Calculations of the optical absorption spectra of spherical particles of silver with a radius (r) of 10 to 80 nm in water were performed. The single intense absorption band for small particles (r = 10 rim) with a maximum at about 395 nm is gradually broadened and shifted to the long-wave region with an increase in the particle size (to 435 nm at r = 40 nrn). In the case of large particles, the band splits into several components absorbing light in the visible spectral region. The results are in good agreement with the optical characteristics of colloidal solutions of silver obtained upon radiochemical reduction of Ag ~-ions in aqueous solution.The action of lithium butyl acetylenide in THF causes 4,4-diethyl-l,2-dithiolane to undergo ring-opening to form 2,2-diethyl-4-thia-5-decyne-l-thiol, which cyelizes to give 2-butyl-6,6-diethyl-5,6-dihydro-1,4-dithiepin by either a homolytic or a nucleophilic mechanism.
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