1,2-Butanedithiol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: The procedure of Example 1 (a) is repeated, using 1,2-butanedithiol and 3-chloro-2-butanone to give 2-ethyl-2,3-dihydro-5,6-dimethyl-1,4-dithiin as a colorless oil, bp 68°-81°/0.7, yield 35%, NMR 1.01 (3t), 1.4-2.9 (2m), 1.87 (6s), 2.6- 3.4 (3m). IR, 2910 (sh); 1610 (sh); 1410, 1220 (sh); 1155 (sh); 1070, 735, 700.

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

Procedure: Butyroin (12.2 g), butane-1,2-dithiol (14.4 g) and p-toluenesulfonic acid (0.5 g) were dissolved in toluene (50 g) and the solution refluxed under a Dean-Stark trap. It was worked up as in Example 3 to give 2-ethyl-2,3-dihydro-5,6-dipropyl-1,4-dithiin as a clear greenish liquid, boiling range 92°-105°/0.025 mm, yield 8.5 g (44%). NMR(CDCl3), 0.78-1.14 δ (overlapping triplets), 1.21-1.80 δ (multiplet) 2.07-2.37 δ (complex quartet), 2.6-3.4 δ (multiplet). the solution refluxed under a Dean-Stark trap

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

Procedure: The procedure of Example 1(a) is repeated, using 1,2-butanedithiol and 3-chloro-2-butanone to give 2-ethyl-2,3-dihydro-5,6-dimethyl-1,4-dithiin as a colorless oil, bp 68°-81°/0.7, yield 35%, NMR 1.01 (3t), 1.4-2.9 (2m), 1.87 (6s), 2.6-3.4 (3m). IR, 2910 (sh); 1610 (sh); 1410, 1220 (sh); 1155 (sh); 1070, 735, 700.

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

Procedure: The procedure of Example 1(a) is repeated, using 1,2-butanedithiol and 3-chloro-2-butanone to give 2-ethyl-2,3-dihydro-5,6-dimethyl-1,4-dithiin as a colorless oil, bp 68°-81°/0.7, yield 35%, NMR 1.01 (3t), 1.4-2.9 (2m), 1.87 (6s), 2.6-3.4 (3m). IR, 2910 (sh); 1610 (sh); 1410, 1220 (sh); 1155 (sh); 1070, 735, 700.