Polymerization of Olefins: An Outlook After 50
... The metallocene initiators are termed single-site catalysts as each metal center has the same coordination environment. The resultant polymer has narrower distributions of molecular wt, regiochemistry and stereochemistry. ...
... The metallocene initiators are termed single-site catalysts as each metal center has the same coordination environment. The resultant polymer has narrower distributions of molecular wt, regiochemistry and stereochemistry. ...
Position of Hydrogen in the periodic table. Atomic number of
... catalyst e.g. Pt or Ni under pressure at about 2000 C is called hydrogenation. Vegetable oils turn to semi solid fats by hydrogenation. * Passage of hydrogen under high pressure over powdered coal in presence of a catalyst at a suitable temp. is called hydrogenation of coal. * Hydrogen when passed o ...
... catalyst e.g. Pt or Ni under pressure at about 2000 C is called hydrogenation. Vegetable oils turn to semi solid fats by hydrogenation. * Passage of hydrogen under high pressure over powdered coal in presence of a catalyst at a suitable temp. is called hydrogenation of coal. * Hydrogen when passed o ...
413-420_00_j_o_kones..
... needs to follow a biorefinery model under environmentally sustainable conditions. Where these operate at present, their product range is largely limited to simple materials (i.e. cellulose, ethanol, and biofuels). Second generation biorefineries need to build on the need for sustainable chemical pro ...
... needs to follow a biorefinery model under environmentally sustainable conditions. Where these operate at present, their product range is largely limited to simple materials (i.e. cellulose, ethanol, and biofuels). Second generation biorefineries need to build on the need for sustainable chemical pro ...
Catalysis
... on the enzyme surface and often reduce or completely destroy the catalytic activity of the enzymes 5. The activity of certain enzymes depend upon certain non-protein substances called Co-enzymes. For each enzyme, there is only one co-enzyme 6. Enzymes lose their activity when exposed to ultravoilet ...
... on the enzyme surface and often reduce or completely destroy the catalytic activity of the enzymes 5. The activity of certain enzymes depend upon certain non-protein substances called Co-enzymes. For each enzyme, there is only one co-enzyme 6. Enzymes lose their activity when exposed to ultravoilet ...
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... 3) The presence of sterically hindered groups bound to the Natoms facilitating the reductive elimination of the product from the metal during catalysis. Tolman in 1977 had devised a method for comparing the electrondonating ability of phosphine ligands [11]. This was determined by reacting one equiv ...
... 3) The presence of sterically hindered groups bound to the Natoms facilitating the reductive elimination of the product from the metal during catalysis. Tolman in 1977 had devised a method for comparing the electrondonating ability of phosphine ligands [11]. This was determined by reacting one equiv ...
Steric protection of alkylidene is not needed:
... M=CH2 carbenes: (also M=CH2 species can be isolated) ...
... M=CH2 carbenes: (also M=CH2 species can be isolated) ...
1
... with an oxygen atom [8]-[10]. These reactions are characterized by a common first stage of allylic oxidation where the extraction of a hydrogen atom in the allyl position gives rise to a chemisorbed p-allylic complex on the transition metal. The nature of the subsequent stages determines the type of ...
... with an oxygen atom [8]-[10]. These reactions are characterized by a common first stage of allylic oxidation where the extraction of a hydrogen atom in the allyl position gives rise to a chemisorbed p-allylic complex on the transition metal. The nature of the subsequent stages determines the type of ...
