INDEX unsubstituted derivatives

Organic derivatives of phosphine react very vigorously with halogens Individually indexed (unsubstituted) phosphines are ... 

Only unsubstituted boranes and their complexes are grouped here, alkylated or halogenated derivatives are have their own entries Individually indexed compounds are ... 

The dibenzylbutyrolactone lignan matairesinol was also found to be an anti-HIV agent [110], although the sample used in this bioassay was not isolated from a Taxus species. Another dibenzylbutyrolactone lignan, arctigenin, as well as its unsubstituted benzyl derivative exhibited anti-HIV replication activity, with EC50 values of 0.16 and 22 ig/mL and therapeutic index values of 5 and 9.1, respectively [111]. 

At the changeover from the eighth to the ninth Collective Index periods (1972), the use of many older stem names was discontinued. These are all found in the older literature, and some can still be found in the literature today. The list in Table 3.3 equates many 9CI name fragments with those used in the SCI and earlier. An asterisk indicates that the name was used in SCI for the unsubstituted substance only substituted derivatives were indexed elsewhere. 

The IR spectrum of the unsubstituted cydopropenylium ion exhibits only four bands at 3105, 1276, 908 and 736 cm , as expected from the Djij-symmetry. The band at 1276 cm is due to an E ring deformation vibration of the central three-membered ring, which is generally observed as a strong band in the range of 1400 to 1490 cm for the aryl- and alkyl-substituted derivatives (Table 2). The frequency of this band for the trimethyl-, tri-zc-rt-butyl, triphcnyl, and unsubstituted cydopropenylium ions exhibits a linear correlation with the index of the cation s thermodynamic stability such as For heteroatom-substituted derivatives... 

Applications of these C-H activation processes in polymerization reactions have also been reported in the literature. For example, a palladium-catalyzed C-H arylation polycondensation was carried out between a thiophene unsubstituted at the 2- and 5- positions and its 2,5-dibromo derivative. The transformation was effected in the presence of palladium acetate, a phosphine, and cesium carbonate in DMF at 100 °C for 48 h (eq 23). A survey of different phosphines showed that similar yields, molecular weights (Mn), and polydispersity indexes (PDI) could be obtained using di-tert-butyl(methyl)phosphonium tetrafluoroborate or tri-cyclohexylphosphonium tetrafluoroborate as the ligand. ... 

From the Table 2, it is clear that the unsubstituted mesoionic compounds (Compounds 1 and 7) are more reactive than their substituted derivatives. Global electrophilicity indexes of the instant molecules run hand-in-hand with their activities. From, the global reactivity parameters, it can be concluded that unsubstituted mesoionic compound containing oxygen atom at position 3 (Compound 7) is more reactive as compared to the unsubstituted mesoionic compound containing sulphur atom at position 3 (Compound 1). From the computed global DFT based reactivity parameters, the overall reactivity order of mesoionic compounds are nicely observed. 

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