Define Orthoceras. Orthoceras synonyms, Orthoceras pronunciation, Orthoceras translation, English dictionary definition of Orthoceras. n. 1. An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into n
Preferred reaction inert solvents include, for example, acetone, benzene, toluene, xylene, o-dichlorobenzene, nitrobenzene, nitromethane, pyridine, dichloromethane, dichloroethane, tetrahydrofuran, dimethylformamide (DMF), dimethylacetamide (DMA), dioxane, dimethylsulfoxide (DMSO), acetonitrile, sulfolane, N-...
A dry toluene or xylene (12.5 mi) solution of the amide 6 (10 mmol) was treated dropwise with POCl3 (20-50 mmol) under nitrogen at rt. The reaction was stirred at rt for 16 hours (alternatively, the POCl3 reaction was warmed to reflux for 3-5 hours) and then the solvents were care...
optionally substituted 5- or 6-membered non-aromatic heterocyclic group as An example of G as a ring is shown in Exhibit 2. Note that when the point of attachment to the G group is shown to be fluid, the G group
Anorthotomiccurve is the set of reflections of a given point O with respect to all the tangents of a given curve not passing through O. Then theorthotomiccurve of [x(s), y(s)] relative P has a cusp at s = [s.sub.0], if and only if [x(s), y(s)] has an infection point...
Phthalic anhydride of commercially acceptable quality can be recovered from the neat oxidation of liquid o-xylene with air in the presence of the catalysis system provided by cobalt, manganese and bromine conducted in a single step and in the presence of a small amount of benzoic acid to make ...