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Pyrethroid research reflected in the patent hteratur 1963-1986. Engagement of industrial and institutional research groups in the search for new processes for the production of intermediates and active ingredients. Each dot represents one patent apphcation. Underlined are producers of commercial pyrethroids. The years of priorities are shown

Pyrethroid research reflected in the patent literatur 1949-1986. Engagement of industrial and institutional research groups in the search for new active ingredients. Each dot represent one patent application. Underlined are possesors of proprietory pyrethroids. Years of priorities are shown

Pyrethroid structures

Pyrethroids containing chiral cyanohydrin moieties.

Pyrethroids. XX, deltamethrin XXI, fenvalcrate.

Pyrethroids. XX, deltamethrin XXI, fenvalerate.

Pyrethrum extract.

Pyrex beaker is a new one unexposed to the organics.

Pyrex glass apparatus used .

Pyrex glass photolysis vessel with water-cooled quartz probe.

PYRIDATE from n Octyl thiochloroformate.

Pyridazine is easily distorted along the out-of-plane coordinate in the excited S, and T, states . The broken line indicates the nonradiative transition. The rates from the higher vibrational levels are higher than those from the lower levels.

Pyridazine ring formation.

Pyridazine synthesis.

Pyridazine-water complex.

Pyridazines from furans

Pyridazinone structures belonging to clusters identified by the method of Ward .

Pyridin-2-yl -l,2,4-triazole

Pyridine -f Water against the mole fraction of water

Pyridine adduct as initiator for MMA polymerization in THF.

Pyridine adsorption measured by FTIR MCM-48 MW-l after adsorption

Pyridine analogues

Pyridine and pyrimidine are nitrogen-containing aromatic heterocycles with - electron arrangements much like that of benzene. Both have a lone pair of electrons on nitrogen in an sp orbital in the plane of the ring.

Pyridine and pyrimidine are nitrogen-containing aromatic heterocycles with tt electron arrangements like that of benzene. Both have a lone pair of electrons on nitrogen in an sp orbital in the plane of the ring.

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