foerfarande foer framstaellning av alkyl - eller aralkyltio - 2 - cykloalken - 1 - karboxamider - 1 och deras sulfoxider och foer anvaendning av dem som mellanprodukter vid syntes av dr - och tetrametylen - 4,5 - isotiazolin - 4 - oner - 3.

摘要

A process for preparing a 4,5-tri or tetramethylene-4-isothiazoline-3-one comprises cyclizing a 2-alkyl or aralkyl thio-1-cycloalkene-1-carboxamide in the form of its sulfoxide in an organic solvent in the presence of a acid chloride and adding to the resulting 4,5-tri or tetramethylene-4-isothiazoline-3-one hydrochloride a mineral or organic base or water so as to free the 4,5-tri or tetramethylene-4-isothiazoline-3-one in the form of a free base.