Observed

Verb

  • simple past tense and past participle of observe

    "Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-AldrichN-substituted pyrroles are much less reactive than the other 5-membered 1,3-dienes; no reaction was observed between N-(trimethylsilyl) pyrrole or N-benzylpyrrole with Smith’s diene (4) under thermal or high pressure (4 days at 14 kbar) conditions, even in the presence of Lewis acids."

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