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(E)-3-Thioxospiro[chroman-2,1ʹ-cyclohexane]-4-one S-(1-adamantylimide) (1) reacted with numerous nitrilimines (generated in situ via triethylamine dehydrohalogenation of the corresponding hydrazonoyl chlorides -  i ) in refluxing dry toluene to afford 3ʺ,5ʺ-disubstituted-300H,4ʹHdispiro[ cyclohexane-1,2ʹ-chromene-3ʹ,2ʺ-[1,3,4]thiadiazole]-4ʹ-ones  3a  -  i . Similarly, reaction of 2,2-dimethyl-3-thioxochroman-4-one S-(1-adamantylimide) (4) with nitrilimines in refluxing dry toluene afforded the corresponding 3ʹ,5ʹ-disubstituted-3,3-dimethyl-3ʹH,4H-spiro[chromene-3,2ʹ- [1,3,4]thiadiazole]-ones  5a  -  i .

Reactions of 2,2-Dialkyl-3-thioxochroman-4-one S-(1-Adamantylimides) with Some Nitrilimines