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47
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41149110620
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See the proposed mechanism in Scheme 2
-
See the proposed mechanism in Scheme 2.
-
-
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48
-
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41149148638
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-
With dichloro acetyl chloride as the ketene precursor, the desired product 3r was not detected
-
With dichloro acetyl chloride as the ketene precursor, the desired product 3r was not detected.
-
-
-
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49
-
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41149132847
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-
For the examples in entries 4-9, Table 4, ketene was found to react with the activated alkyne to form some volatile unidentified products.
-
For the examples in entries 4-9, Table 4, ketene was found to react with the activated alkyne to form some volatile unidentified products.
-
-
-
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50
-
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41149131254
-
-
The structure of compound 7 was unambiguously confirmed by single-crystal X-ray diffraction, see the Supporting Information.
-
The structure of compound 7 was unambiguously confirmed by single-crystal X-ray diffraction, see the Supporting Information.
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51
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57
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41149152895
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-
The structure of compound 11 was unambiguously confirmed by single-crystal X-ray diffraction; see the Supporting Information.
-
The structure of compound 11 was unambiguously confirmed by single-crystal X-ray diffraction; see the Supporting Information.
-
-
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58
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0036263839
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For reviews on the Diels-Alder reaction, see: a
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