A series of aryl substituted phenyl and benzyl methyl sulphides has been oxidized to the corresponding sulphoxides by Mortierelln isnbrlli~~cr NRRL 1757. The oxygen atom introduced during this enzymic oxidation is derived from the atmosphere and not from water. The rates of oxidation have been determined by uvanalysis, and correlated with the Hammettp. sigmaconstants for the phenyl methyl sulphide series. The value of p = -0.67 so obtained is interpreted in terms of a mechanism of oxidation at sulphur involving an electrophilic attack on the sulphide sulphur by the enzymic activated iron-oxygen complex, followed by conversion of the resulting sulphur cation to sulphoxide.HERBERT L. HOLLAND et IAN M. CARTER. Can. J. Chem. 60, 2420Chem. 60, (1982. On a oxyde une sCrie de methylthio-benzknes et -phCnylmCthanes substituks en sulphoxydes correspondants a I'aide de la Mortierelln isabelli~~n NRRL 1757. L'atome d'oxygene introduit lors de cette oxydation enzymatique provient de I'atrnosphkre e t non de I'eau. On a determine les vitesses d'oxydation par I'analyse uv et on les a relie aux constantes sigmap de Hammett, dans le cas des mCthylthiobenzknes. On interprkte la valeurde p = -0,67 ainsi obtenue en fonction d'un mkcanisme d'oxydation au niveau du soufre irnpliquant une attaque Blectrophile sur le soufre du sulfure par un complexefer-oxygkne active enzy matiquement, suivi de la transformation sur cation soufre resultant en sulphoxyde.[Traduit par le journal]The enzymic oxidation of sulphides to sulphox-

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Journal of Control, Automation and Electrical Systems. He has published more than 400 papers in congress proceedings and international journals and authored several book chapters.

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