Substituent effects in the n. far.. pi.* transition of ketones

7106 Table I. Reactions of 1,l-Dimethyl-1-silaethene, (CH&Si=CH2 (2), with Silicon Halides at 611 ~

~

~~

O

a

~~~~~

Products Reaction no.

[SiMeZb (mmol)

Substrate

(mmol)

Me2S?SiMe2

1 :1 Adduct

Y

~

1 2 3 4 5 6 7

18.4 13.9 13.3 14.3 9.76 10.1 15.3

SiFa HSiC1, SiC14 MeSiC1, Me2SiC12 Me,SiCl CF,

(-124) (49.8) (20.5) (38 .O) (26.4) (27.2) (112)

-

(zyie1d)c ~

F3SiCH2SiMe2F HC129iCH2SiMe2C1 C13SiCHzSiMepCl ClzMeSiCH2SiMe2Cl C1Me2SiCH2SiMeK1 Me,SiCH2SiMezC1

(44) (22) (20) (16) (13) (