CHLORINE in the nature has two stable isotopes, <sup>35</sup>Cl and <sup>37</sup>Cl. Two methods of determining isotopic ratios of chlorine were once developed. Owen, Kaufmann and Long determin...CHLORINE in the nature has two stable isotopes, <sup>35</sup>Cl and <sup>37</sup>Cl. Two methods of determining isotopic ratios of chlorine were once developed. Owen, Kaufmann and Long determined <sup>37</sup>Cl/<sup>35</sup>Cl ratios based on the measurement of CH<sub>3</sub>Cl<sup>+</sup> ion produced by ionization of methyl chlorine. The precision of the measurement of Cl-（NTIMS） was reported by Shields and Vengosh. The NTIMS has less precision.展开更多
The compound trifluoroiodomethane can be activated to react with the electron donor, 1,4-dilithiotetraphenyl butadiene, by means of electron transfer catalysis (ETC). The structure of the product, 1,3-difluorotetraphe...The compound trifluoroiodomethane can be activated to react with the electron donor, 1,4-dilithiotetraphenyl butadiene, by means of electron transfer catalysis (ETC). The structure of the product, 1,3-difluorotetraphenyl, benzene (1), was determined by MS, NMR, and X-ray single crystal diffraction. The conformations of compound 1 and its derivatives were analysized by molecular mechanics.展开更多
文摘CHLORINE in the nature has two stable isotopes, <sup>35</sup>Cl and <sup>37</sup>Cl. Two methods of determining isotopic ratios of chlorine were once developed. Owen, Kaufmann and Long determined <sup>37</sup>Cl/<sup>35</sup>Cl ratios based on the measurement of CH<sub>3</sub>Cl<sup>+</sup> ion produced by ionization of methyl chlorine. The precision of the measurement of Cl-（NTIMS） was reported by Shields and Vengosh. The NTIMS has less precision.
基金Project supported by the National Natural Science Foundation of China.
文摘The compound trifluoroiodomethane can be activated to react with the electron donor, 1,4-dilithiotetraphenyl butadiene, by means of electron transfer catalysis (ETC). The structure of the product, 1,3-difluorotetraphenyl, benzene (1), was determined by MS, NMR, and X-ray single crystal diffraction. The conformations of compound 1 and its derivatives were analysized by molecular mechanics.
