Dithiole Series

The colorability of this series is rather poor although electron-withdrawing groups (e.g., COOC2H5, at C4 and C5 ) improve it (see 245, Table 20). 

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In the 1,2-dithiole series such imines are readily isolated they can be alkylated or protonated, e.g. (448) (449) (66AHC(7)39). 

Treatment of a series of 1,2-dithiols (136) including ds-cyclohexane-1,2-dithiol with AI2CI6 in CH2CI2 at 25°C led to persistent ESR signals due to the corresponding 1,2-dithietane radical cations (g = 2.0187 0.0003)... 

The structure of [Mo3S4(dmit)3] (dmit=l,3-dithiole-2-thione-4,5-dithiolate) represents one of the rare examples of M3S4 clusters where each metal atom appears as pentacoordinate instead of its more common type-I structure octahedral environment [39]. Complexes [M3Q4(dmit)3] (M = Mo, W Q = S, Se) degrade in air with an almost quantitative yield and afford a series of M(V) dimers of formula [M202(//-Q)2(dmit)2] where the oxygen atoms are in a syn configuration. 

Winter, C. S. Oliver, S. N. Rush, J. D. Hill, C. A. S. Underhill, A. E. Third-order Optical Nonlinearities in Metal Dithiolate Complexes. In Organic Molecules for Nonlinear Optics and Photonics Messier, J., Kajzar, F., Prasad, P., Eds. NATO ASI Series E, 194 Kluwer Boston, 1991 pp 383-390. 

In the 1970s, Kishi published a series of landmark papers [36] describing the total syntheses of ( )-dehydrogliotoxin (1973) [36b], ( )-sporidesmin A (1973) [36c], ( )-gliotoxin (1976) [36d], and ( )-hyalodendrin (1976) [36e] in which he employed a new method for epidithiodiketopiperazine synthesis (Scheme 9.4). Cognizant of the harsh conditions required in all of the sulfur incorporation methods developed at the time, it was determined that thiolation would be performed in the early stages of the syntheses. A dithiol intermediate obtained in a similar fashion to Trown s epidithiodiketopiperazine was protected as a dithioacetal, and after elaboration of this core diketopiperazine structure, the dithioacetal was unraveled under mild conditions in the final steps to afford the target epidisulfides. 

Elimination of hydrogen halides from dihalogenoorganylboranes by reaction with ferrocene-1,1 -dithiol resulted in l,3-dithia-2-boryl[3]ferrocenophanes.170 These borylferrocenophanes were air sensitive, but were characterized by NMR, MS, and elemental analysis.170 A series of l,3-dibora-2-X-[3]fer-rocenophanes (X=S, Se, Te) were prepared and characterized and the crystal structure of [Se N Pr2)BC5Fl4 2Fe] has been reported.171... 

Crosstalk has been discussed fairly extensively, as one of a series of interference phenomena that can lead to a different kind of control of molecular transport than has been discussed in Sect. 7.4. It is also possible to observe intramolecular interference effects. For example, with cross-conjugated molecules [163] or benzene dithiol linked in the 1,3 (or meta) configurations [164-171], both are expected to show substantially reduced transport. 

A series of bridged [7]thiaheterohelicenes 131 with a variety of helical pitches have been prepared from 2,13-bis(chloromethyl)thiaheterohelicene 130 with alkyl dithiols (Equation 34) <2002JOC1795>. 

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