1998
DOI: 10.1039/a805548c
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Synthesis of some very bulky N,N′-disubstituted amidines and initial studies of their coordination chemistry †

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Cited by 115 publications
(172 citation statements)
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“…The largest lanthanum complex 2-La showed the highest activity. THF seemed to be a better solvent than benzene or toluene for this reaction ( Table 2, entries [10][11][12]. Thus, in the presence of 1 mol % of 2-La, the reaction of Ph 2 PH with iPrN=C=NiPr in THF at 80 8C yielded the corresponding phosphaguanidine 3 a quantitatively within 1 h ( Table 2, entry 13).…”
Section: Resultsmentioning
confidence: 91%
“…The largest lanthanum complex 2-La showed the highest activity. THF seemed to be a better solvent than benzene or toluene for this reaction ( Table 2, entries [10][11][12]. Thus, in the presence of 1 mol % of 2-La, the reaction of Ph 2 PH with iPrN=C=NiPr in THF at 80 8C yielded the corresponding phosphaguanidine 3 a quantitatively within 1 h ( Table 2, entry 13).…”
Section: Resultsmentioning
confidence: 91%
“…In other work [11b] we found that iminoyl chlorides 1 [17] are very convenient and useful electrophilic reagents which react quantitatively with N-H nucleophiles. They also convert imidazole and benzimidazole to the corresponding Niminoyl heterocycles 2a and 2b in very good yield.…”
mentioning
confidence: 99%
“…Interestingly, although not unprecedented for guanidines or amidines, [13] the crystal structure of uncoordinated hppH reveals the presence of dimers that interact strongly through NH···N contacts, which results in a disorder of the NH atoms over two positions and a delocalised binding situation. [14] As a consequence, the C1-N1 and C1-N2 bond lengths (see Scheme 2 for the atom numbering) in crystalline hppH are almost equal (133.1 and 132.8 pm), whereas C1-N3 is significantly longer (136.7 pm).…”
Section: Cis-[(nhmentioning
confidence: 97%
“…13 [24] (71 mg, 0.168 mmol) and hppH (72 mg, 0.518 mmol) were dissolved in 15 mL of CH 2 Cl 2 . The resulting pale-yellow solution was stirred at room temperature for 20 h. The solvent was then removed in vacuo, and the pale-yellow oily residue was washed two or three times with toluene and filtered through a 1-cm silica frit.…”
mentioning
confidence: 99%