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Zheng-Yang Xu, Yuan-Ye Jiang, Hai-Zhu Yu, Yao Fu
The Ni-catalyzed C(sp(2))-H/C(sp(3))-H coupling of benzamides with toluene derivatives was recently successfully achieved with mild oxidant iC3F7I. Herein, we employ density functional theory (DFT) methods to resolve the mechanistic controversies. Two previously proposed mechanisms are excluded, and our proposed mechanism involving iodine-atom transfer (IAT) between iC3F7I and the Ni(II) intermediate was found to be more feasible. With this mechanism, the presence of a carbon radical is consistent with the experimental observation that (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) completely quenches the reaction...
November 2015: Chemistry, An Asian Journal
D Joshi, B Paranandi, G El Sayed, G Johnson, Mh Chapman, Sp Pereira, Gj Webster
INTRODUCTION: ERCP in the UK has historically been performed under conscious sedation (SED). However, given the increasing complexity of cases the role of enhanced sedation assisted ERCP (ENS ERCP) is increasing. A previous audit iat UCLH showed that intolerance of SED was a major factor in ERCP failure. BSG guidance was issued in 2011 regarding the use of propofol sedation for ERCP in the UK(.1) We describe our experience of ENS ERCP and highlight the importance of the regular availability of this service...
June 2014: Gut
Andrea Camperio Ciani, Umberto Battaglia
INTRODUCTION: An unambiguous measurement of the rate of nonheterosexuality in the male population (male bisexuality and homosexuality) is essential to estimate the health risks associated with same-sex sexual behavior and to scale social and health programs for these citizens. However, self-reported questionnaires on explicit measures of sexual orientation yield significant underestimations of nonheterosexuality. A necessary prerequisite for nonheterosexual preference is androphilia (sexual-erotic attraction to males), which can be explored through psychological tests...
September 2014: Journal of Sexual Medicine
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