Reactions of some aromatic nitro compounds with alkali metal amides

Gandhi, Sham S.; Gibson, M. S.; Kaldas, M.; Vines, S. Martin

doi:10.1021/jo00393a052

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…The molecular weight distribution of the oligomers formed as a function of NCO conversion can be modeled. A projection of the influence of a change in reactivity on X w is shown for one of the monomers in Figure , where the stoichiometric imbalance parameter r (defined as less than 1 in the theoretical treatment of size distribution) was set equal to 0.81 . The effect of the reactivity ratio K is most dramatic at conversion greater than 0.4.…”

Section: Resultsmentioning

confidence: 99%

A Spectroscopic Analysis of the Phase Evolution in Polyurethane Foams

Heintz¹,

Duffy²,

Nelson³

et al. 2005

Macromolecules

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Infrared spectroscopy has been used to study the evolution of polyurethane foam structure, providing measures of relative reaction kinetics, hard segment growth, the onset of phase separation, the formation of order, and the development of final morphology. Changes in free, monodentate, and bidentate hydrogen-bonded urea groups dominate the organization of the entire ensemble. Hard segments formed by reaction of 2,6-toluene diisocyanate (2,6-TDI) and by a mixture of 80% 2,4-TDI and 20% 2,6-TDI displayed very different local segmental alignment, a factor crucial in the development of morphology. Phase separation occurred faster, with fewer and shorter hard segments, in the systems with well-ordered straight chains. The formation and time evolution of monodentate ureas suggest that phase development may be incomplete, or trapped, in systems with ill-defined urea structures. A low degree of spatial order exists in the systems containing these structures.

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Section: Resultsmentioning

confidence: 99%

A Spectroscopic Analysis of the Phase Evolution in Polyurethane Foams

Heintz¹,

Duffy²,

Nelson³

et al. 2005

Macromolecules

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“…ONSH aminations on electron-poor nitroarene derivatives have been studied for decades. , The Beier group recently employed the addition of superstoichiometric lithium anilides to nitro(hetero)arenes at deeply cryogenic temperatures (below −100 °C), followed by quenching with potassium permanganate in liquid ammonia (Scheme B) …”

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confidence: 99%