71831-17-9Relevant academic research and scientific papers
Synthesis and properties of novel medium-sized heterocyclic compounds containing two sulfur atoms in the ring and synthetic approaches to conjugated cyclic disulfonium ylides
Shimizu, Hiroshi,Watanabe, Hiroyoshi,Mizuno, Masahiro,Kataoka, Tadashi,Hori, Mikio
, p. 139 - 150 (2007/10/03)
Tribenzo[bf,h][1,4]dithiecin (8) was prepared by coupling 2,2'- bis(bromomethyl)biphenyl (10) with 1,2-benzenedithiol (11) in the presence of Nail in acetonitrile. Another novel dithiecin derivative, 1,8-dihydro-2,7benzodithiecin (9) was synthesized by coupling of 1,4-dimercapto-2,3-Oisopropylidene-Lg-threitol (13a) with α,α'-dibromo-o-xylene (12), followed by hydrolysis and subsequent dehydration via the mesylate derivative (16). The benzodithiecin (9) was also prepared by treatment of dithiol (18) with butadiyne along with α,α'-bis(1-buten-3-ynylthio)-o-xylene (19) as a byproduct. Compound (19) was subjected to an intramolecular coupling reaction using CuCl-pyridine-O2 in benzene to yield the 12-membered ring compound (23). We also describe our effort to prepare the corresponding cyclic diylide compounds from the above new dithiecins (8) and (9), and known dithiecin (7).
STEREOCHEMISTRY OF SEVEN-MEMBERED HETEROCYCLES. XXIX. DYNAMIC 1H NMR SPECTROSCOPY AND CONFORMATIONAL CHARACTERISTICS OF 1,3-DITHIA-5-CYCLOHEPTENES
Klimovitskii, E. N.,Strel'nik, D. Yu.,Il'yasov, K. A.,Klochkov, V. V.
, p. 920 - 926 (2007/10/02)
It was shown by dynamic 1H NMR spectroscopy that 1,3-dithia-5-cycloheptene and its 2-methyl (phenyl) derivatives in carbon bisulfide solution are characterized by an equilibrium between the chair and boat forms.The conformational free energy of the cis-bu
