Definition of thionyl in English:

thionyl

noun

Chemistry
  • as modifier Of or denoting the divalent radical SO.

    ‘thionyl chloride’
    • ‘The methyl halide can be produced by reacting methanol with phosphorous halides, hydrogen halides, or, in the case of methyl chloride, thionyl chloride.’
    • ‘One milliliter of dry methanol was chilled on dry ice and 0.25 mL thionyl chloride added slowly.’
    • ‘Schedule 3 comprises a number of toxic or precursor chemicals with widespread industrial uses, such as phosgene, hydrogen cyanide, phosphorus trichloride and thionyl chloride.’
    • ‘An excess of the dry commercially available alcohol was cooled to 0°C, and freshly distilled thionyl chloride was added.’
    • ‘The resulting ester was saponified under basic conditions to the free acid, converted to the acyl chloride with thionyl chloride, and then to the amide with anhydrous ammonia gas.’

Origin

1857: so named by H. Schiff (see Schiff base).

Pronunciation

thionyl

/ˈθʌɪənɪl//ˈθʌɪənʌɪl/