The Crystal and Molecular Structure of 1,2-Dithiolane-4-Carboxylic Acid.

Raman spectra of strained disulfides. Effect of rotation about sulfur-sulfur bonds on sulfur-sulfur stretching frequencies

“…and 17 are consistent with the observation that compounds 14 and 15, which have nearly identical CCSSCC conformations,15™18 have solid and solution-phase ¡/(S-S) bands at ~510 cm-1. These assignments are summarized in column 4 of Table V.…”

“…X-Ray Structural Data. In Table IV are listed the structural parameters for the CCSSCC groups of compounds [4][5][6]13,14,16,17,19, and several other strained disulfides; these have been compiled from x-ray data in the literature.10-20 These data will help in correlating the conformations of the CCSSCC groups in the compounds studied with their Raman spectra. To illustrate the effects of torsion about the 5-S bond on the strengths of the S-S and S-C bonds in strained disulfides, the variations in (S-S), the S-S bond length, and in R(S-C), the S-C bond length, with |x(CS-SC)| are plotted in Figure 2.…”

Calculation of the interaction energy of one molecule with its whole surrounding. II. Method of calculating electrostatic energy

“…(a) Operator D'. Using (20a), (18b) becomes (21) We then express that the integral J is stationary with respect to ¿¡a…”

Vom Hochgenuss zum Gestank

“…Das 1,2‐Dithiolan‐Fünfringsystem ist nicht eben und sterisch gespannt. Während in offenkettigen Disulfiden der R‐S‐S‐R'‐Diederwinkel wegen der Größe des Schwefels fast 90° beträgt, liegt er in der Asparagusinsäure bei 27° (Abbildung ). Dies führt zur gegenseitigen sterischen Behinderung der beiden CH 2 ‐Gruppen im Fünfring und erhöht die Reaktivität der Asparagusinsäure.…”