Selenium and Tellurium Analogs

2-Benzisoselenazolinones were discussed in the earlier review.1 Very little additional work has been reported indeed, the sole reference appears to be one in which 1,2-benzisoselenazolinone was prepared by reaction between 2-selenocyanatobenzoic acid and ammonia [Eq. (9)].132 

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Perfluoroalkyl)dibenzothiophenium salts and their selenium and tellurium analogs are novel perfluoroalkylating agents. The synthesis and reactivity of these compounds are covered by T. Umemoto (Ibaraki, Japan). Finally, the first detailed survey of the chemistry of 1,3-oxazinium and 3-azapyrylium salts for over twenty years is provided by S. Lukyanov (Rostov-on-Don, Russia). 

The reaction of bis-phenylpropargyl ether (321) with tris(triphenylphosphine)rhodium chloride in benzene or toluene led to the formation of the unusual organometallic compound (322), which can be viewed as a derivative of an oxygen-rhodium pentalene system. Reaction of the rhodium complex (322) with sulfur leads to the corresponding 4,6-diphenyl-l,3-dihydro[3,4-c]furan (323). The selenium and tellurium analogs (324) and (325) were made in a similar manner (Scheme 111) (76LA1448). 

Silanols and Siloxanes and Their Sulfiir, Selenium, and Tellurium Analogs... 

We report the first syntheses of the selenium and tellurium analogs of the thermoplastic poly-p-phenylene sulfide (PPS), i.e., PPSe and PPTe, by reaction of p-dihalobenzenes with new alkali chalcogenide reagents under conditions significantly milder than those reported for PPS. The chemical, thermal, structural, and electrical properties of PPSe and PPTe are compared to those of PPS. While PPSe exhibits good thermal stability,... 

Unit cells and space groups of disulfonyl mono- and disulfides are given in Table II, and of trisulfides in Table III, together with those of selenium and tellurium analogs. Data for only one tetrasulfide, the dibenzenesulfonyl compound (95), are available. This has a large unit cell not favorable for... 

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