- On the stereochemistry of the Horner-Emmons reaction between 3-functionally substituted 2-methyl-2-propenylphosphonates and aliphatic aldehydes 7. Quaternary ammonium phase transfer catalysts in a stereoselective synthesis of esters of 3-methyl-2E,4E-alkadienoic acids
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The reaction of diethyl 3-ethoxycarbonyl-2-methyl-2-propenylphosphonate (1a) with 3-methylbutanal (2) in heterogeneous MOH (solid)-behzene systems in the presence of 5-10 mol.percent of benzyltriethylammonium chloride (BTEAC) gives the reaction product (3) with a higher, for M = K, or lower, for M = Li, ratio of 2E,4E- and 2Z,4E-stereoisomers than that observed in the absence of BTEAC.Tetrabutylammonium bromide (TBAB) as a catalyst of the reaction 1a + 2 -> 3 in the system KOH (solid) - wet benzene leads to a higher : ratio than BTEAC; this ratio grows from 44:56 without TBAB to 80:20 at 100 mol.percent of TBAB.In the latter case...
- Kryshtal', G. V.,Zhdankina, G. M.,Serebryakov, E. P.
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- Method for exterminating termites
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A method for exterminating termites comprising using an entomopathogenic nematode together with an inset-growth regulator or a slow-acting insecticide, wherein insecticidal effects are reinforced compared with the cases using singly the entomopathogenic nematode and the insect-growth regulator or the slow-acting insecticide, respectively, and a bait station for exterminating termites that contains an entomopathogenic nematode with an insect-growth regulator or a slow-acting insecticide. According to the invention, emission of harmful chemicals to environment can be suppressed. The invention is nonpoisonous for human being and livestock, and is useful for indoor or outdoor extermination of termites.
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- PROCESS AND MEANS FOR THE ERADICATION OF TICKS IN THE HABITATS OF SMALL MAMMALS
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Disclosed is a process for using a compound according to formula (I) or formula (II) to prepare a mixture for the eradication of ticks in the living quarters of small mammals, especially cats and dogs. Said process consists in applying as needed to the animal or animals of the habitat concerned a topical formulation in sufficiently pesticidal quantities of a compound according to formula (I), or possibly formula (II), at monthly intervals.
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- Insecticidal combination to control mammal fleas, in particular fleas on cats and dogs
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Process and composition, in particular for controlling fleas on small mammals, characterized in that the composition includes, on the one hand, at least one insecticide of 1-N-arylpyrazole type, in particular fipronil, and, on the other hand, at least one compound of IGR (insect growth regulator) type, in doses and proportions which are parasiticidally effective on fleas, in a fluid vehicle which is acceptable for the animal and convenient for local application to the skin, preferably localized over a small surface area.
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- Synthesis of S-(+)-methoprene
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An optically active juvenile hormone analogue, S-(+)-methoprene (1), is synthesized in six steps from technical grade S-(+)-3,7-dimethyl-1,6-octadiene (''(+)-dihydromyrcene'', e.e. ca. 50percent) by a novel procedure which begins with selective hydroalumination-oxidation to give S-(-)-citronellol.This alcohol is oxidized to give S-(-)-citronellal which on reaction with allylmagnesium chloride affords 6S,10-dimethyl-1,9-undecadien-4R/S-ol (5).Smidt-Moiseev oxygenation of 5 followed by dehydration leads to 6S,10-dimethyl-3E,9-undecadien-2-one.The latter on treatment with isopropoxyethynylmagnesium bromide is transformed into isopropyl 3,7S,11-trimethyl-2E/Z,4E,10-dodecatrienoate which upon Brown solvomercuration-reduction in MeOH gives 1 in 14percent overall yield.
- Odinokov, V. N.,Ishmuratov, G. Yu.,Kharisov, R. Ya.,Serebryakov, E. P.,Tolstikov, G. A.
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- Macrocyclic plant acaricides
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Compounds of the formula I STR1 in which either R is methyl and there is a double bond in the 9,10-position, or in which R is hydrogen and there is a single bond in the 9,10-position, are highly active against Acarina which damage plants.
