• Keine Ergebnisse gefunden

On the Reaction of Cyanamides with N-Alkylnitrilium and N,N-Dialkylcyanamidium Salts

N/A
N/A
Protected

Academic year: 2022

Aktie "On the Reaction of Cyanamides with N-Alkylnitrilium and N,N-Dialkylcyanamidium Salts"

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Volltext

(1)

On the Reaction of Cyanamides with N-Alkylnitrilium and N,N-Dialkylcyanamidium Salts

Rajab Abu-El-Halawa

Department of Chemistry, Al al-Bayt University, Mafraq 25113, Jordan Reprint requests to Prof. R. Abu-El-Halawa. E-mail: halawarajab@yahoo.com Z. Naturforsch.2009,64b,297 – 306; received October 27, 2008

Dedicated to Professor Johannes C. Jochims on the occasion of his 75thbirthday

N-Alkylnitrilium and N,N-dialkylcyanamidium salts 1 and 2 undergo ene reactions with cyanamides4to afford 2-azoniaallene salts7and9in which theN-alkylnitrilium salts1react as the ene, and the cyanamides4react as the enophile components. Competing with the ene reaction, N-alkylnitrilium salts1undergo [2++2+2] cycloaddition to furnish triazinium salts8. 2-Azoniaallene salts react with alcohols to afford alkoxy amino derivatives10and12, which yield iminium salts11 and ketals/acetals upon further reaction with alcohols. The constitution of the 2-azoniaallene7and9 and triazinium salts8was secured by elemental analyses and spectral properties (IR and NMR).

Key words:Ene Reaction, [2++2+2]-Cycloaddition, Nitrilium, Cyanamidium, 2-Azoniallene, Triazinium

Referenzen

ÄHNLICHE DOKUMENTE

Arenediazonium salts having various electron-donating and electron- withdrawing groups preceded smoothly and afforded the corresponding borylation products in moderate to good

Kantlehner and coworkers (Stuttgart/Aalen) give an account of their studies on the reaction of N, N, N , N - tetramethyl-chloroformamidinium chloride with sodium,

b Institut f¨ur Anorganische Chemie der Universit¨at T¨ubingen, Auf der Morgenstelle 18, 72076 T¨ubingen, Germany.. Reprint requests

Interestingly, the “ter- minal” barbituric ring also adopts a diketo structure which underlines the C-basicity of the enolate frag- ment.. We will continue our investigations

N-Alkylnitrilium and N-alkylcyanamidium salts 1 and 2 undergo ene reactions with electron- rich cyanamides to afford 2-azoniaallene salts 9 and 7, respectively, in which the

The N-alkyloxy groups are twisted out of the imidazole ring plane and adopt either syn or anti conformations in the solid state. Key words: Carbene, Imidazolium Salt, Ionic Liquid,

Fig. The molecular structure of the cationic nickel- carbene complex 13 showing part of the atom numbering scheme. Displacement ellipsoids are drawn at the 50 % prob- ability

Interaction of β -thiocyanatovinyl aldehydes with N-amino heterocycles leads to formation of α ,β - unsaturated hydrazonium salts dependent on the functional surroundings.. The