19879-97-1Relevant articles and documents
Preparation method of tiglic aldehyde
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Paragraph 0036; 0037; 0041; 0044, (2020/03/05)
The invention discloses a preparation method of tiglic aldehyde. The preparation method disclosed by the invention comprises the following step: in a solvent, in the presence of a Lewis acid, carryingout Mukaiyama reaction shown in the specification on allyl silyl ether and trimeric acetaldehyde to obtain 3-hydroxy-2-methylbutyraldehyde shown in the formula I. The invention further discloses a preparation method of the 3-hydroxy-2-methylbutyraldehyde. The preparation method has the advantages that the raw materials are cheap and easy to obtain, the preparation operation of the intermediate issimple, the reaction conditions are mild, and large-scale production is easy.
Thermally stable, latent olefin metathesis catalysts
Thomas, Renee M.,Fedorov, Alexey,Keitz, Benjamin K.,Grubbs, Robert H.
scheme or table, p. 6713 - 6717 (2012/02/06)
Highly thermally stable N-aryl, N-alkyl N-heterocyclic carbene (NHC) ruthenium catalysts were designed and synthesized for latent olefin metathesis. These catalysts showed excellent latent behavior toward metathesis reactions, whereby the complexes were inactive at ambient temperature and initiated at elevated temperatures, a challenging property to achieve with second-generation catalysts. A sterically hindered N-tert-butyl substituent on the NHC ligand of the ruthenium complex was found to induce latent behavior toward cross-metathesis reactions, and exchange of the chloride ligands for iodide ligands was necessary to attain latent behavior during ring-opening metathesis polymerization (ROMP). Iodide-based catalysts showed no reactivity toward ROMP of norbornene-derived monomers at 25 °C and upon heating to 85 °C gave complete conversion of monomer to polymer in less than 2 h. All of the complexes were very stable to air, moisture, and elevated temperatures up to at least 90 °C and exhibited a long catalyst lifetime in solution at elevated temperatures.
PREPARATION AND DIENOPHILICITY OF 3-METHYL-4,5-BENZOFURANDIONE
Lee, Junning,Tang, Jin,Snyder, John K.
, p. 3427 - 3430 (2007/10/02)
The o-quinone 3-methyl-4,5-benzofurandione, 1, was prepared in 94percent overall yield from p-benzoquinone and 1-morpholino-propene.The cycloaddition chemistry of 1 with several dienes was examined and found to proceed in good to excellent yields.