t-Boc protected poly(p-hydroxystyrene-alt-carbon monoxide): a new class of deep-UV resists

1995 ◽  
Author(s):  
M. S. Brookhart ◽  
Joseph M. DeSimone ◽  
Robert E. Johnson ◽  
Shonali Tahiliani
Keyword(s):  
Carbon Monoxide ◽  
New Class ◽  
Deep Uv

scholarly journals New Class of Hybrid Materials for Detection, Capture, and “On-Demand” Release of Carbon Monoxide

2018 ◽  
Vol 10 (16) ◽  
pp. 13693-13701 ◽  
Author(s):  
Anaïs Pitto-Barry ◽  
Alexandru Lupan ◽  
Christopher Ellingford ◽  
Amr A. A. Attia ◽  
Nicolas P. E. Barry
Keyword(s):  
Carbon Monoxide ◽  
Hybrid Materials ◽  
New Class ◽  
On Demand

Palladium-catalyzed alternating copolymerization of carbon monoxide with olefins bearing carbamate and amide functionalities

2001 ◽  
Vol 79 (5-6) ◽  
pp. 587-592 ◽  
Author(s):  
Christophe Moineau ◽  
Giuseppe Mele ◽  
Howard Alper
Keyword(s):  
Carbon Monoxide ◽  
Optically Active ◽  
New Class ◽  
Palladium Catalyzed ◽  
Alternating Copolymerization

The copolymerization of carbon monoxide with different olefins bearing carbamate and amide functionalities was effected using [Pd(CH3CN)4](BF4)2 as the catalyst and (R,R)-Me-DUPHOS (2:1 (v/v) MeNO2–MeOH or CH2Cl2 as the solvent). The products constitute a new class of functionalized copolymers, and were found to be optically active with a mixture of 1,4-ketone and spiroketal repeating units in the backbone. The influence of different parameters on the copolymerization of methyl N-(3-butenyl)carbamate with carbon monoxide was examined.Key words: copolymerization, carbon monoxide, olefins bearing carbamate and amide functionalities.

Reductive Amination of Ethylene/Carbon Monoxide Polyketones. A New Class of Polyamines

1954 ◽  
Vol 76 (24) ◽  
pp. 6394-6399 ◽  
Author(s):  
D. D. Coffman ◽  
H. H. Hoehn ◽  
J. T. Maynard
Keyword(s):  
Carbon Monoxide ◽  
Reductive Amination ◽  
New Class

scholarly journals A Stereoselective, Multicomponent Catalytic Carbonylative Approach to a New Class of α,β-Unsaturated γ-Lactam Derivatives

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 227
Author(s):  
Raffaella Mancuso ◽  
Ida Ziccarelli ◽  
Matteo Brindisi ◽  
Cosimo D. Altomare ◽  
Luca Frattaruolo ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Biological Activity ◽  
Catalytic System ◽  
Building Blocks ◽  
New Class ◽  
Potential Biological Activity

We report a stereoselective, multicomponent catalytic carbonylative approach to a new class of α,β-unsaturated γ-lactam derivatives with potential biological activity, that are, alkyl (Z)-2-(2-oxopyrrolidin-3-ylidene)acetates. Our method is based on the catalytic assembly of readily available building blocks, namely, homopropargylic amines, carbon monoxide, an alcohol, and oxygen (from air). These simple substrates are efficiently activated in ordered sequence under the action of a very simple catalytic system, consisting of PdI2 in conjunction with KI to give the γ-lactam products in 47–85% yields. Carbonylation reactions are carried out at 100 °C for 2–5 h under 40 atm of a 4:1 mixture of CO‒air, with 0.5–5 mol% of PdI2 and 5–50 mol% of KI.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

The microtubule associated protein (MAP) tau forms a new class of triple-stranded left-hand helical fibrous protein polymer

1992 ◽  
Vol 50 (1) ◽  
pp. 540-541
Author(s):  
G. C. Ruben ◽  
K. Iqbal ◽  
I. Grundke-Iqbal ◽  
H. Wisniewski ◽  
T. L. Ciardelli ◽  
...  
Keyword(s):  
Axial Ratio ◽  
Normal Structure ◽  
Paired Helical Filaments ◽  
Left Hand ◽  
New Class ◽  
Protein Polymer ◽  
Fibrous Protein ◽  
Protein Map ◽  
Neurotransmitter Transport ◽  
Alzheimer Neurofibrillary Tangles

In neurons, the microtubule associated protein, tau, is found in the axons. Tau stabilizes the microtubules required for neurotransmitter transport to the axonal terminal. Since tau has been found in both Alzheimer neurofibrillary tangles (NFT) and in paired helical filaments (PHF), the study of tau's normal structure had to preceed TEM studies of NFT and PHF. The structure of tau was first studied by ultracentrifugation. This work suggested that it was a rod shaped molecule with an axial ratio of 20:1. More recently, paraciystals of phosphorylated and nonphosphoiylated tau have been reported. Phosphorylated tau was 90-95 nm in length and 3-6 nm in diameter where as nonphosphorylated tau was 69-75 nm in length. A shorter length of 30 nm was reported for undamaged tau indicating that it is an extremely flexible molecule. Tau was also studied in relation to microtubules, and its length was found to be 56.1±14.1 nm.

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