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.
M. Driess and H. Pritzkow, J. Chem. Soc., Chem. Commun., 1993, 1585 DOI: 10.1039/C39930001585
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