排序方式： 共有45条查询结果，搜索用时 15 毫秒
1.
G Nagendrappa 《Resonance》2005,10(8):80-90
Free radical synthetic methodology has grown by leaps and bounds in just about two decades. The limit to which the scope of
free radical synthesis can go is restricted only by the imagination of the synthetic chemist. It greatly simplifies a synthetic
sequence, makes use of readily available, relatively inexpensive reactants and reagen-ts; the transformations are selective,
involve fewer steps, the yields are good, the reaction conditions are mild, etc. Therefore, such free radical reactions truly
qualify to be called “Green Chemistry”. 相似文献
2.
3.
4.
5.
G. Nagendrappa 《Resonance》2010,15(2):124-130
Electronic effects are important directing forces in the course of chemical reactions. Small differences in these effects
can bring about considerable changes in the results of very similar reactions. Thus, although the ambident nucleophiles urea,
ophenylenediamine and dibenzyl ketone are expected to take comparable double condensation pathway in their respective reaction
with benzil, urea reacts differently by causing benzil-to-benzilic acid type rearrangement. This is attributed to the reduced
availability of the lone pair of electrons on nitrogen in urea that is needed for assisting the dehydration of the intermediate. 相似文献
6.
G Nagendrappa 《Resonance》2007,12(5):21-30
J H van’ t Hoff is considered as one of the greatest chemists of all time. He started his career as an organic chemist. He
solved the vexing problem of optical isomerism by proposing an asymmetric tetrahedral carbon bonded to form different groups.
He extended this to include geometric isomerism, and to compounds with heteroatoms in place of asymmetric carbon. Thus he
established the ‘chemistry in space’ or stereochemistry. He moved on to work on reaction kinetics, equilibria, thermodynamic
properties of dilute solutions and related areas. He laid the foundation for physical chemistry through these discoveries
and was awarded the first Nobel Prize in Chemistry in 1901. van’ t Hoff died of tuberculosis at a relatively early age of
59. 相似文献
7.
8.
9.
10.