properties allows reliable predictions of absoluteconfiguration. The advantage of using more than one chiroptical method for the assignment of absoluteconfiguration is demonstrated. The reliability of the proposed assignment was further confirmed by ECD measurements at variable temperatures and the use of Moscowitz procedure. This allowed the relative energies of the conformers obtained from the calculations
V 3 = 740(5) cal/mol. The hyperfine structure due to the 11 B nuclear quadrupolemoment has also been analyzed, and χ aa = −1.90(24) MHz, χ bb = −1.91(24) MHz, and χ cc = 3.81(22) MHz have been obtained. The total electric dipolemoment determined for the normal species is μ = 1.61(10) D. The molecular structure has been determined from the rotational constants of 10 B, 13 C, CH 3 OBD 2 , CD 3 OBH