The stereoisomers of 1,3-dithiane 1,3-dioxides. Preparation, configuration and some conformational aspects
作者:Shlomo Bien、Sol K. Celebi、Moshe Kapon
DOI:10.1039/p29900001987
日期:——
Oxidation of 1,3-dithiane with different oxidizing agents gave the 1,3-dithiane cis- and trans-1,3-dioxides 1 and 2. Their configuration and the conformational preferences of the sulphinyl oxygen atom have been determined by NMR spectroscopy and by X-ray analyses.
Abstract Compounds with composition [Ln( cis -DTSO 2 ) 4 (H 2 O) 2 ](pic) 3 (pic=picrate, Ln=Pr–Lu and Y) were obtained by reaction of hydratedlanthanidepicrate with cis -DTSO 2 in absolute ethanol. The adducts were characterized by elemental analyses and IR spectra. The parameters obtained from the absorption spectrum of the solid Nd compound indicate that the metal–ligand bonds present weak covalent
摘要 通过水合苦味酸镧系元素与顺式-DTSO 2 反应,得到了组成为[Ln( cis -DTSO 2 ) 4 (H 2 O) 2 ](pic) 3 (pic=苦味酸,Ln=Pr-Lu和Y)的化合物。在无水乙醇中。加合物通过元素分析和红外光谱表征。从固体 Nd 化合物的吸收光谱获得的参数表明金属-配体键呈现弱共价特性。Eu 化合物在 77 K 下获得的低强度发射光谱表明存在二聚体。X 射线粉末图案仅显示一个同晶系列。钬化合物的X射线单晶数据表明其晶系为三斜晶系,空间群P 1 ,a =13.387(1) A, b =14.243(1) A, c =14.965(1) A, α = 99.879(8)°,β =102.063(9)°,γ =101.620(1)。Ho离子通过一个双齿顺式-DTSO 2 的两个氧、四个单齿顺式-DTSO 2 的四个氧(其中一个作为两个相邻的Ho离子之间的桥梁)和两个
Highly stereoselective addition reactions of metallated trans-1,3-dithiane-1,3-dioxide to aldehydes
作者:Varinder K. Aggarwal、Richard J. Franklin、Martin J. Rice
DOI:10.1016/0040-4039(91)80580-y
日期:1991.12
The sodium anion of trans-1,3-dithiane-1,3-dioxide reacts with unhindered aromatic and heteroaromatic aldehydes to give adducts with 95:5 to 97:3 diastereoselectivity.
Aggarwal, Varinder K.; Davies, Ian W.; Franklin, Richard J., Journal of the Chemical Society. Perkin transactions I, 1991, # 3, p. 662 - 664
作者:Aggarwal, Varinder K.、Davies, Ian W.、Franklin, Richard J.、Maddock, John、Mahon, Mary F.、Molloy, Kieran C.