Nucleophilic displacement of ammonia from ammonia borane for the preparation of alkylamine-, pyridine- and phosphine-boranes
作者:P. Veeraraghavan Ramachandran、Ameya S. Kulkarni
DOI:10.1039/c4ra03397c
日期:——
A near quantitative and safe preparation of a series of aliphatic amine- and phosphine-boranes from ammonia borane (AB) in refluxing THF has been achieved by exploiting the volatility of ammonia. A one-pot preparation of lithium aminoborohydrides from AB has also been described.
Amine-boranes as Dual-Purpose Reagents for Direct Amidation of Carboxylic Acids
作者:P. Veeraraghavan Ramachandran、Henry J. Hamann、Shivani Choudhary
DOI:10.1021/acs.orglett.0c03184
日期:2020.11.6
Amine-boranes serve as dual-purpose reagents for direct amidation, activating aliphatic and aromatic carboxylicacids and, subsequently, delivering amines to provide the corresponding amides in up to 99% yields. Delivery of gaseous or low-boiling amines as their borane complexes provides a major advantage over existing methodologies. Utilizing amine-boranes containing borane incompatible functionalities
Amine-Boranes: Green Hypergolic Fuels with Consistently Low Ignition Delays
作者:P. Veeraraghavan Ramachandran、Ameya S. Kulkarni、Mark A. Pfeil、Jacob D. Dennis、Jared D. Willits、Stephen D. Heister、Steven F. Son、Timothée L. Pourpoint
DOI:10.1002/chem.201405224
日期:2014.12.15
them to hypergols or decreases their ignitiondelays (IDs) multifold (with white fuming nitric acid as the oxidant). With consistentlylow IDs, amine–boranes represent a class of compounds that can be promising alternatives to toxic hydrazine and its derivatives as propellants. A structure–hypergolicity relationship study reveals the necessary features for the low ID.
leads to the assembly of polymer chains through multiple Lewispairing in their backbone. These new polyboramines are dihydrogen reservoirs that can be used for the hydrogenation of imines and carbonyl compounds. They also display a unique dihydrogen thermal release profile that is a direct consequence of the insertion of the amine–borane linkages in the polymericbackbone.
Studies of aminoboranes. Part II. Pyrolysis of monoalkylamine-boranes: some aminoborane trimers (1,3,5-trialkylcyclotriborazanes) and dimers
作者:M. P. Brown、R. W. Heseltine、L. H. Sutcliffe
DOI:10.1039/j19680000612
日期:——
Trimericaminoboranes (RNH·BH2)3, where R = Me, Et, Pr, Bu, and But, each of which occurs in two forms, have been prepared by pyrolyses of the corresponding amine-boranes RNH2,BH3. The dimeric aminoborane (ButNH·BH2)2 was also obtained from pyrolysis of ButNH2,BH3 and a similar dimer (PriNH·BH2)2 was the only aminoborane which could be isolated from the pyrolysis of PriNH2,BH3. Proton magnetic resonance