The alkylation of 3‐R′‐thio‐5‐amino‐1H‐1,2,4‐triazoles 1 or their sodium salt with alkyl and aralkyl halides 2, respectively, to yield all the four possible monoalkylated derivatives 3, 4, 5 and 6 was studied. The comparison of the spectral data of different type isomers 3, 4, 5 and 6 isolated and their Schiff bases 8, 9 and 10, respectively, was unequivocal evidence in support of their structure which was then further supported by independent synthesis and ring closure reactions. According to an hplc study the main product of the alkylation is derivative 3, the by‐product is derivative 4, while derivatives 5 and 6 are formed only in insignificant amounts.

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Kajthr and ~o -w o r k e r s -~ synthesized a series of spirodilactams with the aim of studying the spectroscopic properties of two amide chromophores fixed in different positions relative to one another in a molecular framework.Here we report on the electron impact induced fragmentation of six diazaspiro- [4,4]nonanedione isomers 1-3,' 4 : 5,' 63a complete series with N H -C O groups in each 5-membered ring-and, in addition, the fragmentation of a spiro [4,5]decane and a spiro[5,5]undecane homologue 7, and 8,3

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