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Kinetic Evidence for the Solvent Intervention in the Solvolysis of Tertiary Benzylic Benzoates

Chinese Journal of Chemistry 2006年第9期24卷 1238-1241页

作者：刘广定张立威秦建谱 Department of Chemistry National Taiwan UniversityTaibeiTaiwan 10617

rates of solvolyses of 2-（4-methylphenyl）-2-propyl benzoate （2b）, 2-（4-methylthiopheny1）-2-propyl benzoate （3b） and 2,2-dimethy1-1-（4-methoxypheny1）-1-phenyl-1-propy1 benzoate （4b） were measured, respectively, in ten or more different solvent systems. Additional YBnOPXB and Y, BnOPNB values in binary trifluoroethanol-water systems were determined, Grunwald-Winstein type correlation analysis showed that YBaIOBB values were applicable to benzylic benzoates. The rate ratio, koPNB/KOBZ, was found to be solvent-dependent in the range of 29 for 4 in ethanol to 4 for 2 in trifluoroethanol-water. Non-limiting mechanism, including both nucleophilic and electrophilic solvent assistance, in the solvolysis of 2b was discussed,

关键词： solvolysis correlation analysis rate ratio YBnOPNB scale tertiary benzylic benzoate

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Analysis of Cancer Incidence among Korean Nuclear Power Plant Workers

Analysis of Cancer Incidence among Korean Nuclear Power Plan...

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The Second Asian and Oceanic Congress for Radiation Protection

作者： Meeseon JEONG Young-Woo JIN Young Khi LIM Soo Keun KIM Byoung-Il LEE Youn Koun JANG Sook Hee SUNG Ill Keun PARK Yeon Joo LEE Chong-Soon KIM Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea Radiation Health Research Institute KHNPSeoulKorea

Epidemiological studies of nuclear industry workers have important role to examine the health effect of low dose and low dose-rate radiation *** this study we analyzed the cohort of Korean nuclear power plants *** cohort consists of 7,459 male workers exposed to ionizing radiation and 6,508 controls without exposure *** paper presents the results of analysis on their cancer incidence between 1993 and 2002.A total of 58 cancers were ascertained for radiation workers and 50 for non-radiation ***-standardized rate ratio for two groups was 1.09（95% CI:0.74,1.62）.Trend test showed that cancer incidence rate in individual dose group was not significantly increased with increasing cumulative dose（p=0.2506）.Excess relative risk for all cancers combined was 6.77（95% CI:-4.02,27.54）per sievert,suggesting no statistically significant association between radiation dose and cancer *** of this study are not conclusive because of considerable *** size of the cohort,small cases of cancer incidence,and young ages of subjects limit the power of the *** we need further follow-up and the expansion of cohort to increase the power and to obtain stable risk estimate.

关键词： radiation workers cohort standardized incidence ratio rate ratio excess relative risk

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