Rd. Adams et al., A simple route to thiacrowns. Catalytic macrocyclization of thiirane by cationic manganese carbonyl complexes, INORG CH C, 4(11), 2001, pp. 671-673
Thiirane is transformed catalytically into the symmetric thiacrowns: 1,4.7,
10-tetrathiacyclododecane, 12S4, 1,4.7,10,13-pentathiacyclopentadecane, 15S
5; and 1,4,7.10.13,16-hexathiacyclooctadecane, 18S6, when treated with the
manganese carbonyl monocations: [Mn(CO)(4) (L) (NCMe)](+), L =CO, PPh3, PMe
2Ph and PEt3 at room temperature. 12S4 is the major thiacrown product. Cons
iderable amounts of polymer are also formed. The phosphine-substituted cata
lysts are considerably more active and give better yields of the thiacrowns
than the parent carbonyl, but they also give more polymer side product. (C
) 2001 Elsevier Science B.V. All rights reserved.