DirectcatalyticasymmetricMannich-typereaction of a trichloromethyl ketone as a propionate equivalent donor is described. A new lanthanum aryloxide−iPr-pybox + lithium aryloxide combined catalyst was the most effective, promoting the reaction of N-2-thiophenesulfonyl imines with the trichloromethyl ketone. syn-Mannich adducts were obtained from various aryl, heteroaryl, alkenyl, and alkyl imines
Trihalogenomethyl compounds of potential therapeutic interest. Part VI. Some alcohols with sedative action, and their esters
作者:D. C. Bishop、S. C. R. Meacock、W. R. N. Williamson
DOI:10.1039/j39660000670
日期:——
A series of alcohols, Cl3C·CRR′·OH, and a number of basic, neutral, and acidic esters of some of them, have been prepared.
已经制备了一系列的醇,Cl 3 C·CRR'·OH,以及其中的一些碱性,中性和酸性酯。
Rearrangements of Trihalomethyl Ketones
作者:Samuel Braverman、Marina Cherkinsky、E.V.K Suresh Kumar、Hugo E Gottlieb
DOI:10.1016/s0040-4020(00)00360-4
日期:2000.6
competition between 1,2- vs. 1,3-elimination and nucleophilic substitution. Favorskiirearrangement was the preferred process, but in those cases where electronic or steric effects were present, nucleophilic substitution became dominant. No evidence of ketene formation was detected. The mechanism of formation of the various rearrangement products is discussed.
A ruthenium complex RuCl[(S,S)-Tsdpen](p-cymene) represented by a formula below and a ketone compound are placed in a polar solvent, and the resulting mixture is mixed under pressurized hydrogen to hydrogenate the ketone compound and to thereby produce an optically active alcohol:
METAL CATALYST FOR RING-OPENING POLYMERIZATION OF HETEROCYCLIC COMPOUND
申请人:SANYO CHEMICAL INDUSTRIES, LTD.
公开号:EP1340780A1
公开(公告)日:2003-09-03
The object of the present invention is to provide a metal catalyst which allows the production of a ring-opened polymer available from a heterocyclic compound, having primary terminal heteroatomic groups (terminal hydroxyl groups, in particular) in a ratio exceeding 75%.
The above object can be attained by using a metal catalyst comprising a ligand and a metal atom for ring-opening polymerization of heterocyclic compounds
in which, of all maximum angles (D) meeting the following definition, the smallest maximum angle (Dm) is not larger than 60 degrees;
The maximum angle (D) is the largest angle between an imaginary line (X) and an imaginary line (Y) of all the angles which can be assumed in a metal catalyst comprising a ligand and a metal atom,
said imaginary line (X) means a line perpendicular to an imaginary plane (P) including the respective centers of 3 coordinating atoms among those directly coordinating the metal atom (M) and not substitutable by a reaction substrate (S) and passing through the center of the metal atom,
said imaginary line (Y) means a line linking the center of a non-coordinating atom in the ligand and the center of the metal atom,
and said maximum angle (D) exists in a number equal to the number of non-coordinating atoms, that is, the number of imaginary lines (Y).