既然富烯不显示环电流存在的迹象，所以质子的化学位移仍然发生在正常的链烯区。
Since fulvenes show no evidence of ring currents, the chemical shifts of the protons will be found in the normal definite region.
介绍海洋中长链烯酮研究最新进展的同时，着重阐述了湖泊中长链烯酮研究现状及存在的主要问题。
New progresses in the study of long-chain alkenones in the ocean are introduced. At the same time the paper also presents the progresses in the lacustrine field.
本发明涉及一种用于制备链烯基化的羟化芳族化合物、苯并二氢吡喃化合物和其酰化衍生物的方法。
The present invention relates to a process for the manufacture of alkenylated hydroxylated aromatic compounds, of chroman compounds and of their acylated derivatives.
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