The stability constants of PdAB ternary complexes were determined by potentionmetric pH titration at 25℃,I=0.1mol/l KNO3,whereA=2,2′-bipyridy1-3,3′-dicarboxylicacid,B=Alanine,3,5-Dibr-tyrosine and 3,5-DiI-tyrosine....The stability constants of PdAB ternary complexes were determined by potentionmetric pH titration at 25℃,I=0.1mol/l KNO3,whereA=2,2′-bipyridy1-3,3′-dicarboxylicacid,B=Alanine,3,5-Dibr-tyrosine and 3,5-DiI-tyrosine.The binary complexes stability constants have also been determined at the same conditions.And compared with alanine,tyrosine system,the possible reasons that lead to extra stability of ternary complexes were discussed from the viewpoint of aromatic ring stacking,d-pπbond or hydrogen-bond.展开更多
In this paper, we present Continuous Multiple Center(CMC) d-p πbond in TS_2 slabs on the basis of Extended Huckle calculation for incommensurate misfit compounds (MS)_xTS_2(where M=Pb, Sn and La; T=V,Nb,Ta, Cr), and ...In this paper, we present Continuous Multiple Center(CMC) d-p πbond in TS_2 slabs on the basis of Extended Huckle calculation for incommensurate misfit compounds (MS)_xTS_2(where M=Pb, Sn and La; T=V,Nb,Ta, Cr), and put forwards the trigonal prismatic coordination CMC d-p π conductive model. According to this model the conductivity of (MS)_xTS_2 series and the similarity between (MS)_xTS_2 and Na_xTS_2 series compounds in metallic behaviors can be explained successfully. Some relations between metallic behaviors and CMC d-p π bond (or band) are found.展开更多
A mild,green,convenient and scalable N-bromosuccinimide(NBS)promoted direct phosphorylation strategy of secondary phosphine oxides and alcohols for the synthesis of various phosphinate esters was developed.A variety o...A mild,green,convenient and scalable N-bromosuccinimide(NBS)promoted direct phosphorylation strategy of secondary phosphine oxides and alcohols for the synthesis of various phosphinate esters was developed.A variety of substrates are well-tolerated and the desirable compounds were afforded in moderate to excellent yields(up to 92%).This reaction is conducted at room temperature without the addition of any oxidant and metal catalyst,which provides a new strategy for the synthesis of phosphinate esters.展开更多
有机磷化合物因其在药物化学、材料化学和有机化学领域的广泛应用,以及作为配体和有机催化剂在有机合成中的显著地位而受到越来越多的关注。通过钯催化构建C-P键的反应,可以将简单底物转化为结构复杂的有机磷化合物,实现具有重要化学价...有机磷化合物因其在药物化学、材料化学和有机化学领域的广泛应用,以及作为配体和有机催化剂在有机合成中的显著地位而受到越来越多的关注。通过钯催化构建C-P键的反应,可以将简单底物转化为结构复杂的有机磷化合物,实现具有重要化学价值的化学转化。根据构建的C-P键类型不同,本文对近年来基于过渡金属钯催化的反应策略合成有机磷化合物的反应及关键反应机理进行了综述和探讨,并展望该研究领域的未来发展前景。Organic phosphorus compounds have received increasing attention due to their widespread applications in pharmaceutical chemistry, material chemistry, and organic chemistry, as well as their outstanding position as ligands and organic catalysts in organic synthesis. The palladium catalyzed C-P bond construction reaction can convert simple substrates into structurally complex organic phosphorus compounds, achieving chemical transformations with significant chemical value. According to the different types of reactions, the synthesis of organophosphorus compounds base on palladium-catalyzed reaction strategies in recent years and the key reaction mechanisms were reviewed and discussed, and the future development prospect of this research field was prospected.展开更多
文摘The stability constants of PdAB ternary complexes were determined by potentionmetric pH titration at 25℃,I=0.1mol/l KNO3,whereA=2,2′-bipyridy1-3,3′-dicarboxylicacid,B=Alanine,3,5-Dibr-tyrosine and 3,5-DiI-tyrosine.The binary complexes stability constants have also been determined at the same conditions.And compared with alanine,tyrosine system,the possible reasons that lead to extra stability of ternary complexes were discussed from the viewpoint of aromatic ring stacking,d-pπbond or hydrogen-bond.
文摘In this paper, we present Continuous Multiple Center(CMC) d-p πbond in TS_2 slabs on the basis of Extended Huckle calculation for incommensurate misfit compounds (MS)_xTS_2(where M=Pb, Sn and La; T=V,Nb,Ta, Cr), and put forwards the trigonal prismatic coordination CMC d-p π conductive model. According to this model the conductivity of (MS)_xTS_2 series and the similarity between (MS)_xTS_2 and Na_xTS_2 series compounds in metallic behaviors can be explained successfully. Some relations between metallic behaviors and CMC d-p π bond (or band) are found.
文摘A mild,green,convenient and scalable N-bromosuccinimide(NBS)promoted direct phosphorylation strategy of secondary phosphine oxides and alcohols for the synthesis of various phosphinate esters was developed.A variety of substrates are well-tolerated and the desirable compounds were afforded in moderate to excellent yields(up to 92%).This reaction is conducted at room temperature without the addition of any oxidant and metal catalyst,which provides a new strategy for the synthesis of phosphinate esters.
文摘有机磷化合物因其在药物化学、材料化学和有机化学领域的广泛应用,以及作为配体和有机催化剂在有机合成中的显著地位而受到越来越多的关注。通过钯催化构建C-P键的反应,可以将简单底物转化为结构复杂的有机磷化合物,实现具有重要化学价值的化学转化。根据构建的C-P键类型不同,本文对近年来基于过渡金属钯催化的反应策略合成有机磷化合物的反应及关键反应机理进行了综述和探讨,并展望该研究领域的未来发展前景。Organic phosphorus compounds have received increasing attention due to their widespread applications in pharmaceutical chemistry, material chemistry, and organic chemistry, as well as their outstanding position as ligands and organic catalysts in organic synthesis. The palladium catalyzed C-P bond construction reaction can convert simple substrates into structurally complex organic phosphorus compounds, achieving chemical transformations with significant chemical value. According to the different types of reactions, the synthesis of organophosphorus compounds base on palladium-catalyzed reaction strategies in recent years and the key reaction mechanisms were reviewed and discussed, and the future development prospect of this research field was prospected.
