Journal
CATALYSIS COMMUNICATIONS
Volume 9, Issue 6, Pages 1066-1070Publisher
ELSEVIER
DOI: 10.1016/j.catcom.2007.10.008
Keywords
limonene; hydroformylation; hydroaminomethylation; terpenes; secondary amines; tertiary amines
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In this work, we were able to synthesize, in good isolated yields, seven R(+)-limonene derived amines (five of that described for the first time) employing a rhodium catalysed hydroaminomethylation reaction. This protocol consists in an one-pot three step reaction: double bond hydroformylation, aldehyde/amine condensation and imine/enamine hydrogenation. Hydroaminomethylation, besides the high yields, has a high atom economy because just I mol of water is wasted per mol of limonene. Due to our catalytic optimizations, the reaction time was reduced from 48 h (described in the literature) to 10-24 h, as well as limonene isomerization was strongly minimized by the triphenylphosphine added. (c) 2007 Elsevier B.V. All rights reserved.
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