Zobrazeno 1 - 10 of 22 pro vyhledávání: '"Raimo Keskinen"'
1
Properties and reactions of 1,3-oxathiolans - V. Conformational energy of an axial 2-t-butyl group. An attempt to determine epimer equilibria by microcalorimetry
Autor: K. Pihlaja, Alpo Nikkilä, Raimo Keskinen
Publikováno v: Bulletin des Sociétés Chimiques Belges. 85:435-439
Chemical equilibration of epimeric 2-t-butyl-5-methyl-1, 3-oxathiolans led to -ΔHo=4.60±0.05 kJ mol−1 and -ΔSo=2.9±0.16 J mol−1K−1 for the trans cis equilibrium. From them and the values of 1H vicinal coupling constants the conformational e
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e64fbd51f3880a4097382758dbf60837
https://doi.org/10.1002/bscb.19760850609
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2
On the damping of temperature fluctuations in a circular tube relevant to the eddy covariance measurement technique
Autor: Timo Vesala, Raimo Keskinen, Üllar Rannik
Publikováno v: Journal of Geophysical Research: Atmospheres. 102:12789-12794
A semiempirical model for the heat exchanger design to find out a minimum length to dampen temperature fluctuations is presented. Stationary heat transport processes through the tube wall are analyzed by means of Nusselt numbers. The conservative tre
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ae77cd701e26202b7c8e590518da830d
https://doi.org/10.1029/97jd00362
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7
Nuclear magnetic resonance studies on the conformational, effects of alkyl-substituted 1,3-oxathiolanes 1–3
Autor: Alpo Nikkilä, Kalevi Pihlaja, Raimo Keskinen
Publikováno v: Journal of Molecular Structure. 19:357-363
The 1 H NMR spectra of a number of alkyl-substituted 1,3-oxathiolanes were recorded and analysed. The NMR data were employed to predict the configurations and most probable conformations of the 1,3-oxathiolane ring and also to estimate the conformati
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6c29dd9b98f65b5a345893d7ac86b5b2
https://doi.org/10.1016/0022-2860(73)85277-9
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8
Properties and reactions of 1,3-oxathiolans. Part 6. Chemical equilibration and1H nuclear magnetic resonance conformational study of 4,5-dimethyl-, 2,4,5-trimethyl-, and 2,2,4,5- and 2,4,4,5-tetramethyl-1,3-oxathiolans
Autor: Raimo Keskinen, Alpo Nikkilä, Kalevi Pihlaja
Publikováno v: J. Chem. Soc., Perkin Trans. 2. :343-347
The 60 MHz 1H n.m.r. spectra of nine differently substituted 4,5-dimethyl-1,3-oxathiolans have been recorded and analysed. The n.m.r. data are compared with those previously reported for the 4-methyl- and 5-methyl-1,3-oxa-thiolans. Epimeric derivativ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f84037bf07431775f3e8b930ae2e589
https://doi.org/10.1039/p29770000343
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10
Properties and reactions of 1,3-oxathiolans. Part IV. Conformational analysis of 2-alkyl-4-methyl- and 2-alkyl-2,4-dimethyl-1,3-oxathiolans with the aid of1H nuclear magnetic resonance spectroscopy and chemical equilibration
Autor: Raimo Keskinen, Kalevi Pihlaja, Frank G. Riddell, Alpo Nikkilä
Publikováno v: J. Chem. Soc., Perkin Trans. 2. :466-472
Several 2-alkyl-4-methyl- and 2-alkyl-2,4-dimethyl-1,3-oxathiolans have been prepared and their conformational properties clarified by examination of acid-catalysed equilibrations of diastereoisomers and with the aid of 100 and 220 MHz 1H n.m.r. spec
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4e37dcf348d112dc4687943481964c6a
https://doi.org/10.1039/p29740000466
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