Cation 1 reacts with the ion , a potential source of hydride, to form 2 . The following...

Cation 1 reacts with the ion , a potential source of hydride, to form 2 . The following data are reported for 2 :

IR: strong bands at 1920, 1857 cm^-1 . ¹H NMR : chemical shift (relative area):

5.46 (2)

5.28 (5)

5.15 (3)

4.22 (2)

1.31 (27)

In addition, a small peak is believed to be hidden under other peaks. 13C NMR : resonance at 236.9 ppm, seven additional peaks and clusters of peaks between 32.4 and 115.7 ppm. Propose a structure for 2 , and account for as much of the experimental data as possible. (See I. Amor, D. García- Vivó, M. E. García, M. A. Ruiz, D. Sáez, H. Hamidov, J. C. Jeffery, Organometallics , 2007 , 26 , 466.)