Introduction to the catalytic functions of organozinc catalysts

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Organic zinc must contain hydrocarbons in its molecular formula, such as zinc isooctanoate, zinc naphthenate, Dimethyl zinc, lauryl dibutyl zinc, etc. belong to the organic zinc category. Inorganic zinc refers to zinc compounds that do not contain hydrocarbons (usually containing alkyl groups), such as zinc oxide, zinc chloride, zinc nitrate, etc., which are all inorganic zinc. From the physical appearance, most of the inorganic zinc is white solid crystal, while part of the organic zinc is liquid and part is solid. Inorganic zinc mostly uses its physical properties as fillers, and organic zinc is used as a catalytic phase for proton transfer to accelerate chemical reactions and in some medical fields.

1. The method of zinc supplementation can be to add inorganic zinc or organic zinc to the feed. Inorganic zinc mainly includes zinc sulfate and oxidized zinc. Zinc, zinc carbonate, etc. Organic zinc refers to the complex or chelate formed by organic ligands, such as zinc gluconate, zinc methionine, etc. Different forms of zinc have different utilization rates in the body. Generally speaking, inorganic zinc The biological potency of zinc is lower than organic zinc, and organic zinc is lower than amino acid chelated zinc.

2. Organic zinc refers to the complex (such as zinc gluconate) or chelate (such as zinc methionine) formed by zinc and organic ligands. Amino acid zinc chelates have become the main development trend of trace element zinc additives today.

Most zinc compounds are easily oxidized and will decompose when dissolved in protic solvents. In many reactions, Organozinc reagent needs to be prepared and used immediately and cannot be separated, purified or stored for too long. All reactions using organozinc reagents need to be carried out under the protection of an inert gas, such as nitrogen or argon. Organozinc compoundsThe most common oxidation state is +2. It can be divided into three types: organic zinc halogen compounds (R-Zn-X, where X represents a halogen atom); dialkyl zinc compounds (R-Zn-R, where R represents an alkyl or aryl group); zincic acid Lithium salt or magnesium zincate salt (M+R3Zn-, where M represents lithium or magnesium). Due to the different electronegativities of the carbon and zinc elements: (2.55 for carbon; 1.65 for zinc), the polarity of the carbon-zinc chemical bond points toward the carbon atom.

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