2,6-Diisopropylphenylphosphane: A new, bulky primary phosphane and its mono- and disilylated Si(CH3)3 and Si(CH3)2-t-Bu derivatives A synthetic, crystallographic, and dynamic NMR investigation
Influence of Chain Length on the Structures and Dynamic Behavior of Alkyl-Tethered α,ω-Diphosphide Complexes of Lithium and Their Use in the Synthesis of <i>P</i>-Heterocyclic Stannylenes
作者:Keith Izod、Peter Evans、Thomas Horsley Downie、William McFarlane、Paul G. Waddell
DOI:10.1021/acs.inorgchem.8b02510
日期:2018.12.3
(6Li), and [CH2CH2CH2P(Dipp)}2]2Li4(THF)6·PhMe (7Li) after crystallization. Compounds 4Li–7Li adopt either monomeric or dimeric structures in the solid state, depending on the length of the alkyl tether of the diphosphide ligand. In solution, compounds 4Li–7Li exhibit dynamic behavior: variable-temperature 31P1H} and 7LiNMR spectroscopic studies indicate that this involves equilibria between monomeric
烷基连接的α,ω-二膦(Dipp)PH(CH 2)n PH(Dipp)(n = 1(3H),2(4H),3(5H),4(6H)和5(7H) )以高收率制备,并通过多核NMR光谱表征[Dipp = 2,6- i Pr 2 C 6 H 3 ]。用2当量的n BuLi和2当量的TMEDA处理3H,得到二磷化合物[CH 2 P(Dipp)} 2 ] Li 2(TMEDA)2(3Lia),结晶为不显示温度相关NMR行为的离散单体。的治疗4H - 7H与2当量的Ñ BuLi的THF给出diphosphides [[CH 2 P(迪普)}] 2 ] 2李4(THF)2(OET 2)2(4Li),[CH 2 CH 2 P(Dipp)} 2 ] Li 2(THF)4(5Li),[CH 2 CH 2 P(Dipp)} 2 ] Li 2(THF)6(6Li)和[CH 2 CH 2 CH 2 P(Dipp)}
Are Monophospha(III)amidines and ‐guanidines with Ionizable Hydrogens Tautomeric? Towards a Deeper Understanding of Two Related Hetero‐element Functional Groups
作者:Jason D. Masuda、Leila Mokhtabad Amrei、René T. Boeré
DOI:10.1002/ejic.202300495
日期:2023.11.24
Which is preferred, C-amino-(σ2,λ3)-phosphaalkene P=C or C-(σ3,λ3)-phosphinoimine N=C? The answer seems to depend on the backbone substituent R. When R is an aryl group (or hydrogen) P=C is consistently preferred over N=C, though both isomers exist in solution. When R is a tBu or amino group, N=C is preferred, with no evidence for the other isomers in solution.
Procatalysts, catalyst systems, and use in olefin polymerization
申请人:——
公开号:US20010025005A1
公开(公告)日:2001-09-27
There are described solid procatalysts, catalyst systems incorporating the solid procatalysts, and the use of the catalyst systems in olefin polymerization and interpolymerization.
本文介绍了固体原催化剂、含有固体原催化剂的催化剂体系以及催化剂体系在烯烃聚合和互聚中的应用。
Procatalysts, catalyst systems, and use in OLEFIN polymerization
申请人:——
公开号:US20010029286A1
公开(公告)日:2001-10-11
There are described solid procatalysts, catalyst systems incorporating the solid procatalysts, and the use of the catalyst systems in olefin polymerization and interpolymerization.