A 1,3,2-oxazaborolidine dimer derived from (S)-alpha,alpha-diphenylprolinol.
The reaction of (S)-alpha,alpha-diphenylprolinol with an excess of borane-tetrahydrofuran complex yields a stable crystalline material with the composition C34H38B2N2O2, which features a borane adduct of a spirocyclic structure with two oxazaborolidine rings joined by a central tetrahedral B atom. This dimeric oxazaborolidine complex, viz. 3,3,3',3'-tetraphenyl-1,1'-spirobi(3a,4,5,6-tetrahydro-3H-pyrrolo[1,2-c][1,3,2]oxazaborole)-7-borane, is the dominant product under various reaction conditions; its crystal structure is consistent with 11B, 1H and 13C NMR and IR analyses.
Department of Chemistry, University of Puerto Rico, Humacao CUH Station, Humacao, PR 00791, USA.
Margarita
M
Ortiz-Marciales
Melvin
M
De Jesús
Eduvigis
E
González
Raphael G
RG
Raptis
Peter
P
Baran
D001713:Biphenyl Compounds / Q000737:chemistry*; D001896:Boron Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019281:Dimerization; D015394:Molecular Structure; D011759:Pyrrolidines / Q000737:chemistry*; D013237:Stereoisomerism
D001713:Biphenyl Compounds; D001896:Boron Compounds; D011759:Pyrrolidines; C010509:prolinol