Norbornene derivatives exo,endo-2-[2-(3,5-di-tert-butyl-4-hydroxyphenoxy)-acetoxy]methyl-5-norbornene(M1) and 3,3,5,5-tetramethyl-4-piperidinyl 5-norbornene-exo,endo-2-carboxylate(M2)were synthesized and polymerized b...Norbornene derivatives exo,endo-2-[2-(3,5-di-tert-butyl-4-hydroxyphenoxy)-acetoxy]methyl-5-norbornene(M1) and 3,3,5,5-tetramethyl-4-piperidinyl 5-norbornene-exo,endo-2-carboxylate(M2)were synthesized and polymerized by RuCl_2(=CHPh)(PCy_3)_2 to prepare a novel kind of bi-functional polymer bearing sterically hindered phenol(SHP)and hindered amine(HLAS)groups via ring-opening metathesis polymerization(ROMP).The resulting copolymers were characterized by gel permeation chromatography(GPC),~1H-NMR and differen...展开更多
Bulky azole ligands in combination with PdCl2 provide three new palladium(II)complexes.All these complexes,as pre-catalysts,have high catalytic efficiency for the Suzuki-Miyaura cross-coupling reactions of sterically ...Bulky azole ligands in combination with PdCl2 provide three new palladium(II)complexes.All these complexes,as pre-catalysts,have high catalytic efficiency for the Suzuki-Miyaura cross-coupling reactions of sterically hindered aryl chlorides and good to high yields are obtained with low catalysts loadings(0.1 mol%)under mild conditions in air.展开更多
Although the classical Ritter reaction has beenwidely applied to prepare sterically hindered amides since 1948,it has intrinsic problems,such as harsh reaction conditions,the multistep preparation of synthetic precurs...Although the classical Ritter reaction has beenwidely applied to prepare sterically hindered amides since 1948,it has intrinsic problems,such as harsh reaction conditions,the multistep preparation of synthetic precursors,and the use of solvent quantities of nitrile.In particular,only a few examples of the total synthesis of natural products using the Ritter reaction as a key step have been reported to date.展开更多
Based on three rationally designed pyrrole-appended o-carborane derivatives,we present that fluores-cence properties of crystalline materials are highly dependent on intermolecular interaction and steric hinderance.Th...Based on three rationally designed pyrrole-appended o-carborane derivatives,we present that fluores-cence properties of crystalline materials are highly dependent on intermolecular interaction and steric hinderance.Though the three molecules are similar in structure,single crystals of the three compounds showed obvious difference in molecular stacking and fluorescence behavior.Systematic studies indicate that fluorescence quantum yields,thermo-response as well as mechano-response are highly dependent on intermolecular interaction and steric hindrance.In the three crystalline materials,the CB-NMe crys-tals with weaker intermolecular interaction and looser molecular packing showed superior fluorescence quantum yield and temperature sensitivity.Accordingly,surface temperature detection strip with favor-able reversibility is prepared by doping CB-NMe into the polymer.In addition,the CB-NMe aggregates can be used for monitoring bovine serum albumin(BSA)denaturation,as temperature response of the aggregates can be reversed when co-assembled with BSA.展开更多
基金Sasakawa Scientific Research Grant from the Japan Science Society.
文摘Norbornene derivatives exo,endo-2-[2-(3,5-di-tert-butyl-4-hydroxyphenoxy)-acetoxy]methyl-5-norbornene(M1) and 3,3,5,5-tetramethyl-4-piperidinyl 5-norbornene-exo,endo-2-carboxylate(M2)were synthesized and polymerized by RuCl_2(=CHPh)(PCy_3)_2 to prepare a novel kind of bi-functional polymer bearing sterically hindered phenol(SHP)and hindered amine(HLAS)groups via ring-opening metathesis polymerization(ROMP).The resulting copolymers were characterized by gel permeation chromatography(GPC),~1H-NMR and differen...
基金Supported by the Natural Science Foundation of Tianjin(No.16JCYBJC19700)the National Natural Science Foundation of China(No.21771138)。
文摘Bulky azole ligands in combination with PdCl2 provide three new palladium(II)complexes.All these complexes,as pre-catalysts,have high catalytic efficiency for the Suzuki-Miyaura cross-coupling reactions of sterically hindered aryl chlorides and good to high yields are obtained with low catalysts loadings(0.1 mol%)under mild conditions in air.
基金the NSFC(grant nos.21971095,21772076,and 91956203.)for financially supporting this work.
文摘Although the classical Ritter reaction has beenwidely applied to prepare sterically hindered amides since 1948,it has intrinsic problems,such as harsh reaction conditions,the multistep preparation of synthetic precursors,and the use of solvent quantities of nitrile.In particular,only a few examples of the total synthesis of natural products using the Ritter reaction as a key step have been reported to date.
基金funding from the Natural Science Foundation of China (Nos. 22072084, 21820102005)111 Project (No. B14041)+1 种基金the Fundamental Research Funds for the Central Universities (Nos. GK202103048, GK202001005, 2020CSLY008)the Innovation Capability Support Program of Shaanxi (No. 2021TD-18)
文摘Based on three rationally designed pyrrole-appended o-carborane derivatives,we present that fluores-cence properties of crystalline materials are highly dependent on intermolecular interaction and steric hinderance.Though the three molecules are similar in structure,single crystals of the three compounds showed obvious difference in molecular stacking and fluorescence behavior.Systematic studies indicate that fluorescence quantum yields,thermo-response as well as mechano-response are highly dependent on intermolecular interaction and steric hindrance.In the three crystalline materials,the CB-NMe crys-tals with weaker intermolecular interaction and looser molecular packing showed superior fluorescence quantum yield and temperature sensitivity.Accordingly,surface temperature detection strip with favor-able reversibility is prepared by doping CB-NMe into the polymer.In addition,the CB-NMe aggregates can be used for monitoring bovine serum albumin(BSA)denaturation,as temperature response of the aggregates can be reversed when co-assembled with BSA.
