
Chemistry Letters p. 663 - 666 (1989)
Update date:2022-08-05
Topics:
Ishida, Masaru
Aoyama, Takamichi
Kato, Shinzi
5-Phenylthio-1,3-cyclopentadiene reacted with maleic anhydride to give a 4:6 mixture of syn- and anti-attack adducts.In contrast, the selenium isologue, 5-phenylseleno-1,3-cyclopentadiene reacted with dienophiles with remarkable anti-?-facial selectivity
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