A new solvent free method for protection of carbonyl compounds as their thioacetals has been accomplished through the use of iodine supported on nanostructured pyrophosphate. Advantages of the methodology include very...A new solvent free method for protection of carbonyl compounds as their thioacetals has been accomplished through the use of iodine supported on nanostructured pyrophosphate. Advantages of the methodology include very short reaction time, the requirement for minimum amounts of catalyst, the remarkably simple experimental procedure, and no necessity for solvents or inert atmospheres, excellent yields and recyclability of the catalyst used. An efficient method for the chemoselective thioacetalization of ketones in the presence of aldehydes using I2/nanostructured pyrophosphate is also reported in this article. The nanostructured pyrophosphate was characterized by scanning electron microscopy, X-ray diffraction, infrared spectroscopy, Transmission electron microscopy and thermal gravimetric analysis, respectively.展开更多
Hypervalent iodine(Ⅲ)reagents have been vastly used in many useful organic transformations.In this review article,we highlight the strategies that used the common hypervalent iodine(Ⅲ)reagents as oxidants to synthes...Hypervalent iodine(Ⅲ)reagents have been vastly used in many useful organic transformations.In this review article,we highlight the strategies that used the common hypervalent iodine(Ⅲ)reagents as oxidants to synthesize the heterocyclic compounds,based on the patterns of bond formation during the construction of the heterocyclic backbones.展开更多
AIM: To study the treatment effect of chronic pharyngitis using radiofrenquency and compound iodine glycerin. METHODS: If the patients were diagnosed as chronic simple pharyngitis and atrophic pharyngitis or pharyngit...AIM: To study the treatment effect of chronic pharyngitis using radiofrenquency and compound iodine glycerin. METHODS: If the patients were diagnosed as chronic simple pharyngitis and atrophic pharyngitis or pharyngitis sicca,they were treated with smearing compound iodine glycerin on the back wall of pharynx, combining with general treatment. If the patients were diagnosed as chronic hypertrophic pharyngitis, they were treated with radiofrenquency, combining with general treatment. The control groups were only treated with general treatment. RESULTS: Half a month post treatment, 268 cases were recovered (82.0%) among 327 patients; 56 cases were better (17.1%). In the control groups, 62 cases were healed (62.0%). The effect of the treatment using radiofrenquency or compound iodine glycerin is significantly better than that in the control groups (P<0.0001). CONCLUSION: Treatment of chronic simple pharyngitis and atrophic pharyngitis or pharyngitis sicca with smearing compound iodine glycerin on the back wall of pharynx, and the treatment of chronic hypertrophic pharyngitis using radiofrenquency are more effective than routine method. Their advantages are local treatment, accurate localization, simple process, short therapy duration, no bleeding and pain, higher cure rate.展开更多
文摘A new solvent free method for protection of carbonyl compounds as their thioacetals has been accomplished through the use of iodine supported on nanostructured pyrophosphate. Advantages of the methodology include very short reaction time, the requirement for minimum amounts of catalyst, the remarkably simple experimental procedure, and no necessity for solvents or inert atmospheres, excellent yields and recyclability of the catalyst used. An efficient method for the chemoselective thioacetalization of ketones in the presence of aldehydes using I2/nanostructured pyrophosphate is also reported in this article. The nanostructured pyrophosphate was characterized by scanning electron microscopy, X-ray diffraction, infrared spectroscopy, Transmission electron microscopy and thermal gravimetric analysis, respectively.
基金the National Natural Science Foundation of China(21072148)Foundation(B)for Peiyang Scholar-Young Core Faculty of Tianjin University(2013XR-0144)the Innovation Foundation of Tianjin University(2013XJ-0005)for financial support
文摘Hypervalent iodine(Ⅲ)reagents have been vastly used in many useful organic transformations.In this review article,we highlight the strategies that used the common hypervalent iodine(Ⅲ)reagents as oxidants to synthesize the heterocyclic compounds,based on the patterns of bond formation during the construction of the heterocyclic backbones.
文摘AIM: To study the treatment effect of chronic pharyngitis using radiofrenquency and compound iodine glycerin. METHODS: If the patients were diagnosed as chronic simple pharyngitis and atrophic pharyngitis or pharyngitis sicca,they were treated with smearing compound iodine glycerin on the back wall of pharynx, combining with general treatment. If the patients were diagnosed as chronic hypertrophic pharyngitis, they were treated with radiofrenquency, combining with general treatment. The control groups were only treated with general treatment. RESULTS: Half a month post treatment, 268 cases were recovered (82.0%) among 327 patients; 56 cases were better (17.1%). In the control groups, 62 cases were healed (62.0%). The effect of the treatment using radiofrenquency or compound iodine glycerin is significantly better than that in the control groups (P<0.0001). CONCLUSION: Treatment of chronic simple pharyngitis and atrophic pharyngitis or pharyngitis sicca with smearing compound iodine glycerin on the back wall of pharynx, and the treatment of chronic hypertrophic pharyngitis using radiofrenquency are more effective than routine method. Their advantages are local treatment, accurate localization, simple process, short therapy duration, no bleeding and pain, higher cure rate.
