Selective One-Pot Synthesis of Allenyl Phenyl Selenide and 1-(Phenylseleno)Propyne. Role of Sodium Benzeneselenolate as a Base in Dmf

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• Even in the presence of an increasing amount of sodium p-meth-oxyphenylselenolate (1 eq), p-methoxypheriylseleno group was not incorporated into the products of type 4 and 5. Interestingly, sodium p-chlorophenylselenolate did not bring about the base-induced rearrangement (0.2 eq, 3 (1 eq), DMF-THF, room temperature, 1 hr), resulting in 75 % recovery of 3
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