Ring Compounds and Polymers from Polymethylene Dihalides and Dimercaptans¹

Abstract

Ring Compounds from Polymethylene Dihalides and Dimercaptans 2177 ture of benzyl alcohol and benzaldehyde; 0.73 g. of resinous material was left.Attempt to Separate 10-Benzylanthrone (XVII) from Reaction Mixture Above.-From the second half of the ethereal solution of the Grignard product, no crystalline material could be separated except anthraquinone, which was obtained in a yield of 10 g.Catalytic Reduction of Benzalanthrone 10-Benzylanthrone (XVII).-Twenty grams of benzalanthrone in 225 cc. of absolute alcohol was reduced with hydrogen and a palladium catalyst, absorption being rapid.Allowed to stand in the reaction vessel for thirty-six hours, the fluorescence disappeared. The alcohol was removed under diminished pressure, the residue taken up in ether, warmed on water-bath, and let stand for some hours; 2.0 g. of anthraquinone separated, and on adding petroleum ether to the filtered solution, 9 g. of pure 10-benzylanthrone separated in large colorless prisms; recrystallized from ether-petroleum ether, m, p. 91-92°.

Novel Bifunctional [16]aneS4-Derived Chelators for Soft Radiometals

“…While oxygen-based crown ethers strongly bind alkali and alkaline earth metal ions, their thioether analogues show distinct preference for the much softer late transition metals [ 24 ]. The complexation of [16]aneS4 (and derivatives thereof) with various transition metals has been studied intensively ( Table 1 ) [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. Its application in radiopharmaceutical chemistry remains limited, however, and to date only a few examples have demonstrated complexation between a soft radiometal and [16]aneS 4 .…”

Synthesis, structure, and complexation behavior of 14‐ and 28‐membered partially unsaturated thiacrown ethers

“…Following the synthesis of the first thiacrown ether by Meadow and Reid [1], thiacrown ethers of various sizes have been synthesized [2][3][4]. Unsaturated thiacrown ethers, of which all sulfur atoms are connected by carbon-carbon double bonds, were Dedicated to Professor Kin-ya Akiba on the occasion of his 75th birthday.…”

Studies of Flerovium and Element 115 Homologs with Macrocyclic Extractants

“…Synthetically it is possible to replace the oxygen donor atoms in crown ethers with other donor atoms. This was first achieved accidentally by Meadow and Reid in 1934 by replacing the oxygen atoms with sulfur atoms in 18C6[170]. This discovery was more than 30 years before the work of Pederson on crown ethers and the first work by Rosen and Busch on macrocyclic thioethers[171].…”