Cyclooctatetraene 1,2,3-trimethyl

Later Walton and his co-workers46 could show that 2 equivalents of 2-trimethyl-silyl-ethyne-magnesiumbromide couple with cyclooctatetraene dibromide to form l,12-bis(trimethylsilyl)dodeca-3,5,7,9-tetraene-l,l 1-diyne (47). 

A similar dilithium reagent derived from l,l-bis(trimethyl silyl)ethylene has been used for the protecting ligand of the first monomeric stannylene (equation 8) and later, of various kinetically stabilized species (vide infra). Cyclooctatetraene undergoes l,4-(hsilylation as shown below (equation 9). 

Ta( -COT )Me3 (87) was prepared from the reaction of TaCl2Me3 with Li2(COT ) [COT = l,4-bis(trimethyl-silyl)cyclooctatetraene]. It reacts with (NHPp2Et)Cl to yield -pentalene (88). ... 

C20H2 eCrOsSia f Tricarbonyl-[4-methoxy-4-T -phenyl-2,3-bis(trimethyl-silyl)-l,3-butadien-1-one]-chromium, 45B, 997 CaoHa eRu, (rj -Cyclooctatetraene) (T -hexamethylbenzene) ruthenium(O), 46B, 915... 

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