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Principle of minimum structural change

According to this oversimplified principle, chemical species do not isomerize in the course of a transformation, e.g. substitution, or the change of a functional group of a chemical species into a different functional group is not expected to involve the making or breaking of more than the minimum number of bonds required to effect that transformation. For example, any new substituents are expected to enter the precise positions previously occupied by displaced groups.[1] Molecular rearrangements[2]  violates the so-called 'principle of minimum structural change'. References:  IUPAC Goldbook, doi:10.1351/goldbook.M03997 The term is traditionally applied to any reaction that involves a change of connectivity (sometimes including hydrogen)

Abegg's rule

Abegg's rule states the sum of the absolute values of the maximum positive and negative valence of an atom is often equal to eight .   Abegg’s rule is sometimes referred to as "Abegg’s law of valence and countervalence". for a given chemical element (as sulfur) Abegg’s rule states that the sum of the absolute value of its negative valence (such as −2 for sulfur in H 2 S ) and its positive valence of maximum value (as +6 for sulfur in H 2 SO 4 ) is often equal to 8. The rule used a historic meaning of valence which resembles the modern concept of oxidation state in which an atom is an electron donor or receiver. Abegg, Richard Wilhelm Heinrich January 9, 1869 – April 3, 1910 Danish chemist, major work on chemical valence Trained as organic chemist (student of August Wilhelm von Hofmann at the University of Berlin); but practiced  physical chemistry with Friedrich Wilhelm Ostwald in Leipzig, Germany Read More Abegg, R. (1904). "Die Valenz und das periodische Syste

Sir Chandrasekhara Venkata Raman, FRS

Sir Chandrasekhara Venkata Raman, FRS Sir Chandrasekhara Venkata Raman, FRS (7 November 1888 – 21 November 1970) was an Indian physicist whose work was influential in the growth of science. He was the recipient of the Nobel Prize for Physics in 1930 for the discovery that when light traverses a transparent material, some of the deflected light changes in wavelength. This phenomenon is now called Raman scattering and is the result of the Raman effect. The Raman papers archive curated by Raman Research Institute, Bangalore, India.  C.V. Raman and his work Read more at ACS the-raman-effect-commemorative-booklet Raman Effect as the Chemist’s Tool This article from wikipedia: Read more at wikipedia

Scenario of Indian science

Some selected articles on Indian research scenario: Chemistry:  Chemistry is central science. This article describe current state of research and teaching in India. Chemistry in India: unlocking the potential.  Angew. Chem. Int. Ed. 2013 , 52 , 114 – 117 Read it at   DST, India    Wiley   Readcube Science: Basic Science in India: From Education to Research, Nature Network Research output    Changing scenario of Indian science    Indian R&D Scenario by AV Ramarao

Chemists of India

 Chemists of India Here is an inspiring article about Prof. CNR Rao's  journey, accomplishments and a distinguished career.,+Scientist/1/100031.html     Read more about Famous Indian Chemists  

Learning Science

Learning Science - learn it with Dr C N Rao Home Page    of Professor Chintamani Nagesa Ramachandra Rao Learning Science Part-I Learning Science part-II Learning Science part-III Learning Science part-IV  

The Organic Reactions Wiki

  Organic Reactions A comprehensive resource which provides information about the most important and useful synthetic reactions, organized primarily by reaction type. It contains mechanism, scope, and limitations of reactions for each reaction type.  Based on this large work, there is freely accessible wiki which provides basic information about a reaction published in this collection. this can be accessed at