Abstract
The reaction of dppm (1,1-bis(diphenylphosphino)methane) with
2-bromo-4-phenylacetophenone and benzyl bromoacetate in chloroform
produces new phosphonium salts, Ph2PCH2PPh2CH2C(O) C6H4PhBr (I) and
Ph2PCH2PPh2CH2COOCH2PhBr (II). By allowing the phosphonium salts to
react with the appropriate base, the bidentate phosphorus ylides,
Ph2PCH2PPh2=C(H)C(O)C6H4Ph (III) and Ph2PCH2PPh2=C(H)C(O)OCH2Ph (IV),
were obtained. The reaction of these ligands with mercury(II) halides in
dry methanol led to the formation of the mononuclear complexes
\HgX2(Ph2PCH2PPh2C(H)C(O)C6H4Ph)\ (X = Cl (V); X = Br (VI); X = I
(VII)) and \HgX2(Ph2PCH2PPh2C(H)COOCH2Ph)\ (X = Cl (VIII); X = Br
(IX); X = I (X)). The FTIR and H-1, P-31 and C-13 NMR spectra were
studied. The structure of compound III was unequivocally determined by
the single-crystal X-ray diffraction technique. Single-crystal X-ray
analysis of the \HgBr2(Ph2PCH2PPh2C(H)C(O)C6H4Me)\ complex (XI)
revealed the presence of a mononuclear complex containing the Hg atom in
a distorted tetrahedral environment. In all complexes, the ylides
referred to above were coordinated through the ylidic carbon and the
phosphine atom. (C) 2013 Institute of Chemistry, Slovak Academy of
Sciences
Users
Please
log in to take part in the discussion (add own reviews or comments).