naa a22 4500 510774563 CHVBK 20180411083226.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s12210-013-0243-3 doi (NATIONALLICENCE)springer-10.1007/s12210-013-0243-3 Keheyan Yeghis ISMN-CNR, c/o Department of Chemistry, University "La Sapienza”, P.le A. Moro 5, 00185, Rome, Italy aut Pyrolytic behavior of simple chiral molecules: secondary aromatic alcohols [Elektronische Daten] [Yeghis Keheyan] The present study relates to the problem of the thermal stability of simple chiral molecules. Rough estimates of the temperatures under which the chirality phenomenon could survive have been reported. The chiral molecules tested in the present study were 1-phenylethanol (PE) enantiomers [(S(−)- and R-(+)-], S-(−)-1-phenylpropanol [PPe] and S-(+)-trifluoro-1-phenylethanol. The pyrolysis of the above-mentioned chiral alcohols with and without catalysts at different temperatures (200-600°C) has been carried out. In the presence of catalysts the partial racemization (≤20%) and formation of products like styrene, acetophenone, benzaldehyde and chiral benzylic ethers have been detected in the case of PE. Without catalysts almost no racemization was observed and product formation was not appreciable. The kinetics of racemization has been calculated and a tentative mechanism has been proposed. A principal components analysis model was created using the results obtained with all catalysts at different temperatures and with the main products, i.e., acetophenone, dibenzylic ethers and styrene to discriminate the catalysts on the basis of their effects. Accademia Nazionale dei Lincei, 2013 Chiral 1-phenylethanol enantiomers nationallicence Pyrolysis-GC/MS nationallicence Racemization nationallicence Enantiomeric excess nationallicence Catalysts nationallicence Rendiconti Lincei Springer Milan 24/3(2013-09-01), 239-249 2037-4631 24:3<239 2013 24 12210 https://doi.org/10.1007/s12210-013-0243-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12210-013-0243-3 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Keheyan Yeghis ISMN-CNR, c/o Department of Chemistry, University "La Sapienza”, P.le A. Moro 5, 00185, Rome, Italy aut NATIONALLICENCE 773 0- Rendiconti Lincei Springer Milan 24/3(2013-09-01), 239-249 2037-4631 24:3<239 2013 24 12210 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer