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Halogenation Halogenation O 0235Development of Direct Fluorination Technology for Application to Materials for Lithium Battery. -An efficient method for the direct monofluorination of dioxolan-2-one (I) using elemental fluorine and the further transformation of the so obtained 4-fluorodioxolanone (II), which is expected to be an effective additive for lithium battery electrolyte, into difluorinated 1,3-dioxolan-2-ones (III)-(V) by the same procedure is described. Moreover, the preparation of trifluoromethanesulfonyl fluoride (VII), an important intermediate of lithium salts used as electrolyte in lithium ion secondary battery, by a similar direct fluorination reaction is given. -(KOBAYASHI*, M.; INOGUCHI, T.; IIDA, T.; TANIOKA, T.; KUMASE, H.; FUKAI, Y.; J. Fluorine Chem. 120 (2003) 2, 105-110; New Mater. Lab., New Prod. Dev. Div., Kanto Denka Kogyo Co. Ltd., Gunma 377, Japan; Eng.) -M. Kowall 26-057