This pyridine to which reference has just been made has lately been brought forward as a remedy for asthma.
And Professor See, the eminent French physician, believes that the pyridine is the relieving agent.
A complex, oily, nitrogenous base, isomeric with nicotine, and obtained by the reduction of certain derivatives of the pyridine group.
N, of the pyridine group, found in coal tar; also, any one of the series of isometric substances of which it is the type.
Methyl " 2 " Pyridine Bases 1/2 " In addition to these two general formulas for de-natured alcohol a number of special formulas have been authorized to be used in the manufacture of certain classes of goods.
Methyl " 3 " Pyridine Bases 1/2 " The next formula may be used for the following purposes: In the manufacture of photographic dry plates.
The salts of pyridine were shown by McKendrick and Dewar to act as febrifuges in 1881, but they have not hitherto found their way into pharmacy.
In 1881 there was introduced into medicine the first of a group of antipyretics derived from coal-tar bases of the pyridine series.
The three hydrocarbons are comparable with the three bases, which may be regarded as derived from them in the same manner that pyridine is derived from benzene-- Benzene .
Thus in coal-tar, in addition to pyridine, there is another base known as quinoline, which is related to pyridine in the same way that naphthalene is related to benzene.
The aldo-ketenes are colourless compounds which are not capable of autoxidation, are polymerized by pyridine or quinoline, and are inert towards compounds containing the groupings C:N and C:O.
Those in which the keto groups are in combination with phenyl residues give pyridine derivatives on treatment with hydroxylamine, thus benzamarone, C6H5CH[CH(C6H5).
An oil obtained by distillation of peat, and containing various members of the pyridine series.
This view has been fairly well supported by later discoveries; but, in addition to pyridineand quinoline nuclei, alkaloids derived from isoquinoline are known.
Konigs, expressed the opinion that the alkaloids were derivatives of pyridine or quinoline.
In practice, the crude anthracene is purified by solution in the higher pyridine bases, after which treatment it is frequently sublimed.
The crude anthracene cake is purified by treatment with the higher pyridine bases, the operation being carried out in large steam-jacketed boilers.
The crystallized anthracene is then removed by a centrifugal separator and the process of solution in the pyridine bases is repeated.
It gives a precipitate with iodine trichloride, and has therefore probably a pyridine nucleus, it may be an acid anilide.
On distilling with zinc dust phenanthrene, pyridine, pyrrol, trimethylamine, and ammonia are formed; evidence of a pyridine nucleus.
It crystallises frompyridine in prismatic needles melting above 360° C.
In pyridine solution the carboxyl group maybe eliminated by hydrogen iodide, whereby pentoxybiphenylmethylolide is formed as long silky needles, which do not melt below 300° C.
CH3)2, of the pyridine series, obtained from bone oil as liquids, and having peculiar pungent odors.
Defn: A complex, oily, nitrogenous base, isomeric with nicotine, and obtained by the reduction of certain derivatives of the pyridine group.
Most of these are of a basic character, and belong to thepyridine and the quinoline series.
This reagent is added until the acid reaction has just disappeared and a faint smell of pyridine is perceived.
Tobacco smoke, contrary to popular belief, does not contain nicotine, which is decomposed by the heat; but pyridine and its homologues and the beneficial effects of tobacco in many cases of asthma must be attributed to this latter.
One of the decomposition products of nicotine is Pyridine Pyridine is usually found in tobacco smoke.
Both nicotine and its derivative pyridine as well as the tarry oils resulting from tobacco distillation are strong and effective disinfectants; and formaldehyde, one of the most powerful germicides known, is so formed.
Reference will be made later on to the effects of nicotine and pyridine on the human system.
Pyridine is only one-twentieth as toxic as nicotine.
Pyridine was, however, found in the smoke of all tobacco burned.
Moreover, some of the investigators who have done very careful work do not consider that nicotine is the toxic element, but the substance called pyridine which is derived from it.
Bush concluded, therefore, that pyridine and not nicotine is the toxic factor in tobacco smoke.
Conine, on oxidation, yields chiefly butyric acid, but among the products of oxidation has been found the pyridine carboxylic acid before referred to.
As already stated, both series occur in coal-tar and the pyridine series also more abundantly in bone-oil.
When cinchonine is distilled with solid potassium hydrate, it yields pyrrol and bases of both the pyridine and quinoline series.
This is not exactly the case with the higher groups of alkaloids--the derivatives of pyridine and quinoline.
Ladenburg succeeded in so hydrogenizing pyridine by acting upon an alcoholic solution with sodium, and from the base which was formed he obtained a platinochloride which agreed with the similar double salt of piperidine.
We may take piperidine and coniine as examples of the methods followed in alkaloidal synthesis; these arepyridine bases.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "pyridine" in a variety of sentences. We hope that you will now be able to make sentences using this word.
