Molbank

In this report, we describe the synthesis and full spectroscopic characterization of a previously unreported podophyllotoxin (PTOX) analogue bearing a second 3,4,5-trimethoxyphenyl (TMP) unit at the C-4 position through an ester linkage. This dual-TMP PTOX derivative is obtained from a brominated PTOX intermediate. In this precursor, the bromine atom is located on the TMP aromatic ring at the 2′-position. The new compound was fully characterized by proton (¹H), carbon-13 (¹³C), heteronuclear single-quantum coherence (HSQC), and distortionless enhancement by polarization transfer (DEPT) NMR spectroscopy. Ultraviolet–visible (UV-Vis) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, mass spectrometry and elemental analysis were also performed to confirm the structure and purity of the synthesized ester derivative.

Peri-substituted bis(tertiary) phosphine-arsine Acenap(PiPr₂)(As(SPh)Ph) (4, Acenap = acenaphthene-5,6-diyl) was synthesized by the reaction of the chloroarsine (PiPr₂)(AsPhCl) with PhSLi. The X-ray crystal structure of this compound reveals an intramolecular P∙∙∙As–Cl pnictogen bond, with the phosphorus lone pair donating into the As–S σ* orbital.

Vinylimidazolium salts constitute a highly relevant class of polymerizable heterocycles, especially in the field of so-called polymer ionic liquids (PILs), and they are frequently used as components of polyelectrolytes. Therefore, crystallographic characterizations, in particular studies of charge distribution and conformational features, can provide fundamental insights concerning ion–ion and ion–dipole interactions. The structure of the title compound [1046127-79-0] has the space group symmetry P2₁/c. Its asymmetric unit contains one formula unit, consisting of two bromide anions and the halves of two cation moieties. The cation units possess inversion symmetry, and their C₆H₁₂ chains adopt an all-trans conformation.