Macropolycycliccagecompounds were synthesized by a direct reaction between diamines and bis(bromomethyl) compounds. The procedure for constructing the polycyclic cage structure is simple and straightforward. The macropolycycliccompounds obtainable from this cyclization procedure are three-dimensional cagecompounds, and any other isomers were not obtained except for two examples. Benzene, pyridine
Synthesis of novel chiral quaternary phosphonium salts with a multiple hydrogen-bonding site, and their application to asymmetric phase-transfer alkylation
作者:Kei Manabe
DOI:10.1016/s0040-4020(98)00899-0
日期:1998.11
Chiral phosphonium salts having two NH and two OH groups as hydrogen-bond donors have been synthesized as novel phase-transfer catalysts, and used for asymmetric alkylation of β-keto esters to give the corresponding products with up to 50% ee.
NARROW EMISSION DYES, COMPOSITIONS COMPRISING SAME, AND METHODS FOR MAKING AND USING SAME
申请人:NIRvana Sciences Inc.
公开号:US20220249708A1
公开(公告)日:2022-08-11
Provided are bacteriochlorin derivatives with narrow band emission. In some embodiments, the bacteriochlorin derivatives are PEGylated. In some embodiments, the bacteriochlorin derivatives have high water solubility (e.g., 10 mg/mL or more). In some embodiments the bacteriochlorin derivatives are PEGylated and have high water solubility. The bacteriochlorin derivatives can include bioconjugatable groups for forming conjugates, for example, with antibodies and nanoparticles. The bacteriochlorin derivatives and their conjugates can be used in imaging and therapeutic applications. Methods of synthesizing the bacteriochlorin derivatives are also provided.
Dithiourea 1a self-assembles to form an orthogonal dimer structure both in solution and in the solid state, wherein the four thiourea groups establish a closed network of hydrogen bonds through a head-to-tail binding mode. This novel dimer structure was elucidated on the basis of H-1 NMR spectra, vapor pressure osmometry, and X-ray crystal structure analysis. Furthermore, a series of m-xylylene type dithioureas were synthesized and their dimerization constants (K-a) in CDCl3 were determined by dilution experiments using H-1 NMR spectroscopy. The magnitude of the K-a values are dependent on the steric bulk of the side chains, the acidity of the thiourea groups, and the weak intermolecular interaction between the benzene rings of the side chains and the m-xylylene spacer.