We then found that by using the more electron-deficient NHC pre-catalyst E, the products (3o–3q) could be obtained with good to excellent enantiomeric excesses. It appears that the electronic properties of both the imine substrates and NHC catalysts could significantly affect the enantioselec- ...
3). First, we tested ketones with primary and tertiary α-carbons (Fig. 3a). Because of the alkyl/alkyl steric repulsion on the same side of the more-substituted enolates of such ketones, less-substituted enolate is both kinetically and thermodynamically favored over more-substituted enolate. ...
Two novel poly (aryl ether ketone)s with anthracene moieties in the backbone were synthesized through the conventional nucleophilic aromatic substitution polycondensation for the first time, by using a new bisfluoro monomer, 9,10-bis(4-fluorobenzoyl) ant
If iodine reacts with a methyl ketone, iodoform, CHI3, forms. It is a bright yellow, insoluble solid. Under basic conditions, the carboxylic acid product shown exists as an anion. However, after neutralization in the workup of the reaction mixture, the products are a carboxylic acid and C...
R 3 and R 5 may be linked to constitute an alicyclic ring having a maximum of 8 carbon atoms, which ring may be substituted by an alkyl or alkylidene group having up to four carbons, a benzylidene or a benzyl group; and X and Y are each the same or different and are hydrogen, low...
What alkene would give only a ketone with three carbons as a product of oxidative cleavage? How will you use a Grignard addition reaction to prepare the given alcohol from an aldehyde or ketone? Deduce the IUPAC name of the alkyne. Show how 1-pentanol can be prepared from an alkene. Show...
(3) Excellent hydrolytic stability. (For example, PEK has very good resistance to hot water at 125°C, under which conditions other heat-resisting plastics such as the polyimides are liable to fail.) (4) Good radiation resistance with no significant degradation below 1100 Mrad. (5) Very good...
The novel process for preparation of the diarylmethanol 3 comprises reacting an N-carboxyanhydride 2 with an aryl Grignard reagent: ##STR9## wherein n is 1 or 2; R1and R2independently represent hydrogen, C1-3 alkyl or joined together represent with the carbons to which they are attached a...
MCTs can have different carbon lengths and this can slightly dictate how ketogenic they are; MCTs with 8 carbons (C8) are 3 times more ketogenic than a 10-carbon MCT and about 6 times more ketogenic than a 12-carbon MCT.9 Coconut oil is a rich source of MCTs, but these precursors can...
(ether ketone)s functionalized with carboxylic acid terminal groups Ying Shi1, Yuta Nabae1, Teruaki Hayakawa1, Hirokazu Kobayashi2, Mizuho Yabushita2,3, Atsushi Fukuoka2 and Masa-aki Kakimoto1 A new type of hyperbranched aromatic poly(ether ketone) terminated with carboxylic acid groups (P2) was...