- Synthesis and transformations of metallacycles 46. Catalytic cycloalumination reaction in the synthesis of bis(phospholanes)
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An efficient one-pot synthesis of bis(phospholanes) was elaborated, which included a sequential Cp2ZrCl2-catalyzed cycloalumination of α,ω-diolefins with AlEt3, giving the corresponding bis(aluminacyclopentanes), and their in situ reaction with dihalophosphines to furnish the target α,ω-bis(phospholanes). The reaction of these compounds with H2O2 or elementary sulfur gave the corresponding bis(phospholane 1-oxides) and bis(phospholane 1-sulfides).
- D’yakonov,Makhamatkhanova,Agliullina,Tyumkina,Dzhemilev
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p. 2493 - 2497
(2016/09/28)
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- New syntheses of 1,7-dimethylnonyl propanoate, the western corn rootworm pheromone, in four different ways via cross metathesis, alkylation and coupling reactionsss
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A mixture of the four stereoisomers of 1,7-dimethylnonyl propanoate, the female sex pheromone of the western corn rootworm (Diabrotica virgifera virgifera LeConte), was synthesized in four different ways by employing one of the following four reactions as the key step: (i) cross metathesis using the Grubbs I catalyst, (ii) cross metathesis using the Grubbs II catalyst, (iii) alkylation of an alkynide anion, and (iv) Grignard coupling in the presence of dilithium tetrachlorocuprate. Although the cross metathesis approaches enabled two short syntheses (4 or 6 steps) of the pheromone to be achieved, the cheapest and most efficient synthesis was possible via Grignard coupling to give the desired pheromone in a 40% overall yield based on 2-methyl-1-butanol (8 steps).
- Mori, Kenji
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scheme or table
p. 595 - 600
(2011/04/23)
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- Cyclization of methyl-substituted 6-heptenyl radicals
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(Matrix presented) The behavior of a series of methyl-substituted 6-heptenyl radicals, generated from the corresponding iodides ((Me3Si)3SiH, AIBN in benzene at 80°C), has been investigated. The stereoselectivity of the 6-exo cyclizations, affording dimethylcyclohexanes, is low, and sizable quantities of methylcycloheptane, generated via 7-endo cyclization, are also produced.
- Bailey, William F.,Longstaff, Sarah C.
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p. 2217 - 2219
(2007/10/03)
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- SYNTHETIC INVESTIGATIONS INTO INSECT-ATTRACTING SUBSTANCES (SEX ATTRACTANTS). IV. SYNTHESIS OF 14-METHYL-8-cis-HEXADECENAL AND 14-METHYL-8-trans-HEXADECENAL, COMPONENTS OF THE SEX PHEROMONE OF THE DERMESTID BEETLE Trogoderma granarium EVERTS
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14-Methyl-8-hexadecyn-1-ol was obtained by the alkylation of 7-methyl-1-nonyne with heptamethylene chlorohydrin.Its hydrogenation in the presence of colloidal nickel catalyst was used for the synthesis of 14-methyl-8-cis-hexadecen-1-ol, and reduction with lithium aluminum hydride was used for the synthesis of 14-methyl-8-trans-hexadecen-1-ol.Both ethylenic alcohols were converted by oxidation into the corresponding aldehydes, which are the main components of the sex pheromone of the dermestid beetle.
- Kovalev, B. G.,Rastegaeva, V. M.
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