Results 131 to 140 of about 950 (182)

Discovery of novel pyrazoline insecticides

Pest Management Science
AbstractBACKGROUNDThe pyrazoline insecticides, invented by Philips Duphar in the 1970s, provide excellent control of lepidopterans and coleopterans and introduced a novel mode of action (MoA) as sodium‐channel‐blocking insecticides, but were not commercialized due to unacceptable persistence.
Rupsha Chaudhuri, Smriti Khanna, Pravin Lokhande, Vikas Sable, Vincent L. Salgado, Barbara J. Wedel   +5 more
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Pyrazolines X. Kinetics for the pyrolysis of some deuterated 1-pyrazolines in solution

Canadian Journal of Chemistry, 1969
The kinetics and product distribution have been measured for the pyrolysis of 3-methyl-3-carbo-methoxy-1-pyrazoline (1) and its 4,4-d2 and 5,5-d2 analogues in tetralin, n-butyl phthalate, nitrobenzene, and formamide. The isotope effect kH/kD for 1-5,5-d2 of 1.22 and for 1-4,4-d2 of 1.36 is consistent with a mechanism involving migration of the C-4 ...
Donald E. McGreer, Ian M. E. Masters
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Synthesis of the Steroidal Pyrazolines.

ChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Shamsuzzaman Shamsuzzaman, Nazish Siddiqui   +1 more
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4-Isopropylidene-3,3,5,5-tetramethyl-Δ1-pyrazoline - an almost flat pyrazoline

Tetrahedron Letters, 1982
Abstract The X-ray crystallographic structure of the title compound 6 shows that it is almost planar. This helps to explain a number of peculiar features in the chemistry of α-methylated pyrazolines.
Richard J. Bushby, Stephen Mann, Walter S. McDonald   +2 more
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Steroidal pyrazoline and pyrazole

Journal of Chemical & Engineering Data, 1987
Synthese des composes du titre a partir de l'acetoxy-3 pregnene-5one-20 et du pyridinecarbaldehyde ...
Charalambos Camoutsis, Sotirios Nicolaropoulos, Panayotis Catsoulacos   +2 more
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Pyrazolines and their rearrangement to form pyrazoles. II. (Pyrazole and pyrazoline derivatives, IV)

Recueil des Travaux Chimiques des Pays-Bas, 1943
AbstractUpon the addition of diphenylenediazomethane to the methyl esters of acetylene dicarbonic acid, of phenylpropiolic acid and of propiolic acid, pyrazolenines are formed which, under different circumstances and with the migration of several groups, undergo rearrangement to give pyrazoles.
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Δ¹‐pyrazolines: (Pyrazol and pyrazoline derivatives II

Recueil des Travaux Chimiques des Pays-Bas, 1943
AbstractΔ1‐pyrazolines, in which the double bond is situated between the two nitrogen atoms can be prepared by the addition of diphenyldiazomethane to the diphenyl ester of citraconic acid and to the trimethyl ester of aconitic acid. These compounds split off nitrogen at higher temperatures forming cyclopropane derivatives.Diphenyl diazomethane ...
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New Pyrazoline Derivatives

Collection of Czechoslovak Chemical Communications, 1994
The biological activity of azoles, pyrimidines as well as pyrazolines are of interest. Formation of pyrazolines and related compounds from hydrazine derivatives and α,β-unsaturated carbonyl compounds is very common. Pyrazoline fused with different heterocyclic nuclei at position 4 and 5 have been reported.
F. M. Abd El Latif, A. S. Maghraby, M. A. Barsy, M. Z. A. Badr, D. Dopp   +4 more
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PYRAZOLINES: PART II

Canadian Journal of Chemistry, 1960
Product analysis has been carried out on the pyrolysis reaction in the liquid and vapor phase of 4- and 5-methyl-3-carbomethoxy-Δ2-pyrazolines and 3-methyl-3-carbomethoxy-Δ1-pyrazoline. The proportion of cyclopropane product was found to be greater than earlier reports had indicated and was higher for the vapor-phase pyrolysis than for the liquid ...
Donald E. McGreer, Wing Wai, George Carmichael   +2 more
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PYRAZOLINES: VI. THE STEREOCHEMISTRY IN THE PYROLYSIS OF PYRAZOLINES FOR THE C₃ AND C₅ POSITIONS OF THE PYRAZOLINE MOLECULE

Canadian Journal of Chemistry, 1965
cis- and trans-3.5-Dimethyl-3-carbomethoxy-Δ1-pyrazoline (IV and V) have been separated, and product analysis for the pyrolysis and photolysis of these compounds has been completed. The cyclopropane products are formed with some change in the relative configuration of the cis–trans groups in both reactions. The α,β-unsaturated olefin product is formed
Donald E. McGreer, Norman W. K. Chiu, Magnus G. Vinje, Ken C. K. Wong   +3 more
openaire   +1 more source