EQUILIBRATED DYNAMIC MIXTURES TO CONTROL THE RELEASE OF PERFUMING ALDEHYDES AND KETONES
申请人:Herrmann Andreas
公开号:US20140038873A1
公开(公告)日:2014-02-06
The present invention concerns a dynamic mixture obtained by combining, in the presence of water, at least one diamine derivative, comprising at least one heteroaryl moiety, with at least two perfuming aldehydes and/or ketones. The invention's mixture is capable of releasing in a controlled and prolonged manner said perfuming compounds, in particular perfuming ingredients, into the surrounding environment. The invention's dynamic mixture gives rise to a more evenly distributed positive effect for the release of the different carbonyl compounds which are part of the mixture than other examples reported in the prior art.
Understanding the lability of a trans bound pyridine ligand in a saturated six-membered N-heterocyclic carbene based (NHC)PdCl2(pyridine) type complex: A case study
The lability of a trans "throwaway" pyridine ligand in a PEPPSI (Pyridine Enhanced Precatalyst Preparation, Stabilization and Initiation) themed saturated six-membered N-heterocyclic carbene complex namely, (1,3-difurfuryl tetrahydropyrimidin-2-ylidene)PdCl2(pyridine) (2), was investigated with the aid of a combined experimental and computational studies. In this regard, a new saturated six-membered N-heterocyclic carbene complex 2 was synthesized from the reaction of 1,3-difurfuryl tetrahydropyrimidin-1-ium chloride (I) with PdCl2 in the presence of KN(SiMe3)(2) as a base in pyridine. Significantly enough, the complex 2 represents the first structurally characterized example of a PEPPSI themed trans-(NHC)PdX2(pyridine) (X = halide) type of a complex supported over a saturated six-membered N-heterocyclic carbene ligand. The lability of a trans "throwaway" pyridine ligand in 2 was probed by a displacement reaction with PPh3 to yield the corresponding phosphine analog, (1,3-difurfuryl tetrahydropyrimidin-2-ylidene)PdCl2(PPh3) (3), at room temperature under ambient condition. Detailed density functional theory (DFT) studies aimed at understanding the lability of the trans "throwaway" pyridine ligand in 2, against a PPh3 ligand yielding 3, points towards a kinetic factor rather than a thermodynamic one as a reason for the lability of the pyridine in 2. (C) 2012 Elsevier Ltd. All rights reserved.
US9212335B2
申请人:——
公开号:US9212335B2
公开(公告)日:2015-12-15
[EN] EQUILIBRATED DYNAMIC MIXTURES TO CONTROL THE RELEASE OF PERFUMING ALDEHYDES AND KETONES<br/>[FR] MÉLANGES DYNAMIQUES ÉQUILIBRÉS POUR CONTRÔLER LA LIBÉRATION D'ALDÉHYDES ET DE CÉTONES ODORANTS
申请人:FIRMENICH & CIE
公开号:WO2012139912A1
公开(公告)日:2012-10-18
The present invention concerns a dynamic mixture obtained by combining, in the presence of water, at least one diamine derivative, comprising at least one heteroaryl moiety, with at least two perfuming aldehydes and/or ketones. The invention's mixture is capable of releasing in a controlled and prolonged manner said perfuming compounds, in particular perfuming ingredients, into the surrounding environment. The invention's dynamic mixture gives rise to a more evenly distributed positive effect for the release of the different carbonyl compounds which are part of the mixture than other examples reported in the prior art.