The sharpening of the 1H n.m.r. spectrum of the BH4 hydrogens of (Ph3P)2CuBH4 into a singlet resonance at low temperature indicates efficient quadrupole induced 10B and 11B spin relaxation (“thermal” decoupling) and apparent rapid intramolecular exchange on the 1H n.m.r. time scale at –110°.
M. Grace, H. Beall and C. H. Bushweller, J. Chem. Soc. D, 1970, 701 DOI: 10.1039/C29700000701
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