2,2,3,3-tetramethyloxirane

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Analogously to Example 1, the required 2,2,3,3-tetramethyl-2,3-dihydro-4H-1,4-benzothiazine is obtained as a colourless oil having a boiling point of 89° C./0.04 mbar using 2-(2-hydroxy-1,1,2-trimethylpropylthio)-aniline, melting point of from 60° to 62° C., boiling point of 125° C./0.1 mbar (obtained from tetramethyloxirane and 2-aminothiophenol). nD20 =1.5955; the mass spectrum shows a molecular ion at 207 (74% relative intensity) and as main fragments 192 (24%), 177 (14%), 164 (100%), 150 (44%), 132 (70%), 125 (24%), 109 (15%), 92 (22%), 42 (17%) and 41 (16%).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Analogously to Example 1, the required 2,2,3,3-tetramethyl-2,3-dihydro-4H-1,4-benzothiazine is obtained as a colourless oil having a boiling point of 89° C./0.04 mbar using 2-(2-hydroxy-1,1,2-trimethylpropylthio)-aniline, melting point of from 60° to 62° C., boiling point of 125° C./0.1 mbar (obtained from tetramethyloxirane and 2-aminothiophenol). nD20 =1.5955; the mass spectrum shows a molecular ion at 207 (74% relative intensity) and as main fragments 192 (24%), 177 (14%), 164 (100%), 150 (44%), 132 (70%), 125 (24%), 109 (15%), 92 (22%), 42 (17%) and 41 (16%).