Structure and Isomerism

LaForge FB, Barthel WF (1945) Constituents of pyrethrum flowers XVIII. The structure and isomerism of pyrethrolone and cinerolone. J Org Chem 10 114-120... 

Contents Introduction. - X-Ray Difraction. -Conformational Analysis. - Structure and Isomerism of Optically Active Complexes. - Electron-Density Distribution in Transition Metal Complexes. - Circular Dichroism. - References. 

Uccella, N.A. Howe, I. Williams, D.H. Structure and Isomerization of Gaseous [C3H8N] Metastable Ions. J. Chem. Soc., B1971, 1933-1939. 

The structures and isomerization of C4Hg+ ions in connection with the problem of ethylene clusters has been the subject of many studies. Doepker and Ausloos192 studied the photolysis of cyclobutane, its deuterated isotopomer and mixtures thereof, and in their detailed product analysis they found cA-2-butene, trans-2-butene and 1-butene as major ionic products in the approximate ratio of 1 1 2. Lias and Ausloos193 determined... 

A synthetic survey embracing all these structural and isomeric features cannot be attempted here, and the discussion is restricted to the allylic alcohols. 

Cg4 are known, but their structures and isomeric compositions have yet to be determined. ... 

Is it possible to explain the handedness, nuclear structure, and isomerism of molecular species ... 

FIGURE 3.14 Chemical structures and isomerization of (top) diarylethene and (bottom) spiropyran isomers. 

Molecular shapes VSEPR (C2) Complexes, structure and isomerism (H6)... 

If we assume that the Bragg model represents accurately the true shape and size of the molecule, the following conclusion, which is of importance for the theory of structure and isomerism, may be drawn Only those compounds can exist which obey the laws of space requirement outlined above, that is, which can be represented without strain by the Bragg molecular models. We arrive at the fact that two carbon atoms, united by primary valences, may not be separated by any distance greater than 1.2-1.6 A, a requirement which places definite limitations on the bridge bonds frequently formulated in organic chemistry. 

Most complex ions containing Co, Cr, and Pt are kineticaUy inert. Because they exchange ligands very slowly, they are easy to smdy in solution. As a result, our knowledge of the bonding, structure, and isomerism of coordination compounds has come largely from smdies of these compounds. 

The C-chain length of the -parafflns used for the LAB production directly affect the molecular weight of the resulting alkylate, whereas the different catalysts are responsible for the structure and isomeric composition of the final LAB. 

---