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Two new gold‐catalyzed tandem cycloisomerization–halogenation reactions of chiral homopropargyl sulfonamides have been developed. Various enantioenriched 3,3‐diiodopyrrolidin‐2‐ols and 3‐fluoropyrrolidin‐2‐ols were obtained in moderate‐to‐good yields with excellent enantio‐ and diastereoselectivity.
Tandem Reactions Two novel gold‐catalyzed tandem cycloisomerization–halogenation reactions of chiral homopropargyl sulfonamides have been developed. Various enantioenriched 3,3‐diiodopyrrolidin‐2‐ols and 3‐fluoropyrrolidin‐2‐ols were obtained in moderate to good yields with excellent stereocontrol of enantioselectivity and diastereoselectivity by using N‐iodosuccinimide and Selectfluor as halogen...
To date, there is only limited research that explicitly exploits the relationships among Action Units and expressions for facial expression recognition. In this paper, we propose an facial expression recognition method through modeling the expression-dependent AU relations. First, the incremental association Markov blanket algorithm is adopted to select crucial action units for a certain expression...
Sentiment-objects Extraction aims to identify the targets of opinion described in sentiment sentence. Previous research fails to deal with the long-distance dependencies in Chinese sentences such as opinion targets repeated and echo of the different part of sentence. In this paper, we describe a probabilistic approach that incorporates the long-distance dependencies to identify opinion targets. The...
Vertical Organic Thin-Film Transistors (VOTFT) that consisted of copper phthalocyanine(CuPc) which sandwich structure of Au(Source)/CuPc/Al(Gate)/CuPc/Au(Darin) have been fabricated using vacuum evaporated technology. When the conditions of bias voltage was VDS=2V, IDS/IGS=1000 and current density JDS=1.1mA/mm2
A method of integrating multi-source geology spatial data sets and logistic regression modelling for mineral prospectivity mapping is described in this paper. Logistic regression model describes the relationship between a dependent variable, which is a binary variable representing the presence or absence of the mineral deposits, and k independent variables represent ore-controlled geological features...
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