Synthesis and characterization of a new series of iron(II) single-face hindered porphyrins. Influence of central steric hindrance upon carbon monoxide and oxygen binding

1987 ◽  
pp. 249 ◽  
Author(s):  
Michel Momenteau ◽  
Bernard Loock ◽  
Catherine Tetreau ◽  
Daniel Lavalette ◽  
Alain Croisy ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Steric Hindrance ◽  
Synthesis And Characterization ◽  
Oxygen Binding ◽  
Single Face

Synthesis and characterization of polyketoximes derived from alkene-carbon monoxide copolymers

1996 ◽  
Vol 32 (11) ◽  
pp. 1285-1288 ◽  
Author(s):  
Shui-Yu Lu ◽  
R.Michael Paton ◽  
Michael J. Green ◽  
Andrew R. Lucy
Keyword(s):  
Carbon Monoxide ◽  
Synthesis And Characterization

scholarly journals Palladium PEPPSI-IPr Complex Supported on a Calix[8]arene: A New Catalyst for Efficient Suzuki–Miyaura Coupling of Aryl Chlorides

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1081
Author(s):  
Axel Labattut ◽  
Ibrahim Abdellah ◽  
Julien Buendia ◽  
Sandra Abi Fayssal ◽  
Erika Adhel ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
High Reactivity ◽  
Synthesis And Characterization ◽  
Metal Leaching ◽  
Great Promise ◽  
Aryl Chlorides ◽  
Mild Conditions ◽  
Rare Combination

We report here the synthesis and characterization of a new calix[8]arene-supported PEPPSI-IPr Pd polymetallic complex. This complex, showing greater steric hindrance around the Pd centers compared with previous calix[8]arene-based catalysts, demonstrated high reactivity and selectivity for the Suzuki–Miyaura coupling of aryl chlorides under mild conditions. Along with this good performance, the new catalyst showed low Pd leaching into the final Suzuki–Miyaura coupling products, indicative of a heterogeneous-type reactivity. This rare combination of good reactivity towards challenging substrates and low metal leaching offers great promise at both academic and industrial levels.

scholarly journals Electrophilic oligodeoxynucleotide synthesis using dM-Dmoc for amino protection

2019 ◽  
Vol 15 ◽  
pp. 1116-1128 ◽  
Author(s):  
Shahien Shahsavari ◽  
Dhananjani N A M Eriyagama ◽  
Bhaskar Halami ◽  
Vagarshak Begoyan ◽  
Marina Tanasova ◽  
...  
Keyword(s):  
Michael Addition ◽  
Steric Hindrance ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Side Product ◽  
Synthesis And Characterization ◽  
Protecting Group ◽  
Phase Synthesis ◽  
Improved Technology

Solid-phase synthesis of electrophilic oligodeoxynucleotides (ODNs) was achieved using dimethyl-Dmoc (dM-Dmoc) as amino protecting group. Due to the high steric hindrance of the 2-(propan-2-ylidene)-1,3-dithiane side product from deprotection, the use of excess nucleophilic scavengers such as aniline to prevent Michael addition of the side product to the deprotected ODN during ODN cleavage and deprotection was no longer needed. The improved technology was demonstrated by the synthesis and characterization of five ODNs including three modified ones. The modified ODNs contained the electrophilic groups ethyl ester, α-chloroamide, and thioester. Using the technology, the sensitive groups can be installed at any location within the ODN sequences without using any sequence- or functionality-specific conditions and procedures.

Titanocene derivatives of purine and adenine. Synthesis and characterization of reaction products with (η5-C5H5)2Ti(CO)2, (η5-C5H5)2TiCl, and (η5-C5H5)2TiCl2

1986 ◽  
Vol 64 (4) ◽  
pp. 751-759 ◽  
Author(s):  
Daniel Cozak ◽  
Abdelhakim Mardhy ◽  
André Morneau
Keyword(s):  
Carbon Monoxide ◽  
Metal Complex ◽  
Elemental Analysis ◽  
Synthesis And Characterization ◽  
Reaction Products ◽  
First Order ◽  
H Nmr ◽  
New Compounds ◽  
Derivatives Of

The reaction of CpTi(CO)2 (1), Cp2TiCl (2), and Cp2TiCl2 (3) (Cp = η5-C5H5) with purine (PuH) and adenine (AdH) in organic solvents is described. The compound 1 reacts with both molecules in an oxidative fashion giving Cp2Ti(C5H3N4)(C5H4N4) (4) and (Cp2Ti)2(C5H3N5) (5) with concomitant liberation of molecular carbon monoxide and hydrogen (4:1) following a first order rate law in metal complex. The compound 2 forms an adduct compound Cp2TiCl(C5H4N4) (6) with PuH. Monosubstituted derivatives Cp2TiCl(C5H3N4) (7) and Cp2TiCl(C5H4N5) (8) are formed from the reaction of the deprotonated bases with 3. In addition to the usual elemental analysis, the characteristic ir, 1H nmr, epr, and ms results are given for the new compounds.

Synthesis and characterization of branched copolysilanes of high molecular weight with high steric hindrance

2002 ◽  
Vol 38 (8) ◽  
pp. 1635-1643 ◽  
Author(s):  
Zhijian Peng ◽  
Wenjie Si ◽  
Shiwei Lin ◽  
Hezhuo Miao ◽  
Hejian Fu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Steric Hindrance ◽  
Synthesis And Characterization
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