Big Chemical Encyclopedia

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

Articles Figures Tables About

Spirocyclic sulfur system

With excess HFA a dioxolaneimine 99a is formed from a typical isonitrile reaction mentioned in previous sections. Acidification yields the unsubstituted five-membered ring 99, which is the parent compound of alkylated dioxolanes 99b-e available from isonitriles (R = Me, Et, t-Bu, c-CgHu) 111, 188). Whether the imine structure 99 or the ketone structure 101 has to be assigned to the hydrolysis product is not known. The Chapman rearrangement has been proved in the following system [Eq. (86)] 190). Treatment of 98 with strong bases like l,8-diazabicyclo[5.4.0]undec-7-ene (DBU) yields a spirocyclic compound 100 with elimination of HCN the structure of 100 has been derived by spectroscopic methods 193). The reaction of 98 with HFA X HjO (91) in sulfuric acid produces a l,3-dioxolan-(4)one 112). [Pg.265]


See other pages where Spirocyclic sulfur system is mentioned: [Pg.269]    [Pg.41]    [Pg.266]    [Pg.275]    [Pg.281]    [Pg.266]    [Pg.16]    [Pg.4]   
See also in sourсe #XX -- [ Pg.269 ]




SEARCH



Spirocycle

Spirocycles

Spirocyclic

Spirocyclization

Spirocyclizations

Sulfur system

© 2024 chempedia.info