Orada bir sürü yaratık çeşidi gözlemledi.
- He observed many types of creatures there.
Çocuk bütün gün kuşları gözlemledi.
- The boy observed the birds all day.
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.