Component fragmented

The dissection of the CH2XH system into component fragments, A and B, is depicted below for the W conformation. 

Fragment constant The partition coefficient is expressed as the sum of its component fragments log P=([jj an-fn where (a) is the number of fragment (f) of type (n) in the molecule Adjustment for steric effects, bond type and different interactions gives a complex calculation usually accomplished with computer software... 

The LUMO energy minima indicate the points of greatest overlap between the component fragments. They occur when one of the o bonds lies parallel to the n... 

Till recently progress has been made with double alkaloids only when they could be split into their component fragments. Even then the... 

In the second method, a stable density gradient is formed in a tall container by introducing a mixture of the two liquid components. As the container is filled, the density of the liquid mixture is decreased by altering the proportions of the components. Fragments of glass are added to the column of liquid and will sink to a position at which the liquid has the same density as the glass. Standards of known density are added to the column and the densities of the glass under test can be obtained by interpolation. An accuracy of 0.5 mg ml is typically achieved. 

Having understood exactly how valence state reversal can be effected in four electron-four orbital systems, we can use the same concepts in analyzing the valence state manifolds of polyelectronic systems. This is illustrated by a comparative study of the electronic states of C2 and Si2. The choice is deliberate since C2 is inherently interesting in that it is one of the simplest organic molecules and a component fragment of a great many organic molecules. Also, the... 

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