title: Use of crown ethers to isolate intermediates in ammonia-borane dehydrocoupling reactions.
abstract: The presence of 18-crown-6 in the Lewis acid-promoted dehydrocoupling reaction of ammonia borane permits isolation of [(THF)BH2NH3](+) and [BH2(NH3)2](+) cations. [(THF)BH2NH3](+) reacts with Lewis bases to give either boron adducts or by deprotonation at nitrogen to give borazine and ammonia-borane.
authors: Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, UK. rjl1003@cam.ac.uk.
authors: Robert J
authors: RJ
authors: Less
authors: Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, UK. rjl1003@cam.ac.uk.
authors: Raúl
authors: R
authors: García-Rodríguez
authors: Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, UK. rjl1003@cam.ac.uk.
authors: Hayley R
authors: HR
authors: Simmonds
authors: Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, UK. rjl1003@cam.ac.uk.
authors: Lucy K
authors: LK
authors: Allen
authors: Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, UK. rjl1003@cam.ac.uk.
authors: Andrew D
authors: AD
authors: Bond
authors: Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, UK. rjl1003@cam.ac.uk.
authors: Dominic S
authors: DS
authors: Wright