Entry

Si/Al pairs^a

Temp./˚C

CO₂ pressure/Mpa

Isolated yield^b/%

1

Me₃SiCl/AlCl₃

70

5.5

62

2

Me₂PhSiCl/AlCl₃

70

5.5

83

3

MePh₂SiCl/AlCl₃

70

5.5

92

4

Ph₃SiCl/AlCl₃

70

5.5

95

5

--/AlCl₃

70

5.5

78