Does pyridine phenanthrene, etc., also belong to ene ?

It does not belong to the alkene. Let's start with that.

Although the double bonds of these compounds are conjugated.

But it's not like the previous ones said.

Just because of the conjugation, the bond is changed, it is not an alkene.

For example, butadiene, although the bonding properties are also changed due to conjugation.

But it still belongs to the alkene.

Because it still has the chemical properties of alkene.

When we decide whether a substance belongs to a certain class or not.

The key is to see if it has the properties common to this class of compounds.

If the nature is significantly different.

It can't be put into one category.

The compounds you are talking about are all aromatic compounds.

Although there are double bonds of alkene on the surface.

But due to the closed-shell structure of aromatic compounds.

As a result, it does not have the properties of alkenes (such as it is not easy to be added).

Therefore, none of them can be considered alkenes.

Pyridine is a six-membered heterocyclic compound containing one nitrogen heteroatom. Molecular formula C5H5N. That is, one of the benzene molecules is a compound formed by nitrogen substitution, so it is also called nitrogen benzene.

Phenanthrene is a fused cyclic aromatic hydrocarbon, isomer of anthracene, the chemical bond in the pyridine and phenanthrene molecule is not a carbon double bond, but a special chemical bond between the double bond and the single bond, which does not belong to the alkene.

Olefines belong to hydrocarbons and can only have two elements, ch. Pyridine is a six-membered heterocyclic compound containing one nitrogen heteroatom. Molecular formula C5H5N. More n

A hydrocarbon with a carbon-carbon double bond is an alkene. The chemical bond in the phenanthrene molecule is not a carbon-carbon double bond but a large Pa bond.

the reaction between benzenesulfonic acid and pyridine.

What is pyridine mesolene? There is no such thing as a chemical macro and hidden product in this Bird Hall!

The meaning of this sentence is: toxic substance, is the meaning of living beings. For example: some kind of virus, insect eggs, etc.

Yes, and it should be frozen, refrigeration is not possible, 4 vinylpyridine is very easy to self-polymerize, if it is found to become viscous, then it cannot be used.

Packing method:

Ordinary wooden box outside ampoules; Ordinary wooden boxes outside screw-mouth glass bottles, iron-capped glass bottles, plastic bottles or metal barrels (cans); Screw-mouth glass bottles, plastic bottles or tinned thin steel plate barrels (cans) are filled with bottom lattice boxes, fiberboard boxes or plywood boxes.

It can form an azeotropic mixture with water, and the content of this product has an azeotropic point of 98. It is easy to polymerize by light and heat, and a polymerization inhibitor (hydroquinone) should be added during storage.

4-vinylpyridine is prone to polymerization when exposed to light or heat, so in general, the newly purchased ones contain a certain amount of polymerization inhibitors. As soon as it is resteamed, the color will disappear. If you can't use it immediately, be sure to keep it sealed and stored at low temperature.

Since your substrate is formyl hydrazide, it is much less alkaline. It is recommended to heat and reflux and use an acid stronger than acetic acid, such as p-methylbenzenesulfonic acid, as a catalyst.