1741-01-1Relevant academic research and scientific papers
An improved process for the preparation of trimethylhydrazine and its coupling with an activated acid intermediate
Garcia-Rubio, Silvina,Wilson, Chandra D.,Renner, Deborah A.,Rosser, John O.,Patra, Debasis,Gregory Reid,Pines, Seemon H.
, p. 360 - 362 (2004)
Trimethylhydrazine (TMH) was prepared in two steps from 1,1-dimethylhydrazine, using an easy to scale-up procedure that avoided difficult acid-base extractions. The procedure provided TMH as a solution in 1,4-dioxane, in a form that was easy and safe to handle in a coupling with an enantiomerically pure, sterically hindered, Boc-protected-amino acid, 1. This key coupling reaction in the preparation of 3 was accomplished through the corresponding acid chloride, thereby avoiding the use of expensive coupling reagents.
Ambident reactivities of methylhydrazines
Nigst, Tobias A.,Ammer, Johannes,Mayr, Herbert
supporting information; body text, p. 1353 - 1356 (2012/03/27)
Kinetics versus thermodynamics: Methyl groups increase the nucleophilic reactivity of the substituted position of hydrazines and reduce the nucleophilicity of the adjacent nitrogen center. As a result, the tertiary nitrogen atom of 1,1-dimethylhydrazine is 3000 times more reactive than the NH2 group, but under thermodynamic control substitution of an NH 2 proton occurs (see picture). Copyright
