Add time:08/23/2019         Source:sciencedirect.com

MP2/6-311+G(d,p) was employed to study the mechanism of the initial step of ring opening of temozolomide (TMZ-H) and its substituted, TMZ-R (R=Cl, OH, CF3) analogues. The study reveals that the difference formation energies of substituted MTIC acids with respect to MTIC acid are ranging between 0.44-1.58 kcal/mol. The ring opening of TMZ-R along pathway-2 leads to the lowest conformer (D), whereas reactions along pathway-1 give rise to lower transition states. The barrier energies of TMZ-R are 1.60-3.75 kcal/mol larger than TMZ-H. The conformational analysis reveals that intramolecular hydrogen bonds do not have a stabilizing effect in water solvent.

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