A 1,3,2‐oxazaborolidine dimer derived from (S)‐α,α‐diphenylprolinol |
| |
Authors: | Margarita Ortiz‐Marciales,Melvin De Jesú s,Eduvigis Gonzá lez,Raphael G. Raptis,Peter Baran |
| |
Abstract: | The reaction of (S)‐α,α‐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. |
| |
Keywords: | |
|
|