Nikodým-Type Theorems for Lattice Group-Valued Measures with Respect to Filter Convergence

We present some convergence and boundedness theorems with respect to filter convergence for lattice group-valued measures. We give a direct proof, based on the sliding hump argument. Furthermore we pose some open problems.

Variational principle and zero temperature limits of asymptotically （sub）-additive projection pressure

Let {Si}li=l be an iterated function system （IFS） on Rd with an attractor K. Let （S,cr） denote the one-sided full shift over the finite alphabet {1,2,...,l}, and let π：∑ -K be the coding map. Given an asymptotically （sub）-additive sequence of continuous functions{Si}n≥1, we define the asymptotically additive projection pressure Pπ and show the variational principle for Pπunder certain affine IFS. We also obtain variational principle for the asymptotically sub-additive projection pressure if the IFS satisfies asymptotically weak separation condition （AWSC）. Furthermore, when the IFS satisfies AWSC, we investigate the zero temperature limits of the asymptotically sub-additive projection pressure Pπ（β） with positive parameter β.

Catalytic Enantioselective 1,2-Addition of Terminal 1,3-Diynes to Trifluoromethyl Ketones

A facile catalytic enantioselective 1,2-addition of diynes to trifluoromethyl ketones was developed. By a com- bination of Me2Zn, Ti（OPr-i）4, BaF2 and quinine, the reaction of a series of terminal diynes with trifluoromethyl ke- tones proceeded to afford trifluoromethylated chrial tertiary alcohols with the diyne moiety in good to high yields with moderate to high enantioselectivities. Furthermore, this catalytic asymmetric diyne addition to trifluoro- methylketone was applied in the synthesis of the Efavirenz analogue.

Photoinduced reaction of potassium alkyltrifluoroborates,sulfur dioxide and para-quinone methides via radical 1,6-addition

A photoinduced reaction of potassium alkyltrifluoroborates,sulfur dioxide,and para-quinone methides under visible light irradiation at room temperature is developed,giving rise to diarylmethyl alkylsulfones in moderate to good yields.This reaction works well under photocatalysis with a broad substrate scope by using DABCO·(SO_(2))_(2)as the source of sulfur dioxide.Mechanistic study shows that this transformation is initiated by alkyl radicals generated in situ from potassium alkyltrifluoroborates in the presence of photocatalyst.The subsequent insertion of sulfur dioxide and radical 1,6-addition of para-quinone methides with alkylsulfonyl radical intermediates afford the corresponding diarylmethyl alkylsulfones.

External Photocatalyst-Free Visible Light-Promoted 1,3-Addition of Perfluoroalkyl Iodides to Vinyldiazoacetates

Alkenes and alkynes are typical substrates used in atom transfer radical addition(ATRA)reactions,resulting in the formation of vicinal disubstituted products.In this report,vinyldiazoacetates were first developed as the radical acceptors in an ATRA reaction of RfI,leading to 1,3-difunctional adducts.The reaction is driven by visible light,without the need for external photocatalysts and additives.A series of control experiments and density functional theory(DFT)calculations indicate the 1,3-addition proceeds via a radical-chain process and the initial Rf radical was generated by homolytic dissociation of a radical pair complex of triplet free vinylcarbene and perfluoroalkyl iodide.After postreaction isomerization,various 1-iodo-3-perfluoroalkyl-alkenes were obtained in good yields with high Z selectivity.The synthetic utility of the ATRA 1,3-adduct was demonstrated by cross-coupling reactions and defluorination of perfluoroalkyl groups.

N-Heterocyclic Carbene-Catalyzed 1,6-Addition of Homoenolate Equivalent Intermediates: Asymmetric Synthesis of Nonspirocyclic Quaternary Oxindoles

Although there is a growing interest in developing asymmetric 1,6-addition reactions of carbon nucleo-philes to Michael acceptors,the corresponding 1,6-addition of homoenolates remains an unsolved problem.Currently,the N-heterocyclic carbene(NHC)-catalyzed cycloadditions of homoenolate equivalent intermediates have achieved widespread success.However,considerable limitations still exist for the linear reactions with electron-deficient alkenes,which are limited to 1,4-Michael acceptors.This report presents the first NHC-catalyzed asym-metric homoenolate addition of enals to 1,6-Michael acceptors.The strategy leads to the challenging nonspirocyclic 3,3-disubstituted oxindoles with two adjacent stereocenters,a quaternary and a trisubsti-tuted one,in good yields and high stereoselectivities with a wide variety of substrates.

