Thermal decomposition of aluminum alkoxides

BRIEGER, G.; Watson, Stephen; Barar, Donald G.; Shene, Anita L.

doi:10.1021/jo01322a032

Cited by 15 publications

(14 citation statements)

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“…Initially, diol 7 was dehydrated to the corresponding bis(vinyl) derivative 8 by treatment with Al(OiPr) 3 at 300 8C. [24] The subsequent addition of bromine to the vinyl groups was expected to provide a suitable precursor which, upon dehydrobromination, would yield the desired acetylene. However, only unreacted starting material was recovered from the reaction of 8 with bromine, even in the presence of Lewis acids (Scheme 1).…”

Section: Resultsmentioning

confidence: 99%

Camouflaged Carborarods Derived from B‐Permethyl‐1,12‐diethynyl‐para‐ and B‐Octamethyl‐1,7‐diethylnyl‐meta‐carborane Modules

Herzog¹,

Jalisatgi²,

Knobler³

et al. 2005

Chemistry A European J

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Rigid camouflaged carborarods constructed from the corresponding C,C'-diethynyl derivatives of B-decamethyl-1,12-dicarbadodecaborane(12) (6) and B-octamethyl-1,7-dicarbadodecaborane(12) (48) have been synthesized by largely conventional organic transformations. These carborarods are the longest discrete rod species available by this method in which B-methylated p-carborane and m-carborane cages are linked through their carbon vertices by using butadiynylene moieties. They exhibit enhanced solubility in common organic solvents relative to all other presently known carborane-based rigid-rod molecules. The oxidative coupling of bis(ethynyl) derivatives of 6 generates oligomers containing, on average, 16 carborane modules. The structural characterization of the corresponding dimeric species revealed that the carborarods possess a sinusoidal chain distortion in the solid state. The stereoelectronic properties of these and related model carborarods were evaluated by using molecular dimensions as a monitor for the comparison of computational and experimental methods. In addition, the effect of exhaustive B-methylation of 12- and 10-vertex para-carborane cages in a series of model C,C'-diethynyl derivatives was similarly investigated by computational and structural studies. As expected, a correlation of intercage C--C bond lengths with cage size was observed and was attributed to hybridization effects. B-Permethylation had no significant structural effect with either 10- or 12-vertex cage derivatives. Relative to unsubstituted compounds, thermal and chemical stabilities of B-permethylated derivatives were increased through the operation of a steric "bumper-car" process, and solubilities in organic solvents were enhanced. The formation of linear, sterically encumbered platina-carborarods using ethynyl derivatives of 6 as precursors is described.

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Section: Resultsmentioning

confidence: 99%

Camouflaged Carborarods Derived from B‐Permethyl‐1,12‐diethynyl‐para‐ and B‐Octamethyl‐1,7‐diethylnyl‐meta‐carborane Modules

Herzog¹,

Jalisatgi²,

Knobler³

et al. 2005

Chemistry A European J

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“…We synthesized EBF by farnesol dehydration (Brieger et al, 1979). We synthesized EBF by farnesol dehydration (Brieger et al, 1979).…”

Section: Methodsmentioning

confidence: 99%

“…Chemical treatments. We synthesized EBF by farnesol dehydration (Brieger et al, 1979). Because of the challenge in isomeric purification, a silica gel column-purified mixture of 6 farne-Sene isomers containing 32% EBF was tested for behavioral activity in an initial experiment along with un-, do-, and heptadecanoic acids, ca.…”

Section: Methodsmentioning

confidence: 99%

POST‐LANDING BEHAVIOR OF ALATE MYZUS PERSICAE AS ALTERED BY (E)‐β‐FARNESENE AND THREE CARBOXYLIC ACIDS

Phelan

Miller

1982

Entomologia Exp Applicata

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The potential of 4 chemicals for disrupting the host-selection behavior of the aphid, Myzus persicae, was investigated using a flight chamber with both vertical and horizontal wind flow. (E)-13-farnesene (the aphid alarm pheromone) reduced probe durations, increased wandering, but did not reduce eventual settling. Undecanoic and dodecanoic acids (but not heptadecanoic acid) reduced all host-selection behaviors. Even after multiple landings, aphids never settled on surfaces treated with un-and dodecanoic acids. These laboratory data do not support the prospect that these chemicals would reduce non-persistent virus spread since aphids virtually always probed immediately after landing on any treatment. Other potential uses of these chemicals for aphid control are discussed.Ktv WORDS: Myzus persicae m Aphid alarm pheromone --(E)-l~-farnesene --Aphid repellents-Vertical flight tunnel.

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“…The elimination reactions of menthol 9 and its derivatives have received extensive study. 14 Some of those results are presented in Table 3. It should be noted that our results with both catalysts are clearly different.…”

Section: Resultsmentioning

confidence: 99%