observed

Verb

 * Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich
 * 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.
 * 1) (of a holiday) Exceptionally celebrated on a date other than the usual date.
 * Sunday, July 1: Canada Day; Monday, July 2: Canada Day observed.
 * Sunday, July 1: Canada Day; Monday, July 2: Canada Day observed.