Substituted systems thermal expansion

Wandekar, R.V. Wani, B.N. Bharadwaj, S.R. (2009). Crystal Structure, Electrical Conductivity, Thermal Expansion and Compatibility Studies of Co-substituted Lanthanum Strontium Manganite System Solid State Science, Vol. 11, No. 1, 0anuary 2009), pp. 240-250, ISSN 1293-2558... 

Synthesis From Other Ring Systems. These syntheses are further classified based on the number of atoms in the starting ring. Ring expansion of dichlorocyclopropane carbaldimine (53), where R = H and R = ryl, on pyrolysis gives 2-arylpyridines. Thermal rearrangement to substituted pyridines occurs in the presence of tungsten(VI) oxide. In most instances the nonchlorinated product is the primary product obtained (63). 

Cyclopropanation of tricarbonyl(tropone)iron 18 via cycloaddition of diazomethane, diazoethane or diazopropane and thermal dinitrogen extrusion gave bicyclo[5.1.0]octadienone ( homotropone ) complexes which decomposed to form the free ligand 20 in high yield. When the same procedure was applied to the free ligand 16, a substituted cyclooctatrienone system 17 was obtained via ring expansion. 

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