β Scribed by A Saxena; F Huber; L Pellerito; A Girasolo
No coin nor oath required. For personal study only.
Some organo-Main-Group-IV-element compounds of steroids of the type R,M(COL), R,Sn(COL), and (R,M),(HDCA) (where R = M e or Ph; M=Si, Sn and Pb; HCOL = cholest-5-en-3fi-01; H,DCA = 3x,l2a-dihydroxy-5fi-cholan-24-oic acid), have been synthesized. The structures of these compounds have been investigated by vibrational, mass, NMR (lH, 13C, "Si, '19Sn and 207Pb) and It9Sn Mossbauer spectroscopy. For Me,Sn(COL) both in solution and in the solid state an associated structure with distorted trigonal bipyramidal geometry around tin and three-coordinated oxygen atoms is postulated. Discrete tetrahedral geometries are assigned to Ph,M(COL) complexes and to R,Sn(COL)2 complexes in solution. The latter compounds probably have an associated distorted trigonal bipyramidal structure in the solid state. The complexes (Ph,M),(HDCA) also have tetrahedral geometries around the central atoms M in solution, but for (Ph,Sn),(HDCA) a polymeric structure with both tin atoms pentacoordinated in the solid state is proposed.
π SIMILAR VOLUMES
It is well known that the proteins consist of over twenty u-amino acids. However, many w-amino acids or w-amino sulfonic acids have been isolated from various sources of the animals and plants. Numerous investigations have been pointed to accumulate data as to the metabolic pathway or the knowledg