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1.3.2- Oxathiazoles, mesoionic

Oxathiazoles are known solely in the form of mesoionic l,3,2-oxathiazol-5-ones prepared first by Gotthardt by nitrosation of a-thiolcarboxylic acids (Scheme 13) <84CHEC-I(6)914>, the only reported method up to now. [Pg.452]

Rate constants for the first-order decay of nitrile sulfides have been estimated by means of flash photolysis of thiatriazoles and mesoionic oxathiazoles and the results used to calculate activation parameters (79JCS(Pl)960). [Pg.586]

The triphenyl compound (150 X=S, R = Ph) has been prepared in high yield by phosphorus pentasulfide-pyridine treatment of the dibenzoyl isothiazole (149 X = S, R = Ph) (77HC(30)317, 79CB260). The isothiazole precursor has been obtained from the mesoionic l,3,2-oxathiazol-5-olate (148 X = S, R = Ph) by treatment with either dibenzoylacetylene (79CB260) or dibenzoylethylene (77HC(30)317). [Pg.1043]

Preparation. - Benzocyclopropene reacts with the mesoionic oxathi-azolone (408) to give the 10 it electron system (409)4J The disubstituted sulphur diimides R CON=S=NCOR (R =Ph,Ar) combine with activated methylene compounds CH (C0R)o[R=Ac,Bz,RR=CH--CHMe CI ] to form 1,3,4-oxathiazoles (410) in 85—100% yield... [Pg.208]

See other pages where 1.3.2- Oxathiazoles, mesoionic is mentioned: [Pg.721]    [Pg.721]    [Pg.721]    [Pg.721]    [Pg.721]    [Pg.721]    [Pg.721]    [Pg.721]    [Pg.721]    [Pg.420]    [Pg.721]    [Pg.264]    [Pg.449]    [Pg.264]    [Pg.449]    [Pg.903]    [Pg.907]    [Pg.909]    [Pg.914]    [Pg.918]    [Pg.919]    [Pg.919]    [Pg.538]    [Pg.608]    [Pg.721]    [Pg.903]    [Pg.907]    [Pg.909]    [Pg.914]    [Pg.918]    [Pg.919]    [Pg.919]    [Pg.721]   
See also in sourсe #XX -- [ Pg.19 , Pg.37 , Pg.71 , Pg.91 ]



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1.3.5- Oxathiazole

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