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Silaethene Me 2 Si = C(SiMe 3 ) 2  (1), stored as Ph 2 C=NSiMe 3  adducts and regenerated from the adducts at about 100 °C as a reaction intermediate, combines with reactants a-b (e. g. HO-H, RO-H. RCOO-H, RS-H. RHN-H, Ph 2 CN-H, RO-SiR 3 , R 2 N-SiR 3 , Ph 2 CN-SiR 3 , Cl-GeR 3 , Cl-SnR 3 ) with insertion into the a-b bond, with a=b (e.g. 0 = CPh 2 , Me 3 SiN = CPh 2 , CH 2 =CHOMe, cis-piperylene), a=b=c (e.g. RN = N = N, O = N=N). a=b-c=d (e.g. butadiene, isoprene, trans-piperylene, 2,3-dimethylbutadiene, cyclopentadiene, anthracene, benzophenone, N-trimethylsilylbenzophenoneimine) under [2+2]-, [2+3]- as well as [2+A]-cycloaddition and with a=b-c-H (e.g. propene, butenes, isoprene. 2.3-dimethylbutadiene, acetone) under ene reac­tion. According to relative reaction rates, insertion and [2+2]-cycloadditions seem to proceed in two reaction steps, whereas [2+4]-cycloadditions and ene reactions with organic dienes and enes obviously are one step reactions. For relative reactivities cf. Table I.

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Reaktivität des labilen, durch Adduktbildung mit Ph 2 C=NSiMe 3  gespeicherten Silaethens Me 2 Si=C(SiMe 3 ) 2  / Reactivity of the Labile Silaethene Me 2 Si = C(SiMe 3 ) 2 , Stored as Ph 2 C =NSiMe 3  Adducts