Dynamic NMR Studies of a Potential Chiroptical Switch Based on Dithiocarbamate−Iminodithiolane Interconversion
摘要:
[GRAPHICS]Variable temperature NMR spectra of the chiral spiro[(4-N,N-dimethyldithiocarbamato)-(2-N,N-dimethylimino)-1,3-dithiolane-5,9'-xanthene] show complex dynamics including degenerate interconversion of the dithiocarbamate and iminodithiolane groups. The rate of this switching process can be controlled by chemical modification: the analogous spiro[dithiolane-fluorene] derivative shows no interconversion. These novel materials have potential application as molecular switching elements in information storage devices.
Novel bonding geometry and valence tautomerism of 4-(N,N-dimethyldithiocarbamato)-2-dimethyliminio-1,3-dithietane tetraphenylborate, [Me<sub>2</sub>NCS<sub>2</sub>·CH·S<sub>2</sub>CNMe<sub>2</sub>]<sup>+</sup>Ph<sub>4</sub>B<sup>–</sup>
作者:Robert R. Schumaker、Motomichi Inoue、Michiko B. Inoue、Michael A. Bruck、Quintus Fernando
DOI:10.1039/c39910000719
日期:——
A ring-opening/ring-closing tautomerism in solution of the title compound is deduced from the temperature dependence of the 1H NMR spectra; the molecular structure found by X-ray crystal analysis is favourably oriented for this tautomerism.
Metal complexes of sulphur ligands. Part III. Reaction of platinum(<scp>II</scp>)NN-dialkyldithiocarbamates, O-ethyl dithiocarbonate (xanthate), and OO′-diethyl dithiophosphate with tertiary phosphines
作者:J. M. C. Alison、T. A. Stephenson
DOI:10.1039/dt9730000254
日期:——
Evidence is presented to show that the reaction of all M(S–S)2 compounds [M = Pt, Pd; (S–S)–=–S2CNR2(R = Me, Et), –S2COR (R = Et, PhCH2), –S2P(OEt)2, and –S2PR2(R = Me, Et, Ph)] with tertiaryphosphines occurs by stepwise cleavage of metal–sulphur bonds to generate four-co-ordinate compounds of formulae [M(S–S)2PR′3] and [M(S–S)(PR′3)2](S–S) with unidentate/bidentate (III) and ionic/bidentate (IV)
A NEW REAGENT FOR ALDEHYDE SYNTHESIS: METHYLENEBIS(<i>N</i>,<i>N</i>-DIMETHYLDITHIOCARBAMATE)
作者:Takeshi Nakai、Makoto Okawara
DOI:10.1246/cl.1974.731
日期:1974.7.5
Treatment of the title compound with n-butyllithium produces the lithiomethylene derivative (4) . The reagent 4 so generated has been shown to serve effectively as an equivalent of the formyl anion by alkylation of 4 with alkyl halides followed by hydrolysis with mercuric ion to the corresponding aldehyde.