Heterotricyclodecane. XXVI. 2,6-Dioxatricyclo [3.3.2.03,7]decan,ein neuartiges isomers von 2,6-dioxaadamantan

2,6-Dioxatricyclo [3.3.2.0^3,7]decane, a Novel Isomer of 2,6-Dioxaadamantane Restriction among the great number of possible diheterotricyclodecanes to such with a carbocyclic 8membered ring (cyclooctane) as basic skeleton, which is crosswise bridged by two heteroatoms, and restriction to 5-, 6- and 7membered heterocyclic rings results in the isomeric diheterotricyclodecanes of the following five different structural types: 2,6-diheteroadamantane (a) , 2,7-diheteroisotwistane (b) , 2,7-diheterotwistance (c) , 2,8-diheterohomotwistbrendane (d) , and 2,6-diheterotricyclo [3.3.2.0^3,7]decane (e ; s. Scheme 1). Starting from a suitably C (5)^o(2)-functionalized 2,7-dioxaisotwistane, first representatives with the hitherto unknown skeleton of type e were prepared by molecular rearrangement involving neighboring group participation: 2,6-dioxatricyclo [3.3.2.0^3,7]decane (41) and the derivatives 34–40 thereof (Scheme 7).     

Synthese und Struktur von [ImNCS2K] (ImN = 1,3-Dimethylimidazolin-2-imino): ein neuartiges Kaliumdithiocarbiminat

Synthesis and Structure of [ImNCS₂K] (ImN = 1,3-Dimethylimidazoline-2-imino): a Novel Potassium Dithiocarbiminate The reaction of the 2-iminoimidazoline 4 with KMe gives the potassium imidate 7 from which the potassium 1,1-dithiolate 8 is obtained in almost quantitative yield. Crystals of C₆H₈N₃S₂K · 1/6 CH₃CN ( 8 · 1/6 CH₃CN) are triclinic, space group P1 , Z = 6, a = 10.988(4), b = 13.597(8), c = 13.622(9) Å, α = 113.003, β = 105.53(3), γ = 105.62(3)°, V = 1636.90 ų. The structure consists of a complicated 3-dimensional framework in which the K₂ units bridged by the four sulfur atoms of two thiolate ligands are connected by nitrogen and sulfur bridges.