E46607

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Organocatalytic asymmetric direct alpha-alkynylation of cyclic beta-ketoesters.

Thomas B Poulsen et al.

Journal of the American Chemical Society, 129(2), 441-449 (2007-01-11)

The first organocatalytic enantioselective direct alpha-alkynylation of beta-ketoesters and 3-acyl oxindoles is described. It is demonstrated that activated beta-halo-alkynes undergo nucleophilic acetylenic substitution catalyzed by chiral phase-transfer compounds to afford the alkynylated products in high yields and excellent enantioselectivities. The

Alkyne activation and polyhedral reorganization in benzothiazolate-capped osmium clusters on reaction with diethyl acetylenedicarboxylate (DEAD) and ethyl propiolate.

Kh Mahid Uddin et al.

Dalton transactions (Cambridge, England : 2003), 46(39), 13597-13609 (2017-09-28)

The reactivity of the face-capped benzothiazolate clusters HOs

Helvetica Chimica Acta, 89, 2918-2918 (2006)

Influence of harvesting technique and maceration process on aroma and phenolic attributes of Sauvignon blanc wine.

Kenneth J Olejar et al.

Food chemistry, 183, 181-189 (2015-04-13)

Sauvignon blanc wines are characterised by their varietal aromas and low phenolic content. Mechanical harvesting has been shown to increase several varietal aromas. Likewise, maceration techniques have produced increases in phenolic content and antioxidant activity, but these can also alter

Indications of the prominent role of elemental sulfur in the formation of the varietal thiol 3-mercaptohexanol in Sauvignon blanc wine.

Leandro Dias Araujo et al.

Food research international (Ottawa, Ont.), 98, 79-86 (2017-06-15)

Elemental sulfur is a fungicide traditionally used to control Powdery Mildew in the production of grapes. The presence of sulfur residues in grape juice has been associated with increased production of hydrogen sulfide during fermentation, which could take part in

Development of a gold-multifaceted catalysis approach to the synthesis of highly substituted pyrroles: mechanistic insights via Huisgen cycloaddition studies.

Simbarashe Ngwerume et al.

The Journal of organic chemistry, 78(3), 920-934 (2012-12-29)

A novel gold-catalyzed method for the regioselective synthesis of highly substituted pyrroles directly from oximes and alkynes was developed via independent optimization of two key steps of the process. Importantly, a cationic gold(I) species was shown to activate multiple steps

Co-evolution as Tool for Diversifying Flavor and Aroma Profiles of Wines.

Peter Morrison-Whittle et al.

Frontiers in microbiology, 9, 910-910 (2018-06-06)

The products of microbial metabolism form an integral part of human industry and have been shaped by evolutionary processes, accidentally and deliberately, for thousands of years. In the production of wine, a great many flavor and aroma compounds are produced

Cellulose-based hybrid glycosilicones via grafted-to metal-catalyzed hydrosilylation: "When opposites unite".

Mikhail V Dobrynin et al.

Carbohydrate polymers, 241, 116327-116327 (2020-06-09)

Hydrosilylation catalyzed by the rhodium(I) complex [Rh(acac)(CO)2] or platinum(0)-based Karstedt's catalyst was employed to combine hydrophilic propargylated hydroxyethyl cellulose and hydrophobic hydride-terminated polydimethylsiloxane to give polymer hybrid structures. The final polymers were characterized by FTIR, solid state 1H, 13C and

The impact of postharvest ultra-violet light irradiation on the thiol content of Sauvignon blanc grapes.

Katie Parish-Virtue et al.

Food chemistry, 271, 747-752 (2018-09-22)

Sauvignon blanc grapes were exposed to an ultra-violet (UV) light source post-hand harvest (whole bunches) or post-machine harvest. The thiol precursors S-3-(hexan-1-ol)-l-cysteine (Cys-3MH) and S-3-(hexan-1-ol)-l-glutathione (GSH-3MH) were quantified in the juices before and after UV treatment. Results showed that irradiation

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