Low temperature infrared spectral data are given for the adducts H3BC(O)N(CH3)3, D3BC(O)N(CH3)3, H3BC(O)N(CD3)3, D3BC(O)N(CD3)3 over the range 3000 to 300 cm−1. Boron-11 NMR data are given for H3BCO and H3BC(O)N(CH3)3. The spectra allow the assignment of the structure of the adducts as (CH3)3N→C=O→BH3.
James C. Carter, George W. Luther, and Alfred L. Moyé, "Infrared Spectra of Trimethylamine-Carbon Monoxide-Borane and Its Deuterated Derivatives," Appl. Spectrosc. 28, 427-430 (1974)