最終更新日：2024/07/28

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simple past tense and past participle of observe / (of a holiday) Exceptionally celebrated on a date other than the usual date.

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observed

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observed

/əbˈzɝvd/

verb

She observed the birds in the park.

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simple past tense and past participle of observe

N-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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