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- Dressing material having adsorbed thereon a solvent dilution microcarrier precursor solution
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A method for forming vehicles for encapsulating passenger molecules which have been named solvent dilution microcarriers (SDMCs), and the products of this process, are disclosed which allows for immediate or delayed formation of the encapsulating vehicles following creation of a shelf-stable formed solution by dissolution of amphipathic bilayer-forming materials, appropriate solvent, and the passenger molecule, addition of aqueous solution, and further addition of solvent. The SDMCs are organized from the formed solution by dilution into an aqueous system, aerosolization, or rehydration in situ. A dressing material is formed by adsorbing said shelf-stable formed solution onto said material.
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- TERPENES IN ORGANIC SYNTHESIS. 13. SYNTHESIS OF S-(+)-METHOPRENE FROM (+)-&β-CITRONELLENE
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S-(+)-Methoprene (I) was synthesized from (+)-β-citronellene (III) with an optical purity of about 50percent.The optical purity of the key intermediate, S-(-)-7-methoxy-3,7-dimethyl-1-octanol (IV), can be increased by fractional crystallization of the optical active acid phthalate salt (VI) followed by hydrolytic crystallization of the alcohol (IV).The yield of (I) at the final synthetic stage can be increased by use of interphase catalysis.S-(+)-Methoprene has a higher morphogenetic activity than the racemic form.
- Serebryakov, E. P.,Zhdankina, G. M.,Kryshtal', G. V.,Mavrov, M. V.,Khao, Nguen Kong
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p. 739 - 743
(2007/10/02)
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- OZONOLYSIS OF ALKENES AND THE REACTION OF POLYFUNCTIONAL COMPOUNDS. XXXVIII. SYNTHESIS OF ISOPROPYL 3,7,11-TRIMETHYL-11-METHOXY-2E-DODECADIENOATE
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Isopropyl 3,7,11-trimethyl-11-methoxy-2ξ-dodecenoate was obtained by the ozonolysis of 1,5-dimethyl-1-cyclo-octene followed by transformations of the 4-methyl-1,1-dimethoxy-8-oxononane, including ethoxycarbonylmethylenation at the keto group, reaction of the aldehyde group with isopropylidenetriphenylphosphorane, and methoxylation.Allylic bromination of the product, followed by dehydrobromination, gave isopropyl 3,7,11-trimethyl-11-methoxy-2,4-dodecadienoate in the form of a mixture (82:18) of the 2E,4E- and 2Z,4E-isomers (yield calculated on the initial cyclooctene 15percent).The individual 2E,4E-isomer was isolated by preparative high-performance chromatography.
- Odinokov, V. N.,Kukovinets, O. S.,Zainullin, R. A.,Tolstikov, G. A.
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p. 650 - 653
(2007/10/02)
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- Nitro- and cyanoguanidines as selective preemergence herbicides and plant defoliants
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There are provided novel nitroguanidine and cyanoguanidine compounds. A method of dessicating and defoliating plants by applying to the foliage thereof certain nitroguanidine or cyanoguanidine compounds and a method for the selective preemergence control of undesirable broadleaf weeds and grasses in the presence of graminaceous crops are disclosed.
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- SYNTHESIS OF ALKENOIC ACID DERIVATIVES CONTAINING CYCLOPROPANE RING, NEW JUVENILE HORMONE ANALOGS
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A synthetic method is described for the preparation of new type juvenoids .
- Baan, Gabor,Vinczer, Peter,Novak, Lajos,Szantay, Csaba
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p. 4261 - 4264
(2007/10/02)
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- Stereocontrolled Synthesis of the Insect Growth Regulators - Alkyl (2E,4E)-Dodecadienoates
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The title compounds 1 and 16 were synthesized by condensation of the dianions of β-keto esters 5 and 11 with aldehydes 4, and lithium dialkylcuprate addition to the enol acetate or enol phosphate of unsaturated β-keto esters 8 and 15.The (2E,4E)-dodecadienoate derivatives 1 and 16 were formed in a stereoselective manner.
- Novak, Lajos,Rohaly, Janos,Kolonits, Pal,Fekete, Jenoe,Varjas, Laszlo,Szantay, Csaba
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p. 1173 - 1182
(2007/10/02)
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