J. Polym. Sci. A Polym. Chem.
 2000
DOI: 10.1002/(sici)1099-0518(20000515)38:10<1705::aid-pola10>3.0.co;2-9
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Virgil Percec1,
David A. Tirrell2
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“…[ 58,59 ] PPA is known to exist as 4 helical stereoisomers, which during thermal cis ‐ trans isomerization undergo an intramolecular electrocyclization. [ 60–65 ] For some of these, PPA Theato prepared both their cis ‐transoidal and trans ‐transoidal stereoisomers. Apparently, they were not aware that trans ‐transoidal PPA does not exist since during the cis ‐ trans isomerization, an intramolecular electrocyclization accompanied by chain cleavage occurs.…”
Section: Polymers Containing Double Bonds In the Main Chain And Penta...mentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…[ 58,59 ] PPA is known to exist as 4 helical stereoisomers, which during thermal cis ‐ trans isomerization undergo an intramolecular electrocyclization. [ 60–65 ] For some of these, PPA Theato prepared both their cis ‐transoidal and trans ‐transoidal stereoisomers. Apparently, they were not aware that trans ‐transoidal PPA does not exist since during the cis ‐ trans isomerization, an intramolecular electrocyclization accompanied by chain cleavage occurs.…”
Section: Polymers Containing Double Bonds In the Main Chain And Penta...mentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…This merit allows a full characterization of the main-chain conformation by various techniques. On the basis of 1 H NMR spectroscopy, Percec and coworkers developed a versatile method for the determination of the cis-content of poly(phenylacetylene) in the late 1970s, [30][31][32] which was later generalized for MSPAs containing functional side-chains. [5] In addition, 13 C NMR spectroscopy also helps to distinguish the stereoisomers.…”
Section: Stereostructural Conformers Of Mspamentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…The stereochemistry of the transition state of the coupling reaction determines the primary structure of the polymer [13,17]. If bulky substituents (Ph) are involved, a trans dominated polymer backbone is generated which is more dif®cult to degradate.…”
Section: Oligo-and Polymerizationmentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
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