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85030193566
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Synthetic Exploitation of the Ring-opening of 3,4-Dinitrothiophene Part 6. Part 5, see ref. 7c.
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85030193674
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note
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6b for the analogous preparations of dinitrobutadienes 2, allowing the dichloromethane extracts to stand several hours at room temperature before workup generally ensures a complete stereomutation of some formed (E,Z)-and (Z,Z)-products into the more stable (E,E)-isomer. Actually, for 1,4-diaryl-substituted 2 such stereomutation goes to completion in 1-2 h. In the case of the 1,4-dialkyl analogues several hours are necessary; moreover when bulky substituents are present (as cyclohexyl in 2k abd sec-butyl in 2j) some (E,Z)-isomer remains in the final reaction mixture.
-
-
-
-
45
-
-
85030186366
-
-
note
-
6
-
-
-
-
46
-
-
85030189767
-
-
note
-
23 stereochemical assignments take also account of the high deshielding observed for the nitrovinylic protons in the (E,E) isomers and in the (E) portion of the (E,Z) isomers as compared to the same protons in the (Z) portion of the molecule.
-
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47
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0003688714
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Pretsch, E.1
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48
-
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85030192550
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note
-
It should be stressed that under the used conditions the methylation reaction usually requires 30-45 min to go to completion; longer reaction times were used in order to ensure (as independently ascertained on some samples isolated at shorter times) a complete stereomutation of 14 into the most thermodinamically stable isomer.
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