Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Sulfonate group intramolecular displacement

Thiazetidine 1,1,-dioxides ((3-sultams) 67 were directly synthesised from pentafluorophenyl (PFP) isoxazolidine-4-sulfonates 66 under mild reducing conditions [Mo(CO)6, MeCN, H20, reflux]. The process is stereoselective and goes through N-O bond cleavage followed by intramolecular displacement of the PFP group by the amine <06OL5513>. [Pg.295]

Cyclization of allylic sulfones In the presence of aluminum chloride, allylic sul-fones can undergo intramolecular cyclization of the Friedel-Crafts type with displacement of the sulfone group. Examples are the cyclization of 1 and 4 to 2 and 5. respectively. [Pg.27]

The selective nucleophilic displacement of one ortho nitro group from 2,4,6-trinitrotoluene by esters of mercap-toacetic acid followed by oxidation leads to 2-(alkoxycarbonyl)methylsulfonyl compounds. These sulfones react with aromatic aldehydes under Knoevenagel conditions to produce thiochroman 1,1-dioxides 477, probably via a stilbene and a subsequent intramolecular Michael addition. Activating groups other than nitro are compatible with the route (Scheme 167) <2003RJ0397>. [Pg.889]

In the sulfonation of polyalkylbenzenes, an intramolecular rearrangement of an alkyl group may occur (see p 9). Similarly during the chlorosulfonation of polyalkylbenzenes, alkyl groups are sometimes displaced from the aromatic nucleus. [Pg.19]


See other pages where Sulfonate group intramolecular displacement is mentioned: [Pg.125]    [Pg.126]    [Pg.130]    [Pg.376]    [Pg.298]    [Pg.828]    [Pg.372]    [Pg.22]    [Pg.110]    [Pg.141]    [Pg.150]    [Pg.168]    [Pg.169]    [Pg.175]    [Pg.8]    [Pg.482]    [Pg.1086]    [Pg.37]    [Pg.396]    [Pg.705]    [Pg.705]    [Pg.260]    [Pg.293]    [Pg.279]    [Pg.37]    [Pg.925]    [Pg.47]    [Pg.491]    [Pg.159]    [Pg.53]    [Pg.867]    [Pg.92]    [Pg.107]    [Pg.577]    [Pg.227]    [Pg.690]    [Pg.10]    [Pg.39]    [Pg.313]    [Pg.140]    [Pg.63]   
See also in sourсe #XX -- [ Pg.125 , Pg.126 , Pg.127 , Pg.128 , Pg.129 , Pg.130 ]




SEARCH



Displacement intramolecular

Displacement sulfonate

Sulfonate group

Sulfone Displacement

Sulfone groups

Sulfonic group

© 2024 chempedia.info