Synthesis of Tertiary Amines Using a Polystyrene (REM) Resin
作者:Angus R. Brown、David C. Rees、Zoran Rankovic、J. Richard Morphy
DOI:10.1021/ja963829f
日期:1997.4.1
tertiary amines was constructed using a “traceless” linker on a polystyrene resin (REM resin), starting from secondary amines, primary amines, and resin-bound “ammonia”. The methodology is characterized by three essential steps conducted under ambient conditions: (1) coupling of the starting amine (Michael addition) to the resin, (2) activation (quaternization), and (3) cleavage of the product amine (Hofmann
A chiral, organometallic compound which, at a molecular level, has no C2 symmetry and comprises a carbon to carbon bond joining a chiral carbon atom to a carbon atom of a cyclopentadiene ring that is non-symmetrically substituted. Examples of such compounds include compounds of formula (I): ##STR1## wherein X.sup.1 and X.sup.2 are, independently, groups which are removable during a chemical reaction; M is titanium, zirconium or hafnium; and R.sup.1-8,11 are as specified in the description.
(EN) A chiral, organometallic compound which, at a molecular level, has no C2 symmetry and comprises a carbon to carbon bond joining a chiral carbon atom to a carbon atom of a cyclopentadiene ring that is non-symmetrically substituted. Examples of such compounds include compounds of formula (I) wherein, X1 and X2 are, independently, groups which are removable during a chemical reaction; M is titanium, zirconium or hafnium; and R1-8,11 are as specified in the description.(FR) L'invention porte sur un composé organométallique, chiral, qui, à un niveau moléculaire, est asymétrique en C2 et comporte une liaison carbone-carbone liant un atome chiral de carbone à un atome de carbone d'un anneau de cyclopentadiène substitué de manière asymétrique. Au nombre de ces composés figurent des composés de la formule (I) dans laquelle X1 et X2 représentent, de façon indépendante, des groupes remplaçables au cours d'une réaction chimique; M est titane, zirconium ou hafnium et où R1-8,11 correspond à la définition donnée dans la description.