Question

amidenes resonatic strecture ​

Answer 1

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Amidines are organic compounds with the functional group RC(NR)NR2, where the R groups can be the same or different. They are the imine derivatives of amides (RC(O)NR2). The simplest amidine is formamidine, HC(=NH)NH2.

Preparation

A common route to primary amidines is the Pinner reaction. Reaction of the nitrile with alcohol in the presence of acid gives an iminoether. Treatment of the resulting compound with ammonia then completes the conversion to the amidine.Instead of using a Bronsted acid, Lewis acids such as aluminium trichloride promote the direct amination of nitriles. They are also generated by amination of an imidoyl chloride.They are also prepared by the addition of organolithium reagents to diimines, followed by protonation or alkylation.

Dimethylformamide acetal reacts with primary amines to give amidines:

Me2NC(H)(OMe)2 + RNH2 → Me2NC(O)NHR + 2 MeOH

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Answer 2

╚»★«╝ THE Amidenes RESONATING STRUCTURE:- ╚»★«╝

==>The resonance structures of aniline are due to the involvement of lone pairs of electrons on nitrogen. In three resonance structures of aniline, the Nitrogen atom in amine group has a positive charge and one of the Carbon atoms in the ring (ortho or para to amine group in aniline) contains a negative charge.

==>Resonance. Amides are the most unreactive of all carboxylic acid derivatives. This is because of its slight double bond characteristic that reduces the leaving group ability of the nitrogen. This resonance form is more prevalent among amides than it is for carboxylic acids, esters, or anhydrides.