The 2,3-dihydro-l,3-di(methoxyalkyl)imidazol-2-ylidenes are obtained from the correspon ding cyclic thioureas and potassium. With CS2, the imidazolium dithiocarboxylates are formed. The results of X-ray structure determinations of two of these products are reported.
2,3-Dihydro-1,3-di-3'-methoxypropyl-4,5-dimethylimidazol-2-ylidene (2, Carb) reacts with Pd(MeCO2)2 or Me2SnCl2 to give the complexes (Carb)2Pd(MeCO2)2 (5) and (Carb)SnMe2Cl2 (6), respectively. The X-ray structure analysis of 5 clearly demonstrates the η1-coordination of the carbene ligand in the solid state while NMR data imply a weak Pd-O interaction in solution. In 6, the X-ray structure analysis reveals Sn-O distances close to the sum of the van der Waals-radii.
The 1,3-dialkyl-5-hydroxy-2-thioxoimidazolidin-4-ones 8 (R = Me, Et, iPr) were obtained from the corresponding thiourea and glyoxylic acid monohydrate in very good yield. Their reactions with chlorotrimethylsilane in the presence of triethylamine gave the 1,3-dialkyl-5-trimethylsiloxy-2-thioxoimidazolidin- 4-ones 9. NMR and crystal structure data of 1,3-diisopropyl-5-hydroxy-4-thioxoimidazolidin-4-one (8c) have confirmed the acyloin-type structure of the above mentioned compounds.
The α-diketodiimides C10H20N2O2 (2a) and C12H24N2O 2 (2b) are prepared by reacting butane- 2,3-dione with the corresponding α,ϖ-amino- (methoxy)alkanes (1); the X-ray structure of 2a is reported
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