O or CF
2
R
1
and R
2
, equal or different, are F or a R(O)
t
radical,
wherein R=linear or branched C
1
-C
7
(per)fluoroalkyl, optionally containing one or more oxygen atoms,
t is an integer equal to zero or 1;
wherein a catalyst supported on porous compound is used, the catalyst being selected from: CsF, RbF, KF, AgF, each optionally in admixture with one or more of the others.
A method for the preparation of a fluorinated ketone of the formula: ##STR1## where R.sub.1 and R.sub.2 are independently fluorine, alkyl of from about 1 to about 8 carbon atoms, fluoroalkyl of from about 1 to about 8 carbon atoms, or ##STR2## where R.sub.3 and R.sub.4 are independently fluorine, alkyl of from about 1 to about 8 carbon atoms, or fluoroalkyl of from about 1 to about 8 carbon atoms and n is 0 or 1. The method includes heating an anhydride of the formula: ##STR3## with a catalyst including a cationic salt of a fluorocarboxylic acid or an alkali metal fluoride to obtain the fluorinated ketone.
Novel perfluoroketone compounds of formula [I] and [Ia] are described. Also described are uses thereof, such as for inhibition of phospholipase A
2
activity. Therapeutic uses thereof are also described, such as for the treatment of neural conditions and/or inflammatory conditions, such as demyelinating (e.g., multiple sclerosis) and neural injury (e.g., spinal cord injury).