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Amino acid derivatives bearing an alkyne (AA-CCH) at either the N- or C-terminus readily react with W(CO)3(S2CNMe2)2 to replace the carbon monoxides and form the novel bis-alkyne complexes W(AA-CCH)2(S2CNMe2)2; the solution behavior of these complexes shows that only the alkyne, and not the other functional groups on the amino acid, bonds to the tungsten.

Abstract.: In the treatment of aesthetic deformities of the abdomen there are three points we should analyze: the skin, the fat tissue, and the muscles. Based on these points we can classify it into six groups. Midiabdominoplasty is indicated in the correction of deformities of groups 2, 3, and 4. A small fusiform resection of skin is done in the lower abdomen, undermining of the skin up to the umbilicus (or to the xiphoid appendix if necessary to treat diastasis of the rectus muscles in the supraumbilical region), and desinsertion of the umbilicus, with no external scar, are the main points in this technique. The main complication was the formation of seroma. No necrosis of the flap or unsightly scars were observed. The results were good, with the patients satisfied with their new abdomens.