Synthesis of 1,1-bisphosphono-2-aza-1,3-dienes, a new class of electron-deficient azadienes
摘要:
1,1-Bisphosphono-2-aza-1,3-dienes are formed by 1,4-dehydrohalogenation of the corresponding N-(bis-phosphonomethyl)-alpha-haloimines in moderate to good yields. The precursors could be formed by condensation of bisphosphono-amines and the corresponding alpha-haloaldehydes. (C) 2008 Elsevier Ltd. All rights reserved.
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。
straightforward flow synthesis of α-chloro aldehydes has been developed. The strategy involves, for the first time, the thermal unstable chloroiodomethyllithium carbenoid and carbonyl compounds. A batch versus flow comparativestudy showcases the superb capability of flow technology in prolonging the lifetime of the lithiated carbenoid, even at -20 °C. Remarkably, the high chemoselectivity realized in flow
申请人:OCCIDENTAL CHEMICAL CORPORATION, Occidental Tower
公开号:EP0916641A1
公开(公告)日:1999-05-19
In a method of making an acid chloride having the general formula
where each R contains no unsaturated groups and is preferably independently selected from aliphatic from C1 to C7 and aryl from C6 to C15, a solution is formed in an inert solvent of an aldehyde having the general formula
and chlorine gas is sparged into said solution. The reaction between the aldehyde and the chlorine gas to produce the acid chloride is performed in the absence of a catalyst, in the absence of an initiator, and in the absence of ultraviolet light. A chlorinated acid chloride can be prepared from the acid chloride by reacting it with additional chlorine in the presence of a chlorine free radical generator.
Alpha-dicarbonyl compounds 7-12 can be easily prepared by reaction of methylene chloride solutions of several alpha-substituted arylacetaldehydes 1-6 with a slight excess of tris-(o,p-dibromophenyl) ammoniumyl hexachloro antimonate A.
Nitrosation Reactions of Primary Vinylamines. Possible Divalent Carbon Intermediates<sup>1</sup>
作者:David Y. Curtin、J. A. Kampmeier、Brian R. O'Connor