Narongsak Chaichit

Weak intramolecular π coordination to methylmercury(II). Structure of (2-benzylpyridine)methylmercury(II) nitrate

The title complex, [Hg(CH3)(C12HllN)]N03,C13HI4HgN+.N03-, has a linear C-Hg-N group with Hg-C 2·07(3) and Hg-N 2·10(2) A; there is a weak intramolecular pi interaction between Hg and a C=C bond of the phenyl ring with Hg-C distances of 3·23(2) and 3·33(3) A.

Meerwein–Ponndorf–Verley reaction of α-ketoepoxides. A stereocontrolled one-step synthesis of epoxy-1,3-diol monoesters

Lithium enolate 3, derived from ketoepoxide 1, adds to two molecules of an aldehyde with concomitant hydride transfer to produce 5 stereospecifically.

Organometallic Compounds Containing a Guanidinium Group. Crystal and Molecular Structure of (Creatinine)phenylmercury(II) Nitrate Monohydrate

We have determined the structure of [PhHg(C4H7N30)][N03].H20. The crystal is made up of [PhHgNC(NH2)(Me)CH2CO]+ cations containing the phenylmercury group bonded to the ring N atom, nitrate ions, and water molecules. The creatinine and phenyl rings in the cation are almost coplanar, and the cations are stacked with phenyl and creatinine rings of adjacent ions almost parallel and 3·372 A apart. Bond lengths within the creatinine ring indicate delocalization of the carbonyl C(1)O with the guanidinium moiety as the C(1)-N(3) distance, 1·38 (4) A, is appropriate for multiple-bond character.

Synthesis and X-ray crystal structure of fruticosonine, a novel indole alkaloid from a New Zealand Aristotelia sp. (elaeocarpaceae)

The structure of fruticosonine, a new type of indole alkaloid from A. fruticosa, has been determined by X-ray crystallography and by synthesis.

Synthesis and structure of methylmercury(II) complexes of 9-methylguanine, including the X-ray structural analysis of (9-methylguanine)-methylmercury(II) nitrate

Methylmercury(II) nitrate reacts with 9-methylguanine (9-MeGua) in water to form solid complexes of stoicheiometry [HgMe(9-MeGuaH–1)], [HgMe(9-MeGua)][NO3], [HgMe(9-MeGua)][NO3]·H2O, and [(HgMe)2(9-MeGuaH–1)][NO3]. Comparison of i.r. spectra of the solid complexes and 1H n.m.r. spectra of [2H6]dimethyl sulphoxide-soluble (ionic) complexes with spectra of analogous guanosine (Guo) complexes indicates that complexes of 9-MeGua and Guo with similar stoicheiometry have the same mode of binding of HgIIMe to the purine ring. The spectra indicate that [HgMe(9-MeGuaH–1)] and [(HgMe)2(9-MeGuaH–1)][NO3] have HgIIMe bonded to N(1) and both N(1) and N(7), respectively, and the complexes [HgMe(9-MeGua)][NO3] and [HgMe(9-MeGua)][NO3]·H2O have HgIIMe bonded to N(7) with retention of a proton at N(1). Crystals of [HgMe(9-MeGua)][NO3] are monoclinic, with a= 4.196(1), b= 15.060(4), c= 18.288(5)A, β= 90.17(2)°, Z= 4, and space group P21/c. The structure has been solved by conventional Patterson and Fourier methods and refined by least-squares techniques to R 0.061 for 1 152 reflections collected by diffractometer. The complex has HgIIMe bound to N(7) with Hg–C 2.06(2), Hg–N(7) 2.09(2)A, and C–Hg–N(7) 175(1)°. Mercury interacts weakly with nearby nitrate ions, with Hg ⋯ 0 2.75(2) and 2.99(2)A; the purine ring is planar with the HgIIMe group slightly tilted from this plane, Hg being –0.168(1) and the carbon atom –0.411(25)A from the plane.