摘要:
A targeted compound is produced simply, efficiently and selectively. Specifically provided are a method for producing (2,4,4-trimethyl-2-cyclohexene)methanol, comprising the steps of: reacting the carbonyl group of 2,4,4-trimethyl-2-cyclohexenone (1) to obtain 1-methylene-2,4,4-trimethyl-2-cyclohexene (2) and reacting the exocyclic double bond of Compound (2) to obtain the (2,4,4-trimethyl-2-cyclohexene)methanol (3); and a method for producing a (2,4,4-trimethyl-2-cyclohexenyl)methyl ester compound, comprising a step of esterifying Compound (3) to obtain the (2,4,4-trimethyl-2-cyclohexenyl)methyl ester compound (4).
摘要:
It is intended to provide a method of rapid methylation of an aromatic compound or an alkenyl compound, which is capable of obtaining an aromatic compound or an alkenyl compound labeled with a methyl group or a fluoromethyl group under a mild condition rapidly in high yield using an organic boron compound whose toxicity is not so high as a substrate; a kit for preparing a PET tracer to be used in the same, and a method of producing a PET tracer using the same. In an aprotic polar solvent, methyl iodide or X-CH2F (wherein X is a functional group which can be easily released as an anion), an organic boron compound in which an aromatic ring or an alkenyl group is attached to boron are subjected to cross-coupling in the presence of a palladium(0) complex, a phosphine ligand, and a base.
摘要:
Catalytic complexes including a metal atom having anionic ligands, at least one nucleophilic carbene ligand, and an alkylidene, vinylidene, or allenylidene ligand. The complexes are highly stable to air, moisture and thermal degradation. The complexes are designed to efficiently carry out a variety of olefin metathesis reactions.
摘要:
A method for reactivating a ruthenium catalyst, comprising the steps of bringing a ruthenium catalyst whose activity has been reduced due to the use in the hydrogenation of unsaturated organic compounds into contact with oxygen in a liquid phase, and holding the catalyst under a lower partial pressure of hydrogen than that in the hydrogenation and at a temperature which is not lower than the hydrogenation temperature minus 50 DEG C.
摘要:
A process for the cyclodimerization of 1,3-butadienes to 4-vinylcyclohexenes. The process involves contacting a butadiene with a copper(I)-aluminosilicate zeolite prepared by (a) an impregnation method, or (b) heating a solid mixture of a copper salt and the zeolite, or (c) contacting vapors of a copper salt with the zeolite. The catalysts exhibit long life and good activity in the claimed process. The impregnated Cu(I)-catalyst is claimed. A second process for the cyclodimerization of 1,3-butadienes to 4-vinylcyclohexenes. The process involves contacting a butadiene with a catalyst containing copper(I) ions supported on a carrier in the presence of a hydroxylic solvent.
摘要:
Kontinuierliche Herstellung von Cyclohexen durch partielle Hydrierung von Benzol mit Wasserstoff in Gegenwart von Wasser und Rutheniumkatalysatoren bei erhöhter Temperatur und erhöhtem Druck, wobei man Benzol gasförmig zuführt und gebildetes Cyclohexen gasförmig austrägt, und der Katalysator in einer flüssigen, wäßrigen Phase gelöst oder suspendiert vorliegt.