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In our previous report if the temperature was lowered to -10 °C, the product could be isolated in 23% yield even after 72 h
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In our previous report if the temperature was lowered to -10 °C, the product could be isolated in 23% yield even after 72 h.
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note
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Other terminal alkynes such as trimethylsilylacetylene and 1-heptyne were also used, but with trimethylsilylacetylene no corresponding products were obtained while with 1-heptyne the corresponding products were obtained in moderate yields (from 64% to 73%) and lower ee (from 33% to 50%).
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