As steric hindrance of the aryl amine decreased and nucleophilicity increased, occurrence of the transfor-mation reaction increased and herbicidal activity of the product decreased.
芳胺空间位阻越小,亲核性越强,副反应越容易发生,产物除草活性越低。
Steric hindrance
英语例句库
中文百科
位阻效应 Steric effects
（重定向自Steric hindrance）
位阻效应（也叫空间效应、空间位阻效应、立体效应）是研究分子中不同基团间电子团重叠形成的电磁力而造成的分子结构或反应取向的立体化学分枝。广泛应用于有机化学中分子结构及反应机理的定性讨论，但在有些情况下可能导致偏差或谬误。
英语百科
Steric effects 位阻效应
（重定向自Steric hindrance）
![Regioselective dimethoxytritylation of the primary 5'-hydroxyl group of thymidine in the presence of a free secondary 3'-hydroxy group as a result of steric hindrance due to the dimethoxytrityl group and the ribose ring (Py = pyridine).[3]](/uploads/202502/13/Regioselective_tritylation3451.png)
- See also: intramolecular forces
Steric effects arise from a fact that each atom within a molecule occupies a certain amount of space. If atoms are brought too close together, there is an associated cost in energy due to overlapping electron clouds (Pauli or Born repulsion), and this may affect the molecule's preferred shape (conformation) and reactivity.
- factor complementarity的意思
- factor complex的意思
- factor component of trade的意思
- factor confusion的意思
- factor congruence的意思
- Factor Construct Rating Scales的意思
- factor content of trade的意思
- Factor,Cord的意思
- Factor cost的意思
- factor cost method的意思
- factor cost value的意思
- factor covariance matrix的意思
- factor covering的意思
- Factor D的意思
- Factor D,Complement的意思
- Factor D complement component的意思
- factor D deficiency的意思
- factor demand的意思
- Factor,Demographic的意思
- factor design的意思
- Factor,Differentiation Reversal的意思
- Factor,Discretionary Adjustment的意思
- factordom的意思
- factor D,properdin的意思
- factor的意思