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The Claisen Rearrangement is a 3,3-sigmatropic rearrangement

The Claisen Rearrangement is a 3,3-sigmatropic rearrangement

DMPU is an HMPT substitute. (HMPA has undesirable carcinogenicity) The addition of HMPT or DMPU significantly increases solvent polarity, sometimes improving the yields of certain reactions, such as substitutions. The Claisen Rearrangement is a 3,3-sigmatropic rearrangement.

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Yunhui Zheng 2012.10.12

Yunhui Zheng 2012.10.12

Stereocontrolled total synthesis of bengazole A: a marine bisoxazole natural product displaying potent antifungal properties. Yunhui Zheng 2012.10.12.

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Solvent Effects

Solvent Effects

nonequilibrium excited state. Solvent Effects. Increased viscosity can increase luminescence intensity. H-bonding and dipole interactions with the solvent contribute to the Stokes shift. Ashutosh Sharma and Stephen Schulman, Fluorescence Spectroscopy , John Wiley & Sons, New York, 1999.

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Structural Study on Propylamide by FT-IR Spectrometry Using Chemometrics Applications

Structural Study on Propylamide by FT-IR Spectrometry Using Chemometrics Applications

Solvent effects and sample concentration effects on the structural changes of propylamide have been investigated by FT-IR measurement using principal component analysis. The absorption peaks observed at higher frequency and higher intensity when using chloroform and dichloromethane compared to benzene. The concentration study reveals that propylamide form a high degree of association in benzene. Shifting the composition of the solvent from benzene to chloroform or dichloromethane, the intensity that comes from the association of molecule decreases since association is more favored in non-polar solvents. In spectra of propylamide in mixtures of benzene and dichloromethane an increment in the intensity of bands as well as a solvatochromic effect (blue shift) is observed upon increasing the polarity of the medium (solvatochromic effect).

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