Effect of substituents on thermal behavior of some symmetric double schiff’s bases containing a cardo group

1083-1087Thermal behavior of symmetric double schiff’s bases containing cardo group has been studied by TGA and DSC techniques at 10°C/min in nitrogen atmosphere. DSC transitions, thermal stability and kinetic parameters are affected by nature and position of substituents. Schiff’s bases are thermally stable between 173-272°C and followed either a single step or two steps degradation (fractional or integral order). Different magnitudes of n, E and A suggested different degradation mechanisms. A large and negative magnitudes of “S* confirmed highly ordered transition state, while positive magnitudes of “S* confirmed less ordered transition state

A cleaner approach for reduction of some symmetric diimines using NaBH4

438-442Symmetric diimines have been reduced to their corresponding amines by means of NaBH4 using THF as a solvent at room temperature. The reaction time and yield are 3-4 hr and 77-93%, respectively. Reduction process is very effective, inexpensive and clean for the synthesis of symmetric diamines in good yield. The structures of the compounds are supported by FTIR, mass spectrometry, ¹H and ¹³C NMR spectral dat

Ultrasonic speed, density, viscosity and associated acoustical parameters of chloroform solutions of symmetric double Schiff bases at 308.15K

ABSTRACT The density, viscosity and ultrasonic spee

Crystallographic analysis of 1,1’-bis (3-methyl-4-hydroxyphenyl) cyclohexane

346-350<span style="font-size:11.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-bidi-font-family:="" "times="" roman";mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:hi"="" lang="EN-GB">The crystal structure of <span style="mso-bidi-font-weight: bold">1,1’-bis(3-methyl-4-hydroxyphenyl) cyclohexane has been determined by X-ray crystallographic technique. The compound crystallized into monoclinic crystal lattice having space group P21/c with unit cell parameters, a = 15.023(2) Å, <i style="mso-bidi-font-style: normal">b = 9.924(2) Å, c = 11.620(2) Å, α = γ = 900, β = 112.41(1), V=1601.5(5) Å3 and Z = 4. Other parameters, such as atomic coordinates, bond lengths, bond angles, torsion angles and geometry of intermolecular interactions are also determined.</span