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When 4,4a-dihydro-3,3-dimethyl-1-phenyl-4,4-bis(trimethylsilyl)- 3H -2-oxa-3-sila-naphthaline (silaoxine C 22 H 34 OSi 3  ( 3 ); orthorhombic, space group  Pna 2 1 ,  Z =4) was thermolized in a CO 2  atmosphere, the corresponding oxasilacyclobutane (silaoxetane)  5  was quantitatively formed. The [2+2] cycloreversion of the silaoxetane  5  occurred at temperatures higher than 120°C to give exclusively Ph 2 C=C(SiMe 3 ) 2  and (Me 2 SiO)  n  . Single crystals of Ph 2 C=C(SiMe 3 ) 2  ( 6 ; monoclinic, space group  C 2/ c ,  Z =8) were isolated from this reaction. When the azasilacyclobutane (silaazetidine) C 25 H 43 NSi 4  ( 4 ; monoclinic, space group  P 2 1 / n ,  Z =4) was reacted with an excess of CO 2  at 100°C an unknown intermediate was formed along with the benzophenonimine Ph 2 C=N(SiMe 3 ). The NMR resonances of this intermediate indicates the formation of the  β -silalactone (silaoxetanone) C 10 H 24 O 2 Si 3  ( 7 ). At temperatures higher than 120°C the silaoxetanone  7  decomposed to give (Me 3 Si) 2 C=C=O and (Me 2 SiO)  n  , respectively.

The chemical behavior of the silaoxine C 22 H 34 OSi 3 and silaazetidine C 25 H 43 NSi 4 towards CO 2