نتایج جستجو برای: anhydrides

تعداد نتایج: 2251  

2012
Colin N. Kelly Sarah M. Sulon Lam N. Pham Kang Rui Xiang Richard E. Sykora David C. Forbes

In the title compound, C23H38O5, the oxabicyclo-[2.2.1]heptane-2,3-dicarb-oxy-lic anhydride unit has a normal geometry and the tetra-decoxymethyl side chain is fully extended. In the crystal, mol-ecules are linked head-to-head by C-H⋯O hydrogen bonds, forming two-dimensional networks propagating along the a and c-axis directions.

2016
Yang Kang Rui Jin Qiang Wu Mingyu Song Jixiang Cheng Pengfei Yu

The present engineering practices show the potential that epoxy asphalt composites (EACs) would be a better choice to obtain long life for busy roads. To understand the service performance–related thermorheological properties of prepared bimodal anhydrides-cured rubber-like EACs (REACs), a direct tensile tester, dynamic shear rheometer and mathematical model were used. Tensile tests demonstrate...

Journal: :Journal of molecular modeling 2015
A Ben Fredj G M Day

Lattice energy calculations using a model potential were performed to model the crystal structures of cis-1,2,3,6- and 3,4,5,6-tetrahydrophthalic (THP) anhydrides. The optimized molecular models using the DFT method at the B3LYP/6-31G** level were found consistent with the available experimental evidence and allowed all differences observed in crystal packing between cis-1,2,3,6- and 3,4,5,6-TH...

Journal: :The European respiratory journal 2000
R D Barker M J van Tongeren J M Harris K Gardiner K M Venables A J Newman Taylor

Risk factors for bronchial hyperresponsiveness have previously been established in the general community. In settings where occupational asthma is a risk, it has not been established whether occupational sensitization or measures of exposure are important. Bronchial responsiveness to histamine was measured in a cohort of 506 workers exposed to acid anhydrides. Skin-prick tests were performed wi...

Journal: :Journal of the American Chemical Society 2006
Anne J McNeil Peter Müller James E Whitten Timothy M Swager

A series of poly(p-arylene butadiynylene)s containing zero, one, and two co-facial pi-pi interactions per repeat unit were synthesized and characterized. A surprisingly selective and high-yielding Diels-Alder cycloaddition of anthracene and nonsymmetric, sterically hindered anhydrides proved essential to generating the cofacial arene-containing monomers. Single-crystal X-ray structures display ...

Journal: :Synthesis 2022

Abstract A scalable synthetic route to both primary arylphosphines ArPH2 and aryldichlorophosphines ArPCl2 is reported. The C–P bond formation was performed in a highly regiospecific manner through electrophilic substitution of selected aromatic hydrocarbons (ArH) with phosphorus pentasulfide. resultant perthiophosphonic anhydrides Ar2P2S4 were then reacted LiAlH4 give phosphines ArPH2. Subsequ...

Journal: :Bioconjugate Chemistry 2021

Cyclic anhydrides are potent tools for bioconjugation; therefore, they broadly used in the functionalization of biomolecules and carriers. The pH-dependent stability reactivity, as well physical properties, can be tuned by structure cyclic anhydride used; thus, their application smart delivery systems has become very important. This review intends to cover last updates use pH-sensitive linkers,...

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