S,S-Diaryl-S-fluorothiazynes, Ar2SF(≡N), were prepared by the reaction of S,S-diaryl-N-bromosulfilimines with tetrabutylammonium fluoride. The thiazyne structure was assigned by the spectral data, physical properties, and is consistent with reactions with sodium alkoxides and primary amines. The thiazyne prepared previously by Clifford et al. is doubtful.

Alkyliminodiacetate is a surfactant recently developed for toiletry application. The solution properties of alkyliminodiacetate were examined by measuring the Krafft point, surface tension of the surfactant solution, foaming power, wetting ability and Ca tolerance. The relation between there properties and surfactant structure was sought by comparing the results of alkyliminodiacetate with different length of alkyl chain, alkylaminoacetate, alkylaminopropionate and alkyliminodipropionate. Clarification was made of the following ; 1) the Krafft point of alkyliminodiacetate is much lower than that of alkylaminoacetate, 2) alkyliminodiacetate is more hydrophilic than alkylaminoacetate, 3) the foaming power of alkyliminodiacetate is sufficient, 4) the wetting ability of alkylimino-diacetate increases with length of the alkyl chain, 5) the Ca tolerance suggests the mechanism of chelating metals of disodium alkyliminodiacetate to differ from that of monosodium alkyliminodiacetate.

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