CHEM01200604012 Dibakar Goswami - Homi Bhabha National ...

and chemical analysis. 1 H NMR spectra (Fig. II.3.9) of III showed olefinic signals at δ
4.91-5.06 and at δ 5.71-5.91 ppm, whereas the allylic protons gave a doublet at δ 1.69
ppm. Its 13 C NMR spectrum (Fig. II.3.10) showed the peak due to allylic carbon at δ 33.1
ppm. An analogous compound, (CH 2 CH=CH 2 ) 2 GaCl, synthesized following a reported
procedure, 88
also provided a similar
1 H NMR spectrum. The sesquibromide,
(CH 2 CH=CH 2 ) 3 GaBr 3 , produced 66b in THF, was not formed in [bmim][Br]. The integration
of the NMR signals for III reached a maximum (~48%) in ~ 3.5 h, and remained steady
even up to 8 h. Addition of 59a to the reaction mixture led to complete depletion of the
signal, confirming III as the active organometallic species.
Fig. II.3.9. 1 H NMR spectrum of III
61