Primary-secondary Diamine Research Articles

Enantioselective Synthesis of Functionalized Fluorinated Cyclohexenones via Robinson Annulation Catalyzed by Primary−Secondary Diamines

Primary-secondary diamine catalysts were used to catalyze the asymmetric Robinson annulation to synthesize multiply substituted fluorinated chiral cyclohexenones with two contiguous stereogenic centers, one of which is a fluorinated quaternary chiral center, with excellent enantioselectivities and diastereoselectivities in moderate to good yields.

Enantioselective Friedel–Crafts Alkylation of 4,7‐Dihydroindoles with Enones Catalyzed by Primary–Secondary Diamines

Enantioselective Friedel–Crafts Alkylation of 4,7‐Dihydroindoles with Enones Catalyzed by Primary–Secondary Diamines

ChemInform Abstract: Organocatalyzed Highly Enantioselective Michael Additions of Malonates to Enones by Using Novel Primary—Secondary Diamine Catalysts.

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Primary-Secondary Diamine Catalysts for Malonate Additions to Enones

Primary-Secondary Diamine Catalysts for Malonate Additions to Enones

Organocatalyzed highly stereoselective Michael addition of ketones to alkylidene malonates and nitroolefins using chiral primary-secondary diamine catalysts based on bispidine

Organocatalysts containing primary-secondary diamines based on bispidine have been developed to catalyze the asymmetric Michael addition of ketones to alkylidene malonates and nitroalkenes. The corresponding products were obtained in high yields (up to 99%) with high diastereoselectivities (up to 99:1) and high enantioselectivities (up to 97% ee) under mild conditions using either environmentally benign water as the solvent or no solvent.

Organocatalyzed Highly Enantioselective Michael Additions of Malonates to Enones by Using Novel Primary–Secondary Diamine Catalysts

Michael addition: Several novel primary–secondary diamine catalysts were readily prepared in three steps from commercially available primary amino acids. The catalysts (such as 1) showed excellent catalytic activity and enantioselectivity (up to 99 % yield, >99 % ee) in the asymmetric Michael additions of malonates to enones.

Melt amination of polypropylenes

AbstractAmine (primary and secondary) functional polypropylenes were prepared by the melt blending of maleated polypropylenes with small diamines, including hexamethylenediamine (primary–primary diamine), p‐xylylenediamine (primary–primary diamine), and N‐hexylethylenediamine (primary–secondary diamine), at various diamine/anhydride molar ratios in a batch mixer and a twin‐screw extruder. The experimental conversion data by Fourier transform infrared nearly agreed with the assumption of a complete reaction between the primary amine and anhydride. Chain extensions of the maleated polypropylenes by the diamines were monitored by the torques during mixing and further evaluated by rheological (dynamic shear rheometry) and mechanical measurements. We show that these amino polypropylenes are very effective adhesion promoters and compatibilizers of thermoplastic polyurethanes with polypropylene. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 4217–4232, 2005