Results 131 to 140 of about 928 (176)
Some of the next articles are maybe not open access.
Pyrazolines X. Kinetics for the pyrolysis of some deuterated 1-pyrazolines in solution
Canadian Journal of Chemistry, 1969The 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
openaire +1 more source
Discovery of novel pyrazoline insecticides
Pest Management ScienceAbstractBACKGROUNDThe 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 +5 more
openaire +2 more sources
Synthesis of the Steroidal Pyrazolines.
ChemInform, 2004AbstractFor Abstract see ChemInform Abstract in Full Text.
Shamsuzzaman Shamsuzzaman +1 more
openaire +1 more source
4-Isopropylidene-3,3,5,5-tetramethyl-Δ1-pyrazoline - an almost flat pyrazoline
Tetrahedron Letters, 1982Abstract 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 +2 more
openaire +1 more source
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 +4 more
openaire +1 more source
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 +4 more
openaire +1 more source
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 +2 more
openaire +1 more source
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 +2 more
openaire +1 more source
Journal of Pharmaceutical Negative Results, 2015
Aim: The Present study is to investigate the antimycobacterial activity of pyrazoline, phenyl pyrazoline and isooxazoline moiety containing lupeol. The main purpose to show insignificant antimicrobial activity of these lupeol derivatives and hence that further researchers do not waste time to investigate antitubercular activity of these group ...
Vandana Khattar, Ankita Wal, AK Rai
openaire +1 more source
Aim: The Present study is to investigate the antimycobacterial activity of pyrazoline, phenyl pyrazoline and isooxazoline moiety containing lupeol. The main purpose to show insignificant antimicrobial activity of these lupeol derivatives and hence that further researchers do not waste time to investigate antitubercular activity of these group ...
Vandana Khattar, Ankita Wal, AK Rai
openaire +1 more source
Δ1‐pyrazolines: (Pyrazol and pyrazoline derivatives II
Recueil des Travaux Chimiques des Pays-Bas, 1943AbstractΔ1‐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 ...
openaire +1 more source
ChemInform, 2015
AbstractA variety of the spirocyclic heterocycles are synthesized in good yields by annulation reactions of corresponding 3‐alkylideneoxindoles or 3‐alkylidenebenzofuranones with Huisgen zwitterions.
Changjiang Yang +5 more
openaire +1 more source
AbstractA variety of the spirocyclic heterocycles are synthesized in good yields by annulation reactions of corresponding 3‐alkylideneoxindoles or 3‐alkylidenebenzofuranones with Huisgen zwitterions.
Changjiang Yang +5 more
openaire +1 more source
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 +3 more
openaire +1 more source
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 +3 more
openaire +1 more source