Orthoamide und Iminiumsalze, CIII. Synthese von N,N′,N′′-peralkylierten Guanidiniumsalz-basierten ionischen Flüssigkeiten durch Anionenmetathese

N,N′,N′′-peralkylated guanidinium chlorides and N,N′,N′′-peralkylated guanidines were prepared from N,N′-peralkylated chloroformamidinium chlorides. The alkylation of the guanidines affords N,N′,N′′-persubstituted guanidinium chlorides bromides, iodides, alkylsulfates, and tetrafluoroborates. Guanidinium tricyanomethanides and tetracyanopropenides were prepared from the chlorides and iodides by anion metathesis. The reaction of guanidinium halogenides with borontrifluoride etherate, triethyloxonium tetrafluoroborate or sodiumtetrafluoroborate delivers guanidinium tetrafluoroborates. Guanidinium saccharinides, cyanates, thiocyanates, trifluoromethansulfonates, bis(trifluormethansulfonyl)imides, hexacyanoferrates(II/III), tetracyanonickolates and tetrathiocyanatocobaltates were prepared from the corresponding guanidinium chlorides and tetrafluoroborates by anion exchange.

Orthoamide und Iminiumsalze, IC. Synthese und Reaktionen von N,N,N′,N′,N′′-Pentaalkyl-N′′-[2-(N,N,N′,N′,N′′-pentaalkylguanidinio)ethyl]-guanidiniumsalzen

Bis[bis(dibutylamino)methylen]hydrazine 8 is prepared from N,N,N′,N′-tetrabutylchloroformamidinium chloride (4c) and hydrazine. Bromine transforms 8 to the heterocyclic guanidinium salt 15a which is isolated as tetraphenylborate. From N,N,N′,N′-tetraalkylchloroformamidiniumchlorides and ethylendiamine the diguanidines are prepared which are alkylated to give diguanidinium salts, From these salts guanidinium salts can be prepared by anion metathesis with tetraphenylborate-, iodide-, hexafluorphosphate-, trifluoromethansulfonat-, bis(trifluormethansulfonyl)imide and tricyanmethanide as counteranions. The structure of the compounds 15 and 17b is confirmed by crystal structure analyses.

Orthoamide und Iminiumsalze, XCII. Synthese und Reaktionen von Orthoamiden aus ethinylierten Terpenderivatena

β-Ionone and camphor were ethynylated to give the alkynols 14, 16, 17 which can be transformed to the alkynolethers 5b, 5i, 5j, 5k, 5l, 5m by treatment with dimethylsulfate and chlorotrimethylsilane, respectively. From the alkynolethers 5h, 5i, 5j/5k, 5l/5m the orthoamide derivatives 4h, 4i, 4j/4k, 4l/4m can be prepared by treatment with N,N,N′,N′,N″,N″-hexamethylguanidinium chloride (8) in the presence of sodium hydride. The orthoamides 4h, 4i react with the sulfonamide 30 under condensation yielding the N-sulfonylated acrylamidines 31, 32. From the orthoamide 4h and p-nitroaniline the propiolamidine 29 could be obtained. The orthoamides 4j/4k and 4l/4m, react with benzamidine to give the pyrimidines 33, 34, respectively. In the reaction of malonodinitrile (9a) with the orthoamides 4i and 4j/4k, mixtures of 1,1-diamino-1,3-butadienes 36, 38 and 1,3-diamino-1,3-butadienes 37 and 39 are produced, respectively. From CH2-acidic compounds as ethylcyanacetate (9b), diethyl-malonate (9c) and nitromethane (9d) and the orthoamide 4i the 1,1-diamino-1,3-butadienes 36b–d were produced. The pyridone derivative 40 can be prepared from cyanoacetamide (9e) and the orthoamide 4i. The condensation of the orthoamides 4j/4k with cyanoacetamide (9e) affords a mixture of the pyrimidone 41 and the nicotinonitrile 42.