Jackson group

Warwick, P.D., Crowley, S.S., Ruppert, L.F. and Pontolillo, J. (1997) Petrography and geochemistry of selected lignite beds in the Gibbons Creek mine (Manning Formation, Jackson Group, Paleocene) of east-central Texas. International Journal of Coal Geology, 34(3-4), 307-26. 

Sabine Uplift (semi-circular outcrop area next to Louisiana), where tabular and thicker seams (0.9 to 3.6 m. thick) are present. The poorest grade lignite occurs in the Jackson Group. Seams are numerous and range from 0.6 to 3.6 m. thick with many less than 1.5 m. thick. Thicker seams are commonly 1.2 to 2.4 m. thick, tabular, and laterally continuous for up to 48.3 km. (30 miles). 

Tuff and tuffaceous sandstone in the Jackson Group of Eocene age (151,152)... 

A vanadium-catalyzed enantioselective sulfoxidation using related Schiff-base ligands was later developed by the Jackson group. In this reaction, selective oxidation... 

A mild procedure which does not involve strong adds, has to be used in the synthesis of pure isomers of unsymmetrically substituted porphyrins from dipyrromethanes. The best procedure having been applied, e.g. in unequivocal syntheses of uroporphyrins II, III, and IV (see p. 251f.), is the condensation of 5,5 -diformyldipyrromethanes with 5,5 -unsubstituted dipyrromethanes in a very dilute solution of hydriodic add in acetic acid (A.H. Jackson, 1973). The electron-withdrawing formyl groups disfavor protonation of the pyrrole and therefore isomerization. The porphodimethene that is formed during short reaction times isomerizes only very slowly, since the pyrrole units are part of a dipyrromethene chromophore (see below). Furthermore, it can be oxidized immediately after its synthesis to give stable porphyrins. 

A. R. Haygarth-Jackson, Serials 85. Proceedings of the U. K Serials Group Conference, 29—47 (1985). 

Burdick Jackson Daicel Chemical Industries (Japan) Harcros Chemicals ICl Group (UK)... 

The coupling reaction of 3-methylindole (Scheme 12-21) is complex, as it involves an initial ipso-addition at the 3-position followed by rearrangement of the arylazo group to the 2-position (Jackson and Lynch, 1987 Jackson et al., 1987). However, under slightly different conditions Spande and Glenner (1973) isolated the unusual triazene 12.41. Based on the change in the UV spectrum of the reaction mixture with time, Sarma and Barooah (1977) proposed a mechanism involving initial formation... 

Similar results were found in a study of aromatic carboxylates with one to six carboxyl groups (Scott, Jackson Wilson, 1990). Adsorption increased with the number of carboxyl groups and was also dependent on the spacing between the carboxyl groups. With the benzene dicarboxylates, maximum permanent adsorption was obtained with the 1,3-dicarboxylate, while the 1,4-dicarboxylates was not adsorbed at all. This is again evidence of the cooperative effect between carboxyl groups. 

Jackson and Robertson consider the molecular structure characterisation and analysis of polymer end groups in Chapter 5. 

Schultz and coworkers (Jackson et a ., 1988) have generated an antibody which exhibits behaviour similar to the enzyme chorismate mutase. The enzyme catalyses the conversion of chorismate [49] to prephenate [50] as part of the shikimate pathway for the biosynthesis of aromatic amino acids in plants and micro-organisms (Haslam, 1974 Dixon and Webb, 1979). It is unusual for an enzyme in that it does not seem to employ acid-base chemistry, nucleophilic or electrophilic catalysis, metal ions, or redox chemistry. Rather, it binds the substrate and forces it into the appropriate conformation for reaction and stabilizes the transition state, without using distinct catalytic groups. 

AE Jackson, RAW Johnstone. Rapid, selective removal of benzyloxycarbonyl groups from peptides by catalytic transfer hydrogenation. Synthesis 685, 1976. 

At values of a Froude group of less than unity, particulate fluidisation normally occurs and, at higher values, aggregative fluidisation takes place. Much lower values of the Froude number are encountered with liquids because the minimum velocity required to produce fluidisation is less. A theoretical justification for using the Froude group as a means of distinguishing between particulate and aggregative fluidisation has been provided by Jackson and Murray . 

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