EFFECT OF BORON-HYDROGEN SPIN-SPIN COUPLING ON THE PROTON MAGNETIC RESONANCE SPECTRA OF SOME OF THE BORANES

Author Institution: Varian AssociatesProton magnetic resonance spectra of several of the boranes have been studied and have, in general, yielded interesting results. However, the coupling between the nuclear spins of the $B^{11}$ nuclei and the protons results in an overlapping multiplet structure of the lines which has complicated the assignments. Experiments have been performed in which the $B^{11}$ nuclei were excited at their resonant frequency while the proton magnetic resonance spectra were obtained in the usual way. By this means, it has been possible to collapse the multiplet structures of the spectra and to verify the assignments as they would apply in the unsplit case. Spectra of diborane, borohydride ions, and pentaborane are offered as examples of the application of this technique

Lewis-acid-induced electrophilic substitution in indoles with acetone. Part 2

The electrophilic substitution reaction of indole with acetone in the presence of boron trifluoride has been followed and the structures of two of the three products isolated have been established. The structure of compound (1), dimer II, was determined by X-ray diffraction methods as crystals from methanol were monoclinic, space group Cc, and had cell parameters a= 13.383(2), b= 14.064(2), c= 11.638(4)Å, β= 114.74(2)°, Z= 4. The structure was refined to a final R value of 0.068