90 research outputs found
Mild N-Alkylation of Amines with Alcohols Catalyzed by Acetate Ruthenium Complexes
The formation of C-N bonds for the preparation of amines compounds is a reaction of high
relevance for the synthesis of bulk and fine chemicals (1). The preparation of several drug
molecules involves N-substitution transformations that are usually performed by reaction of
amines with alkylating agents or via reductive amination. In this context, the catalytic Nalkylation
of amines using environmentally friendly alcohols as alkylating reagents and
affording water as only byproduct, is an attractive atom-economic way for the C-N bond
formation (2,3).
We report here the straightforward synthesis of the carboxylate ruthenium complexes
of formula Ru(OAc)2(diphosphane)(CO)n (n = 0, 1). These compounds are efficient catalysts
for the N-alkylation of amines using primary alcohols under mild reaction conditions, with an
alcohol / amine molar ratio of 10-100. Evidence has been provided that in catalysis a
monohydride species is formed through an equilibrium reaction
Optimization of tetrazolium tests to assess the quality of Platymiscium floribundum , Lonchocarpus muehlbergianus and Acacia polyphylla DC. Seeds
Influência da temperatura de armazenamento na qualidade das sementes de Caesalpinia peltophoroides Benth. (sibipiruna)
Germinação de sementes de pau-ferro submetidas a diferentes condições de armazenamento, escarificação química, temperatura e luz
Limites de confiança para variáveis em análises de sementes de espécies florestais exóticas
Germination and vigor of Dimorphandra mollis benth. seeds under different temperatures and substrates
Efeitos do estresse hídrico sobre o desempenho germinativo da semente de faveira (Clitoria fairchildiana R.A. Howard. - Fabaceae) de diferentes tamanhos
Germinação de sementes de dalbergia nigra (Vell.) Allemao ex Benth. (Fabaceae-Papilionoideae) no armazenamento
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