The reaction of the 1,1-diisityl-3,3,3-triisopropyldisilaphosphene 1(isityl = 2,4,6-triisopropylphenyl) and the analogous disilaarsene 2 with 1,6-diisocyanohexane results in the formation of the unusual tricyclic macroheterocycles 5 and 6; the molecular structures of 5 and 6 have been established by X-ray crystallographic analysis.
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Drieß et al. (1993) studied this question.
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