Chiral Sulfinamide-Olefin Ligands： Switchable Selectivity in Rhodium-Catalyzed Asymmetric 1,2-Addition of Arylboronic Acids to Aliphatic α-Ketoesters

Simple and readily available chiral N-（sulfinyl）allylamines have been developed as efficient novel ligands for the rhodium-catalyzed enantioselective 1,2-addition of arylboronic acids to challenging aliphatic a-ketoesters. By employing the linear or branched sulfinamide-olefin ligands, interesting enantioselectivity as well as regioselectiw ity reversal in the related asymmetric additions were observed.

Facile Preparation of Homoallyl β′,γ′-Unsaturated Amines via 1,2-Addition of α,β-Unsaturated Imines with Allylsamarium Bromide

A series of homoallyl β', γ'-unsaturated amines were synthesized via1,2-addition of α,β-unsaturated imines with allylsamarium bromide in excellent yields under mildand neutral conditions.

复杂关联情境下城市典型生命线运行风险评估研究

针对城市典型生命线运行风险评估的多主体性、多诱因性以及复杂关联性,本文首先构建了具有层级网络结构的运行风险评估框架以及由风险可能性和风险后果两个维度构成的矩阵分析模型,然后提出了一种考虑复杂关联情境的运行风险评估方法,借助二元语义表示模型对2-additive Choquet积分算子进行扩展,以便实现权重信息、关联信息以及风险可能性评估信息和风险后果评估信息的处理与集结,进而获得各主体及综合运行风险评估结果。最后,应用所提方法评估了北京某样区城市典型生命线运行风险,并根据评估结果制定了针对性的风险防范措施。

复杂语言关联情境下科技期刊品牌竞争力评价研究

【目的】提高科技期刊品牌竞争力评价的科学性和精确性。【方法】在考虑评价体系的多维度性、多要素性以及复杂关联性的基础上,构建了具有层次子网络结构的科技期刊品牌竞争力评价框架,并给出一种考虑复杂关联情境的评价方法。【结果】该方法借助二元语义信息表示模型,运用决策实验与评价实验室(DEMATEL)法确定评价框架中各维度及其构成要素的重要性程度,采用2-additive Choquet积分算子进行信息处理与集结,从而获得各维度及其综合评价值,并进一步计算出各维度对综合评价值的贡献。【结论】实例分析表明,该方法具有较好的应用价值,能为科技期刊管理者了解现状、有效管理和提升品牌竞争力提供决策支持。

Facile synthesis of α-difluoromethyl α-propargylamines from CF_2H-substituted N-tert-butanesulfinyl ketimines

Stereoselective approach for preparation ofα-difluoromethylα-propargylamines has been developed.1,2-Addition of lithium acetylides to diverse chiral difluoromethylated（S）-N-tert-butanesulfinyl ketimines by using Ti（O^iPr）_4 as catalyst and THF as solvent afforded N-tert-butanesulfinamides in good to excellent yields（51-93%） and good diastereoselectivities（dr.85：15 to 93：7）.The N-tert -butanesulfinyl group can be readily cleaved under mild acidic condition（4 mol/L HCl in dioxane） to provide the correspondingα-difiuoromethylα-propargylamine in excellent yields（90-95%）.

Rhodium catalyzed asymmetric synthesis of Chiraphos derivatives

Herein,we report a highly efficient versatile synthetic route to Chiraphos derivatives through Rh/Ph-bod catalyzed asymmetric addition of aryl boronic acids to phosphinyl dienes.Various substituted phosphinyl dienes,both on the parent skeleton and the phosphine atoms,were well tolerated with this method and provided chiral phosphine oxides in satisfied yield and up to 95%ee.The corresponding Chiraphos derivative displayed an advantage over Chiraphos in the representative Pd-catalyzed asymmetric 1,4-addition reaction.

Photochemical addition of methanol to V60:Formation of 1,4-dimethoxyfullerene

The addition of methanol to C60 in the presence of acetylglycine (AG) was carried out under irradiation.The novel compound,1,4-dimethoxyl-l,4-dihydrofullerene (1),was isolated and characterized by FTIR,UV-vis,1H and 13C NMR,and FDMS.