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Petroleum ether as a thermal bonding agent in low temperature experiments

โœ Scribed by H. Suzuki; M. Koyama


Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
198 KB
Volume
15
Category
Article
ISSN
0011-2275

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Conformational analysis of crown ether a
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Two conformations of the cis-cyclohexano-8-crown-3 molecule were detected at 185 K. From relative 13 C NMR peak area measurements, the conformation with the O-CH 2 -O unit equatorial was found to be favoured by 4.4 ลก 0.4 kJ mol 1 . In the spectrum of the minor conformer at low temperature, a 9.6 ppm