The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2 ) is researched.Name: Tris(triphenylphosphine)chlororhodium.Chen, Dou; Mo, Gaoming; Qian, Junmin; He, Liu; Huang, Qing; Huang, Zhengren published the article 《Synthesis of cyano-polycarbosilane and investigation of its pyrolysis process》 about this compound( cas:14694-95-2 ) in Journal of the European Ceramic Society. Keywords: cyano polycarbosilane pyrolysis process. Let’s learn more about this compound (cas:14694-95-2).
Polycarbonsilane (PCS) is an important precursor of silicon carbide (SiC) fibers and ceramics. The ceramic yield of PCS is relatively low, about 60 %, which may bring some deficiencies in its applications. In this work, a novel precursor cyano-polycarbosilane (PCSCN) is synthesized by hydrosilylation reaction between PCS and acrylonitrile using a rhodium-containing catalyst, although acrylonitrile is generally not easy for hydrosilylation. After introducing tiny amounts of cyano (-CN) groups into the PCS mols., the ceramic yield of PCSCN can increase largely to over 80 %. The ceramization mechanism of PCSCN is investigated by FTIR, TG, XPS, ESR, NMR, Raman and XRD analyses. It is found that some crosslinking structures in PCSCN are formed between Si-H bonds and -C[n.58118]N groups from about 200 °C, which can be responsible for the high ceramic yield. The existence of a little more N, O and free C elements in the pyrolysis products may inhibit the growth of crystalline β-SiC. Moreover, the PCSCN precursor can also be melt-spun into continuous fibers by tailoring its mol. weight and softening point. The oxidized PCSCN fiber with relatively low oxygen content can be pyrolyzed without melting, and the final SiC fiber with an oxygen content as low as 8.5 % is obtained.
In some applications, this compound(14694-95-2)Name: Tris(triphenylphosphine)chlororhodium is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.
Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate