351 research outputs found
Recommended from our members
The attitudes of the American business community to the Soviet Union, 1917-1933.
Investigation and examination of some American attitudes to the Soviet Union, like all attitudinal studies, pose severe problems for the historian. First, it is difficult to identify members of the business and banking community in any detail, because of the anonimity of much of the source material. It is also difficult to determine how representative were the viev;s expressed, or if certain groups of businessmen preferred one kind of action to another. Even Profesbor Filene, by analyzing the opinions and attitudes only of those who made their views known does not solve the identity problem.^ Many views on the Soviet Union were anonymously expressed or reported in a 2 business paper like the V/9,11 Street Journal * making it hard to determine whether these were the opinions of the reporter, editor or editorial board. How many of the newspaper\u27s readers shared these views? Were the readers all businessmen? These remain insoluble problems for the present, since it has been impossible to locate distributJ.on figures for the Journa
Recommended from our members
No land too remote : women travellers in the Georgian Age, 1750-1830.
The Enantioselective Tsuji Allylation
The first catalytic enantioselective examples of the Tsuji allylation using enol carbonates and enol silanes are described. The products possess a quaternary stereogenic center and are useful building blocks for synthetic chemistry
Catalytic Enantioselective Decarboxylative Protonation
We report a highly enantioselective, general catalytic system for the facile synthesis of tertiary stereocenters by protonation adjacent to cyclic ketones. The method relies on catalytic decarboxylative protonation of readily accessible racemic quaternary β-ketoesters. A range of substituted cycloalkanone compounds can be accessed through this process with high levels of enantioselectivity
A Facile and Modular Synthesis of Phosphinooxazoline Ligands
The copper(I) iodide catalyzed phosphine/aryl halide coupling procedure of Buchwald et al. provides modular, robust, and scaleable access to phosphinooxazoline (PHOX) ligands. The advantages of this method are highlighted by the convenient synthesis of PHOX ligands with varied steric and electronic properties, which would be challenging to synthesize by other protocols
Enantioselective Synthesis of Caprolactam and Enone Precursors to the Heterocyclic DEFG Ring System of Zoanthenol
The enantioselective synthesis of both caprolactam and enone synthons for the DEFG ring system of zoanthenol are described. The evolution of this approach proceeds first through a synthesis using the chiral pool as a starting point. Challenges in protecting-group strategy led to the modification of this approach beginning with (±)-glycidol. Ultimately, an efficient approach was developed by employing an asymmetric hetero-Diels–Alder reaction. The caprolactam building block can be converted by an interesting selective Grignard addition into the corresponding enone synthon. Addition of a model alkyne provides support for the late-stage addition of a hindered alkyne to the caprolactam building block
The Enantioselective Tsuji Allylation
The first catalytic enantioselective examples of the Tsuji allylation using enol carbonates and enol silanes are described. The products possess a quaternary stereogenic center and are useful building blocks for synthetic chemistry
The Enantioselective Tsuji Allylation
The first catalytic enantioselective examples of the Tsuji allylation using enol carbonates and enol silanes are described. The products possess a quaternary stereogenic center and are useful building blocks for synthetic chemistry
- …